8 Speed torque converter shudder - fluid exchange and fix

Brief video showing automatic transmission fluid flush to change fluid type per bulletin.
Customer states shudder when accelerating
8L45 8L90 Sierra Silverado Colorado Canyon Camaro Corvette
#mechanic #cars #broken

[@pfsantos007]

Excellent video.

[@DadsGarageDiagnosticSpecialist]

Thank you very much!

[@bossjr5219]

I found your video with the exact same symptoms on my truck 2020 sierra 2500, bought it with 19k miles, now it has 117k miles and developed the same shudder as your video of the tcc right after the 110k miles. Changed the atf fluid and got some lucas oil fix. Trans pan looked the same, not to bad but it didn't last more than 500 miles and the shudder came back on. Im located in texas and would love to do the same thing to my truck. Where are you located and aprox how much it would cost to do this flush along with some overhaul work like spark plug change, coolant flush, brake flush. Not dissapointed with this gm trucks. I put 80k miles towing 8k pounds. Overcomfidence got me. Thanks. Keep up the good work

[@DadsGarageDiagnosticSpecialist]

Thanks for commenting boss jr This video is for a 1500 8 speed transmission, but the 6 speed also has some TCC issues too. However you said your truck is a 2500 so you either have a 10 speed 10L1000 transmission or a 6 speed 6L90....you mention spark plugs so I'll assume you have a 6 speed with gas engine. The 6L90 doesn't suffer from the TCC problems nearly as much as the 6L80 in the 1500 trucks and SUVs due to better lock-up programming. With the mileage and heavy towing for most of its life you're probably getting close to needing an overhaul on the transmission, but if the gears otherwise shift and hold ok and the fluid looked clean then a TCC failure can be confirmed with a professional scan tool, see 3:37 in the video for an example. I have actually had good success with fluid services to correct a TCC shudder on 6 speed transmissions when the fluid is dark and depleted, but not always. Sometimes the turbine shaft seal on the transmission shaft hardens and shrinks so you can end up with TCC apply problems when hot, I have had success replacing the torque converter and turbine shaft seal as well. It is really a case by case basis when it comes to transmission health.....again with the heavy towing for many miles I'd expect the transmission to need a light overhaul before a major failure which would save on the cost of parts replacements also. These days many shops replace the whole transmission unit because the unit comes with a better warranty.

[@tylerjones477]

its probably your axel torque converter shouldn't shudder or make any movement noises that's probably and axel or something with drive train if its awd

[@Dusty_Bottoms_]

Great video, I gotta figure out how to configure my HP tuners to show the graph like that. Thanks!

[@DadsGarageDiagnosticSpecialist]

Thanks!

[@juanprenteria5077]

Gread video👍 have a question to check the trans level temperature need to be in 194? There’s some videos out there that suggest to check the Trans level 88 to 114 f

[@DadsGarageDiagnosticSpecialist]

Specification is to check the fluid level between 95F-113F. Should also recheck fluid level after reaching 195F if equipped with a thermal bypass valve.

[@Mr.Corinthians]

I just bought a 2011 Cadillac CTS-4 (6 Speed AT) a few weeks ago and it seems I am having a similar problem. It runs and shifts fine for the first 20-30 minutes of driving, but then it shudders like in the video, sounding like I am driving over those speed strips on the side of a highway. I can also feel the shudder coming from somewhere just below and slightly behind the driver's seat. Sometimes it shifts a little hard between first, second and third, but is fine going into fourth through sixth gear. Using the Manual mode helps with that a bit, but the shudder is still there, if that makes sense. I have heard it could be the torque converter, but one mechanic also said it could be a bad transfer case. From what I have seen in some Cadillac forums online, there was a TSB put out for these cars recommending flushing the fluid and replacing with a fully synthetic type. Any additional suggestions would be appreciated.

[@DadsGarageDiagnosticSpecialist]

Yes the transmission fluid, a faulty torque converter, or a binding AWD transfer case clutch can cause a shuddering sensation under acceleration. If it shudders under heavy acceleration especially through turns the problem is more likely to be in the transfer case. It is easy to verify this with a scan tool by disabling the application of the transfer case clutch. The transfer case fluid being burned can also be a problem. More often what I find in a transfer case bind situation is the tires are worn unevenly and that is the true cause. Check the tire circumferences with a rolling test. Mark the tires in the same spot and roll forward 10 turns, all the marks should line up at the same spot, if not the problem is in the tires. Thanks.

[@perfetti1902]

hello. good video. I have some doubts. For a 2018 Silverado 8-speed transmission, how much oil is needed for the procedure? How many drain cycles are there? In each cycle do you have to wait for air to start coming out of the drainage duct? Is it necessary to change gears while the oil is draining? I would appreciate it if you could clarify those points for me. Thank you.

[@DadsGarageDiagnosticSpecialist]

The Silverado flush procedure takes 20 quarts of Mobil HP ATF. It usually takes three or four drain cycles… 4 quarts each until the fluid becomes clean… then you use the remaining fluid to top off the fluid level. You only need to set the fluid level carefully by temperature at the end of the process. Shifting in and out of reverse and drive multiple times might help a little, but the transmission is designed to backfill the clutches anytime the engine is running so the fluid will get flushed through no matter what. Thanks.

[@Mark-hs2js]

If you dont mind sharing, where did you get the flush adapter?

[@DadsGarageDiagnosticSpecialist]

Being at a GM dealer they are supplied through GMs tool website. Not sure if they are available anywhere else. Thanks.

[@Mark-hs2js]

Appreciate the response@@DadsGarageDiagnosticSpecialist

[@TimSatterfield-fb7kw]

I have a 2017 1500 Denali PU with the same issue. Dealer had it for a week. Finally said it was an E1 vibration issue but they did not know the cause. It seams you have found it. Many videos of folks having this issue and GM has no clue, that is odd to me. I did not see what fluid you changed to, just that it was updated. Can you advise what it should be? Also if this is such a common issue did GM use the wrong or bad fluid in these vehicles? If so shouldn't it be a recall issue? Thanks.

[@DadsGarageDiagnosticSpecialist]

The original fluid was Dexron 6 and as far as I know they had problems with the fluid absorbing moisture causing the shuddering to be much worse. So they changed to using Mobil 1 HP ATF which has different frictional qualities and helps to smooth out the torque converter application. The true cause of all these torque converter failures is emissions standards, they have to turn the torque converter clutch on and off a lot more than older vehicles used to, consequently the torque converter clutches wear out a lot faster. Thanks for commenting.

[@davidbryant9158]

There is a TSB for this problem. 19-NA-121 specifically for fluid change to mobile 1 blue fluid. it is covered under your powertrain warranty.@@DadsGarageDiagnosticSpecialist

[@glngib]

Mine is doing this now. Changed the battery thinking not getting enough power from a 5 yr old battery. Less than 30,000 miles since the last fluid change. 109,000 on 2014 GMC.

[@glngib]

No check engine lights.

[@DadsGarageDiagnosticSpecialist]

Over 100,000 miles… That is about when they start to get completely worn out. If the fluid was recently serviced then the torque converter and transmission is probably worn out. Thanks.

[@jcruz2010]

I have the same trans on my escalade 2017 8l90. The car now has 150k miles and it seems like the fluid was not change since the car had 40k miles . The fluid looks dark but i just have small vibration at 35-40mph and also a lil wining sound but the trans shift gears very nice. Do you think the full flush (mobil one hp blue+lube guard additives) may fix the problem? I just bought this suv at a good price also im trying to fix it before i buy a transmission.. thanks

[@DadsGarageDiagnosticSpecialist]

Yes it may help. I’d suggest replacing the transmission filter and inspect inside the fluid pan for signs of trouble first. Thank you for commenting.

[@jcruz2010]

@@DadsGarageDiagnosticSpecialist well i just came back from the dealer they did 19qt mobil hp fluid and 1qt of lube . The trans still the same im so mad i spend $500 on these crap. I feel like they rob my money and didn’t change crap bs but i dont know… should i buy a used low mileage 65k trans for $2k or rebuild for around $4k ?? I just dont want to have this problem but also dont want to keep spending all this money .. thanks men

[@DadsGarageDiagnosticSpecialist]

@@jcruz2010 that is a lot of money for a used transmission with more than half of its intended life on it… I don’t think I would do that. A remanufactured transmission would be the better option. Unless you could find a reputable transmission rebuild shop to have your current transmission rebuilt and they offer a good warranty. If your current transmission otherwise shifts OK, and the only problem you are having is torque converter shudder you may get away with replacing the torque converter and turbine shaft seal. Thanks.

[@esau5.3]

0:05 on my truck 2014 Silverado 6 speed it does the same but it doesn’t shake like that but RPMS do bounce like that when I accelerate more on the pedal. What could that be ?? Got check engine light on but it’s for p0420, p0430 Cadillac converter I’m getting longtubes soon so ima tune that, idk if it’s that or transmission going out??

[@DadsGarageDiagnosticSpecialist]

Torque converter shudder is really common on the 6 speed also… if fact I’ve done more 6 speed shudder repairs than 8 speeds. Thanks.

[@faridgadimov5955]

Great video thank you. Where can i find flush adapter?

[@DadsGarageDiagnosticSpecialist]

Thank you! This adapter is available as part of the Kent Moore DT-52263 kit. I’m sure there are aftermarket solutions available also. You can also get creative with the cooler lines at the radiator, etc. or possibly make your own adapter.

[@faridgadimov5955]

@DadsGarage Diagnostic Specialist last time I dropped the pan changed filter and disconnected cooler lines blowed all old fluid from there with air compressor then delete cooler line thermostat.then after couple days pumped out fluid from trans pan and added new one.

[@billmalone4164]

​

[@AdrlanMtz]

Just bought 2016 sierra 1500 with 132000 miles and noticed it did the same thing. Took it back to the dealership the next day and they did a flush and within 50 miles the shudder was completely gone. Been over 1000 miles and it hasn’t came back. Dealership said that with this issue a flush fixes it about 95% of the time

[@DadsGarageDiagnosticSpecialist]

That has been my experience. The fluid flush fixes most of them. Thanks.

[@petehenderson]

That's jus a temporary fix guys

[@morganlively2517]

@@petehenderson what’s the permanent fix?

[@GLOCKCOPG23]

@@morganlively2517It’s a “temporary fix” 5% of the time. The other 95% is good. Lol. Seriously my good buddy is a transmission guy and said that a flush, new filter, and AMSOIL synthetic tranny fluid fixes 8-9 speed trans the vast majority of the time unless it has super high mileage. Mine started at about 80,000 miles and has been good for about the last 28,000….not a shudder or stutter. He also said it’s a good idea to do this about every 70-80,000 miles.

[@cjproductions3683]

@@morganlively2517it is a permanent fix you’ll be okay. The reason they shudder is GM didn’t use the appropriate fluids in the 8 speeds. Therefor, many of them shudder. The fluid they add after flushing is different than the one that comes with them from factory. It fixes the issue & should not return. If there hasn’t been any additional damage of course..

[@donairsauce2496]

would this not cause long term damage? i've heard over the years that flushing fluid on an old trans can cause it to slip due to the fluid being 'too clean'

[@DadsGarageDiagnosticSpecialist]

That is a myth, mixed with a little bit of truth. The thing is, if your transmission was so dirty and neglected that fresh clean fluid would knock debris and varnish loose, it’s already too late and the damage was done long ago. The valve body is where the effects of debris and varnish would be found, sticky valves, etc. due to contamination… Also heavy amounts of debris can clog the fluid filter, but again if it’s that bad the damage is already done. The same logic applies to an engine, if the engine is so nasty and sludged up inside and you suddenly use cleaning chemicals, that sludge and varnish can come loose and clog the oil pump suction tube, but again the damage was done long ago due to neglect. The primary purpose of the fluid exchange on the 8 speed transmission is to change the fluid type, to modify the frictional characteristics of the fluid to allow a smooth application of the clutches…..imagine the difference between pushing your hand across a glass table dry versus lubricated with water or oil, your hand would smoothly glide across the surface, yet friction is still present…….otherwise when your hand is dry it would grab and skip….in other words it would “shudder” across the table. I hope that made sense lol. Thanks for the comment.

[@andyhedges5705]

Excellent analogy

[@davidbryant9158]

he kept it simple for the common folk. hes pretty good actually,ill give him that.@@andyhedges5705

[@user-bj8qp4fg6m]

Thanks, here from your clip. Mine is. 2020 Silverado with the 8 speed too. Just got it with 60k miles, put 2k miles on it and it’s just developing this issue. Since I’m catching it early and it’s not so bad yet, do you think a fluid change would resolve the issue? Or once it starts a flush is mandatory?

[@DadsGarageDiagnosticSpecialist]

The flush usually resolves most all of them. Otherwise, usually the next step is to replace the torque converter, unless there is a serious amount of metallic debris from the excessive wear. Thanks.

[@user-bj8qp4fg6m]

@@DadsGarageDiagnosticSpecialist thanks and one more quick one for you. Since I’m out of warranty, would a flush be something I could entrust to a local mechanic who may charge a lot less, or is this a dealership issue? Thanks

[@DadsGarageDiagnosticSpecialist]

@@user-bj8qp4fg6m anybody can do it if they have the adapters and a means to pump fluid in from the bottom of the pan. And of course they should follow service information.

[@user-bj8qp4fg6m]

@@DadsGarageDiagnosticSpecialist thank you!

[@user-bj8qp4fg6m]

@@DadsGarageDiagnosticSpecialist hey man, real quick question. Hard to find specific information online about this and will certainly call some other dealers and transmission shops tomorrow. I got my flush done today at Chevy at 62k miles after experiencing slight shudder on highway. I find out later after looking at my receipt that they put a “transmission conditioner” in. When I called the advisor told me he’d get with the tech and ask. Called back and said it’s a normal part of their flush and would help the clutch plates or something. I would NOT have approved this as I didn’t want anything other than ATF in my transmission. Is this something I should be concerned about and go back and demand a fluid change?

[@FLAKKOO99]

I have a 2018 5.3 6-speed first torque converter started to shudder at 104k miles and I replaced it without trying to change fluids first to see if the shudder would go away.. now I’m at 152k miles and the shudder is back with the new torque converter.. should I flush the transmission or just drop the pan and replace that fluid?

[@DadsGarageDiagnosticSpecialist]

Well at 152,000 miles the transmission is probably due for a complete rebuild at this point… Especially if it is contaminated with debris from a torque converter failure. If the transmission otherwise shifts and works normally, and you’re doing the work yourself then I think you could get away with replacing the torque converter and the turbine shaft seal as well as servicing the fluid…. A lot of people replace the torque converter, but they forget to replace the torque converter seal… Called the turbine shaft seal…. It’s a green o-ring on the transmission input shaft, I often find the seal is the cause of most TCC shudder problems on the 6 speed. Changing the fluid won’t help with a leaky seal or a dirty/worn valve body, but if the fluid is in bad shape then it might help. The reality is with that many miles the transmission may have multiple problems and it’s risky to take it out and only fix one part of it. Thanks.

[@awdx4g63]

does this shudder only happen to certain gears? or all gears? Mine happens only 3rd and 4th. why?

[@DadsGarageDiagnosticSpecialist]

A torque converter shudder can happen in any gear, but will usually be more noticeable a highway speeds. If your shudder happens in the same gear every time that can indicate a particular clutch inside the transmission is failing.

[@nandiito]

Is it okay to start the vehicle with the pan removed for all the old fluid to come out but without new fluid flowing in? (Empty it out)

[@DadsGarageDiagnosticSpecialist]

I wouldn’t advise doing that. Thanks.

[@aslammuhammed111]

My car having vibrations between 60-90 speed 2000 rpm or bit down… if i flush the oil and change it’ll be okey or need to repair whole gearbox?

[@DadsGarageDiagnosticSpecialist]

Thank you for commenting Aslam Muhammad. I recommend inspecting inside the transmission pan. If there is not excessive debris then a fluid service may help.

[@aslammuhammed111]

@@DadsGarageDiagnosticSpecialist so first should check the pan if it's okey oil flush will be okey right ? also if i get your mail or contact i could share pics or more details maybe you could help... in this place mechanics are so irresponsible thats why

[@DadsGarageDiagnosticSpecialist]

@@aslammuhammed111 yes if the pan does not have large amounts of metal or other debris a flush might help. Make a video on KZbin so we can see if you’d like.

[@hamzamansouri8565]

Great video man. Got my torque converter shudder at low rpm, can really use some suggestions. Cheers

[@DadsGarageDiagnosticSpecialist]

Thank you! What are your vehicle details such as year make model? Engine size? 8 speed transmission? I’d start by checking the fluid level and condition then drive with the scan tool monitoring the associated data. I would speed up and slow down many many times….both gentle and hard. Repeat under many different driving scenarios and try to pattern the problem….”Does it happen more taking off from stops or more when overtaking on the highway at higher speeds”…..”is it happening in only one gear ⚙️ or in every gear?” “Is it consistent or will it happen at random?” Etc… Also one of the first things I would check….”is it driven in 2wd upon arrival to the shop or auto 4wd?”

[@wildbill3811]

Mine is a 2011 Hyundai Sonata with 187,000 miles. I’m unsure about the history of the transmission fluid changes. I just bought the car. It has a brand new engine however with less than 100 miles. The transmission shudders while driving at speeds between 30-60mph. It shudders the most at 45 mph driving at constant speed when the rpm’s are at about 1.5. It has no problems shifting between gears. it just shudders while it’s driving at constant speed, not when shifting. The rpm’s mostly remain in the same spot when it shudders. Any thoughts would be seriously appreciated. Thanks!@@DadsGarageDiagnosticSpecialist

[@DadsGarageDiagnosticSpecialist]

@@wildbill3811 that kind of sounds like an engine misfire to me. Can you get it to jerk and shudder at lower speeds? What about if you do a power brake test, will it jerk and shudder at a stop? Thank you.

[@wildbill3811]

@@DadsGarageDiagnosticSpecialist no misfire. Engine runs smoothest I’ve ever had considering it’s brand new from the Hyundai dealership with less than 150 miles. Idle is very smooth no sign of misfire. And it does shudder at lower speeds. Just it’s most noticeable at those speeds in my opinion. The shudder feels like I’m hitting the highway shoulder grooves for a second. Thanks for the feedback btw!!!

[@DadsGarageDiagnosticSpecialist]

@@wildbill3811 I would just be curious if they reused the ignition coils from the old engine, and that could potentially be a misfire source. If you’re sure it’s not the engine misfiring then you may have a transmission slipping or torque converter clutch shudder. I have not personally seen a lot of transmission concerns on any Hyundai/Kia products, but I have been working on mostly all General Motors products for the last few years due to being at a GM dealer. Prior to that I worked all makes and models my entire career. How does the transmission fluid look and smell?

[@petehenderson]

What fixes it is a new converter.

[@Seventhson-im8os]

19 silverado 1500 just started experiencing the Chevy shake. Just out of warranty of course. GM acts like this is not a common problem with their vehicles. There is a recall but my vin is not included somehow. Basically I’m screwed. I believe that GM should be responsible financially but that would be in a perfect world

[@DadsGarageDiagnosticSpecialist]

If you’re just barely out of warranty you could probably have the dealership service manager request GM participation assistance for the repair and they will pay a portion of the bill. I don’t think there are any recalls related to the transmission on these trucks, there are service bulletins yes, but those are different from a recall. Thank you for commenting.

[@flyer8493]

My 19 Chevy tranny was flushed under warranty. But my truck has low mileage and still had the power train warranty. I didn’t have the shudder but some rough shifting. Shifts great now.

[@davidbryant9158]

this is the correct answer..The service bulletin is TSB 19-NA-121. It is a service bulletin not a recall as stated above.@@DadsGarageDiagnosticSpecialist

[@husseinsebai8489]

I have a mean shutter in my ‘16 CT6 8L45 transmission, I have a buddy with a shop who I said I would bring the fluid to for him to flush it for me. Which fluid and how many quarts should I take? Thank yoo

[@DadsGarageDiagnosticSpecialist]

24 quarts of Mobil 1 HP ATF Thanks.

[@husseinsebai8489]

@@DadsGarageDiagnosticSpecialist thank you very much🙏

[@EntrySpeedCo]

Mine just started shuddering. 6 speed. 119,xxx miles. Dropped the transmission pan abd had alot of metal flakes. Could i get away with just a torque converter swap?.

[@DadsGarageDiagnosticSpecialist]

I would probably replace the torque converter and turbine shaft seal and also the valve body, but realistically with that many miles it probably needs a complete overhaul and cleaning because the metallic debris gets trapped in so many places. Thanks.

[@JHKCF]

I’ve read GM has formulated a new ATF (Mod1a) to solve the shuddering issue but not made available to any cars sold before March 1, 2019. Do you have any info or updates on that?

[@DadsGarageDiagnosticSpecialist]

That is correct… They switched the fluid from Dexron 6 which was the original fluid on all 8 speed transmissions. They changed it to Mobil 1 HP to resolve the shudder issues and then after 2019 all 8 speed transmissions shipped from the factory with the updated fluid already in them. Even with the updated fluid, I still see torque converter shudder fairly often and the fluid service fixes most all of them. Because modern vehicles are using the torque converter clutch a whole lot more than in previous years… It is really hard on the fluid and the fluid turns black a lot faster from the torque converter clutch material and heat. Thanks.

[@JHKCF]

@@DadsGarageDiagnosticSpecialist Thankyou for responding. This is my last question and I won’t bug you anymore. I have a 2018 Caddy ATS 2.0T rear drive only with only 24k miles. I’m not currently experiencing any shudder but want to be proactive in solving this problem before it starts. When starting my car and backing out of the driveway, then shifting to drive it doesn’t engage for a few seconds is my only issue. Would you recommend I flush fluid now? And is the Mobile 1 HP the same formulation as GM’s newly formulated Mod1a?

[@DadsGarageDiagnosticSpecialist]

@JHKCF yes I will typically suggest the first transmission service at about 30,000 miles so you’re due to at least check the fluid condition and service the filter. You are welcome. Feel free to ask additional questions if needed.

[@thetrevinos1347]

My 2015 Yukon Denali is doing this same exact thing and is currently at the shop and they want me to replace the transmission but I’ve seen so many videos and stuff of people having this same problem and just flushing the fluid but my question is what kind of fluid did you flush and replace it with? I’ve seen another video of multiple people saying they used a new Mobil 1 synthetic LV AFT HP.

[@DadsGarageDiagnosticSpecialist]

Depends if your Yukon has a 6 speed or an 8 speed….being a Denali it probably has an 8 speed transmission. On the 8 speed the original factory fluid was Dexron 6, and the prescribed fix is to replace the fluid with Mobil HP yes. In my video I first inspect inside the fluid pan and change the filter to ensure the transmission or torque converter has not already been damaged because a fluid flush won’t help if the damage is already done. If there are no other signs of torque converter or transmission damage the fluid exchange has a very high success rate to resolve TCC shudder. Thank you to The Trevinos for commenting.

[@albertlatscha]

@DadsGarageDiagnosticSpecialist just had my Trans oil changed in my 8 speed , shudder still there realized they replaced it with dex 6 ! Smh heading back to shop next week

[@DadsGarageDiagnosticSpecialist]

@@albertlatscha it won’t really cause any damage, but yeah the updated fluid does help with the shudder.

[@Homer19521]

What kind of DexVI ATF does you recommend?

[@DadsGarageDiagnosticSpecialist]

On the 8 speed it should be Mobil 1 Dexon HP. If you have a different transmission that takes Dexron 6 then it doesn't matter as much on what brand of fluid you use, just don't use multi-vehicle ATF and change the fluid when it gets dark and smells burned...usually around 30,000 miles or so of city driving. Of course you can't go wrong using the factory fluid. Thanks.

[@davidbryant9158]

TSB 19-NA-121 service bulletin under powertrain warranty.@@DadsGarageDiagnosticSpecialist

[@albertohernandez4921]

Did you replace the filter to?

[@DadsGarageDiagnosticSpecialist]

Yes although the GM procedure does not require it. I like to take a look inside the pan for signs of further damage before performing the flush with updated fluid to verify we aren’t wasting time and money on a damaged torque converter or damaged transmission. Thank you for comment Alberto.

[@EACCOUNTINFO]

I just bought 2010 Toyota Camry have an issue of shuddering while driving between 40 to 60 mph. The acceleration gauge goes a bit up n down. There is periodic vibrations while driving between this speed.? any suggestions?

[@DadsGarageDiagnosticSpecialist]

Check and service the fluid first. Thanks.

[@edwinayala162]

I also have a 22 Toyota Highlander and I’m having the same problem. I took it to the Toyota dealer and they had to order the part for next week. Will it hurt the transmission if I keep driving because according to Toyota it won’t hurt.

[@RodrigoRodriguez-ri7wn]

Toook my 2019 gmc to get it checked out cause I noticed it shuddered and they recommended a flush and they did and didn’t fix the problem and I took it again and now they said it was the torque converter and when the truck was ready as soon as I left the dealership it was still shuddering . What could it be? I’m taking it again today , What should I tell them?

[@DadsGarageDiagnosticSpecialist]

If they replaced the torque converter and flushed the fluid already then they probably missed a leaky seal within the transmission or something in the valve body. Thank you.

[@edforthewin8574]

This is happening on my 2015 Yukon Denali XL 6.2L, you think this is a job I can do myself or just take it to the dealer?

[@DadsGarageDiagnosticSpecialist]

Thanks for the comment. This is something you can do at home if you have the know how and some specific tools to inject fluid in from the bottom. Might be less trouble to take it to a shop to have it done if you’re not set up to do it.

[@edforthewin8574]

@@DadsGarageDiagnosticSpecialist thank you sir

[@DadsGarageDiagnosticSpecialist]

You’re welcome

[@nandiito]

Do you think doing 2 fluid changes (pan drops) would be good to get most of the old oil out and avoid doing a flush that involves hoses? Or maybe 3 pan drops? 8L45 with 35k miles

[@DadsGarageDiagnosticSpecialist]

Yes if you get it nice and hot in between each fluid change out to ensure the thermal bypass valve opens. You can lower the exhaust from each side of the manifolds and the pan will come out, but watch out for those Y pipe nuts rounding off or chewing up the manifold studs on their way out. Use anti seize. If I were doing it this way I’d probably leave the exhaust in place, unbolt the pan and lower it then suction the fluid out each time then remove the exhaust one time to remove and clean the pan then change the filter. Thanks.

[@nandiito]

@@DadsGarageDiagnosticSpecialist Thank you for your fast and clear response 👊 I will do it 2 times, will consider 3 if the fluid looks pretty bad or if I see a lot of metal/gunk. Got it, filter in the last pan drop 👍🏼 thanks again!

[@DadsGarageDiagnosticSpecialist]

@nandiito you are welcome. Update with what you find inside the pan and if it fixes your problem.

[@nandiito]

@@DadsGarageDiagnosticSpecialist I did it today and it was a success! Never done this particular job but I’m also pretty mechanically inclined. No big pieces of metal but a considerable amount of metal “dust” like this gray paste. Cleaned it off completely. Oil was more burned than I expected to be for 35k miles although it’s a 2017 so it’s old. I did replace the filter today because it seemed pretty dirty. I can leave it or don’t mind replacing it again on the following change within a week. I removed the Y pipe completely but without getting it out of the truck. I disconnected both front flanges, the rear flange with the flex pipe and the mount that holds it up with the rubber. Made it super easy after this. I drove about 12 miles and temps reached about 150-155 degrees. You think I should do the following fluid change tomorrow after a drive? Or wait longer?

[@DadsGarageDiagnosticSpecialist]

@nandiito that sounds like good news. If the fluid was dark and smelly I’d probably finish changing it out.

[@atillaismail5411]

change the filter and fluid and there is no trembling and shudder never any more i had same issue but after i change them the car great now

[@DadsGarageDiagnosticSpecialist]

In most cases changing the fluid solves the problem. Thank you for commenting.

[@jmx7656]

I drive a 2014 Silverado with the 6.2l engine and mine started at 188,236. Had it replaced and started up again at 192, 678. This time the transmission had to be replaced. 😢

[@DadsGarageDiagnosticSpecialist]

Thanks for sharing!

[@flyer8493]

Just curious. How many miles on this fluid?

[@DadsGarageDiagnosticSpecialist]

I don’t remember. The fluid will usually look pretty dark by 30,000 miles. Thanks.

[@flyer8493]

@@DadsGarageDiagnosticSpecialist I got my 19 Silverado with around 12k miles. At around 14k I swapped the stock cooler thermostat with the STL010. The fluid was already dark. Crazy.

[@DadsGarageDiagnosticSpecialist]

@@flyer8493 that is about what I have been seeing also

[@richardadelberg8961]

What scan tool did u use?

[@DadsGarageDiagnosticSpecialist]

I used GDS2 which is the factory tool. The same testing can be accomplished with several different aftermarket scan tools. Thank you.

[@richardadelberg8961]

I’ll see if Lexus dealer has the tool!​@@DadsGarageDiagnosticSpecialist

[@DadsGarageDiagnosticSpecialist]

@@richardadelberg8961 you’re wanting them to scan the vehicle or do the transmission service? They will need a couple of fluid adapters to do the transmission flush, but there are other ways to accomplish the same thing with other machines. Although if they don’t do this job every day their machine won’t be set up to use Dexron HP. Thanks.

[@richardadelberg8961]

@@DadsGarageDiagnosticSpecialist I want them to confirm what I feel is 8 speed 2018 rx350 with 44k has just started torque converter shuddering 3 rd to 4th under some conditions. Doesn’t help in Baltimore it been 10degrees hotter then normal. Fluid may be overfilled? Never been changed. They did a engine trans computer upgrade but mechanic doesn’t feel it. If they have the scan tool they should confirm it. They have a flush machine and charge 475 to do it. Heck with my accord I just unhook cooler line and let it pump it out.

[@DadsGarageDiagnosticSpecialist]

@@richardadelberg8961 yes they would need to confirm any shudder with a capable scan tool. An engine misfire can also feel like torque converter shudder at times too. Doubt the fluid level being overfilled would cause these symptoms.

[@edforthewin8574]

I have this issue trying to go 40-50mph then goes away on my 2015 Yukon Denali XL 6.2L

[@DadsGarageDiagnosticSpecialist]

Check out response to your other comment. Thanks.

[@sackracerdrae]

I just bought a 2018 GMC Denali 1500 two months ago with 56K miles on it and drove it to GA the same week and noticed the shudder but I was in the mountains and just thought I hit the road bumps or something. Then it eventually started happening when I would drive it to work on weekends. Then u goggled about truck shaking or shuddering I know now.🤦🏾‍♂️ Pretty sure thats why whoever had it traded it in i got it shipped from Carmax in Colorado. Guy tellin me how much it cost gave me a price got his own shop but imma check with dealer to see how much they charge

[@DadsGarageDiagnosticSpecialist]

Rough estimate would be $500-$800 for parts and labor if out of warranty. Depends how much the shop wants to charge and IF they are also replacing the transmission filter like I do in the video or not. Thank you for commenting.

[@sayedengine]

If you owen chevrolet/GMC/Ford/Cadilac just change transmission fluid with AMSOIL and add LUCAS transmission conditioner

[@DadsGarageDiagnosticSpecialist]

Thanks for commenting.

[@gerasssss]

that’s exactly what my 18 Silverado is doing but it does it randomly not on a certain gear or MPH. It will vibrate then go away and vibrate again and go away just like the beginning of the video

[@DadsGarageDiagnosticSpecialist]

Time for a the transmission pan to be removed and inspected. You might be able to save it if there is not an excessive amout of metal in the pan. Thanks.

[@gerasssss]

@@DadsGarageDiagnosticSpecialist Thanks for replying back so if there’s not that much of metals I should change the transmission fluid and it should solve the problem? But what if there is a lot of metals what should you recommend be done next

[@DadsGarageDiagnosticSpecialist]

@@gerasssss flushing the fluid with the new type of fluid fixes most of them. If you do find an excess amount of metal you’d have to replace the torque converter and possibly overhaul the transmission if it’s severe.

[@gerasssss]

@@DadsGarageDiagnosticSpecialistYour the man! I appreciate all the info and your video my truck does the vibration sometimes not as bad as your video but it will come and go sometimes I’m still going to change that fluid tho. Thanks again have a good day 👍

[@DadsGarageDiagnosticSpecialist]

@gerasssss ​​⁠you probably have time to save it then if it comes and goes. Thank you, I do what I can.

[@BBSAXX]

Fluid out = fluid in if no detected leak. Temp won’t matter.

[@DadsGarageDiagnosticSpecialist]

In theory, yes. If you were to assume the fluid level was correct to begin with. Thanks.

[@markmanning5683]

My 2019 Silverado 5.31 V8 - 8 speed Transmission at 7700 miles has Shudder at 17 - 24 Mph and again around 52 Mph. Dealer said Flush cost is $500.00 to $800.00. I have to drive 500 miles afterwards, if the Shudder is still there, they will change out Torque Converter, if that does not work, I get a New Transmission. NOTE: First Multiple Flush as seen in this video is on me (Bull Shit), if shudder is still there the repairs will be on the remaining warranty. My Bumper to Bumper expired in 2022 (36 months), I purchased a Extended Warranty at my Chevy. Dealer just before the Factory Warranty expired. Zurich Warranty was $3,800.00 to purchase. Everything is $0.00 if all the warranty work is done at this Dealership, $100.00 deductible at any other location. GM has known about this issue for a long time. Class Action Law Suit (which I am going to join) is in the works. GM's problem, they can fix all of it on their Nickle. Only other issue was a small water leak on Back Glass, I fixed it on my own (so it would be done right). 2 recalls on the Software (minor inconvenience). I know about the DFM and Lifter issues. As you can see my Truck is over Four Years old now and I only have 7700 miles on it. (Burning the Tires off) Ha Ha Ha. Truck is a LTZ and I really like it, but........ Yes it was expensive, Stickered at nearly $70,000.00 I did a 4 Year Lease at the beginning, bought the Truck just at the end of the lease for $35,200.00 All considered it still added up to $70,000.00 This much Money, GM can fix this and Mary Barra can just down size from her Multiple million dollar raises each year.

[@DadsGarageDiagnosticSpecialist]

With only 7700 miles it should still have a powertrain warranty, but maybe it’s expired on time…..either way it should still be warrantable…. There is a process to do it even if it’s expired. For what it’s worth the fluid flush does fix 9 out of 10 shudder complaints in my experience. Thanks.

[@markmanning5683]

I have learned that there is nothing "Fair" in life. Businesses are "Cold" Business, once they have your $$$$, that's it. The have Warranties only because that is the only way the can sell their product. In my case Trucks stopped being Trucks around 1975. Simple, Hard working with AM/FM Radio's and maybe different Interior cloth or plastics. I will return will after the Flush and my 500 miles. Lastly, I see a aftermarket Converter additive that stops slippage, I would probably get this stuff, but I don't know where I can add it to the ATF. No Dip Stick in this Truck. Any idea's??

[@DadsGarageDiagnosticSpecialist]

You would have to inject the fluid from the bottom as shown in video would be the easiest way to do it. So you’re still having problems how many miles after the fluid flush? Did it get better at all? Thanks.

[@markmanning5683]

388 Miles were put on my Truck after the Flush. I took the Truck back and the Dealership is ordering a New Torque Converter. Truck has been sitting for a little over a Week for the new parts. I asked the Service Writer what happens if the Shudder is still there after this New Torque Converter? She was silent. I learned that there was still Power Train Warranty until 03-26-24, so all this is being done on the Warranty. I did request a New Filter be installed during the Converter change out. I will advise what happens after all this. Thanks for your Input and Interest.

[@DadsGarageDiagnosticSpecialist]

@@markmanning5683 thanks for the update

[@gabooda2380]

Hoping someone could point me in the correct direction. I have a 2005 Chevy Express 4.8 with just under 300k on it. It has developed what sounds like a lifter problem but sounds like its coming from the transmission. It has a ticking noise while in idle whether in park or in gear (both drive and reverse). The noise goes away when i switch from reverse to drive OR under slightly more pedal than idle. I checked the fluid thinking maybe it was low and that was why it went away with a little load on it but it was full. Any ideas what it could be? Thanks.

[@DadsGarageDiagnosticSpecialist]

Sounds like a possible exhaust leak or broken transmission flex plate. Possibly upload a video of the noise on KZbin for all of us to check out. Thank you.

[@crackerjackflash8384]

Don't waste your time and money getting a new torque converter. You're better off just getting a new transmission

[@DadsGarageDiagnosticSpecialist]

Yes many times it’s not worth it due to high miles. It can definitely be a risky repair. That being said on the warranty side of things the manufacturer will usually make us only repair the minimum so if there is no apparent additional damage or wear. I’ve replaced several under warranty and those were successful and lasting repairs, but we always check for further signs of damage inside the pan first. If there is any debris at all it’s a no go for me. Thank you for the comment.

[@crackerjackflash8384]

@DadsGarage Diagnostic Specialist I bought a 2012 Silverado 1500 recently and not long after i got it the torque converter started stuttering like i was driving on rumble stripes. Took a look at the transmission and of course it had crayon written all over it, without knowing how many miles were actually on it. I just went ahead and put a new transmission in it

[@DadsGarageDiagnosticSpecialist]

Yeah the torque converter clutch programming wears them out a lot faster than older cars because it’s being turned on and off constantly at lower speeds so that’s not too surprising. I find on these transmissions you really have to keep the fluid serviced to prevent premature failures.

[@gamingbullys1220]

I just had problems with my transmission in my 2009 honda civic exl and I just purchased a used transmission from used Japanese parts company in my country 🇯🇲

[@isnowyazn]

@@gamingbullys1220LOL happy for you, but that’s not related at all to these 7-8+ speed modern automatic transmissions….

[@quantumz5934]

Amsoil ATF .....

[@DadsGarageDiagnosticSpecialist]

Thanks for the comment. I suppose you’ve have good results with Amsoil. I have not tried it.