Turbo 400 Vacuum Modulator Adjustment Explained And Test Drive

[@christhompsonphotography6783]

You are my hero r

[@dragsterstransmissions]

@@christhompsonphotography6783 Thanks

[@christhompsonphotography6783]

@@dragsterstransmissions Mine turned out to be dry and cracked lines. Luckily.

[@West_Coast_Ganbaru]

This is actually great. This video needs to go viral

[@dragsterstransmissions]

@West_Coast_ That would be great then maybe KZbin get their foot off my neck. It's along story that I don't entirely understand. Anyways thanks for comment and for watching. Subscribe to my channel there are other turbo 400 videos in my playlists titled "turbo 400"

[@forrestyates1362]

Nice to see somebody knows what they're talking about thank you again

[@dragsterstransmissions]

@Forrest Yates thanks for the compliment and for watching and subscribing

[@carsandchrome]

Thank you, great video. I was always led to believe that the modulator only adjust the rpm shift points, but it is very limited. I did not know that it can also make it shift harder or softer. I learned something today which may very well solve my hard shift into second gear problem. We'll see tomorrow when I get back under there to make the adjustment.

[@HoldFast-un2fc]

I always liked the th400 because of one i owned many years ago and now i have another but the vehicle is quite a restoration job and getting close to testing it out and to see how it shifts and this video will help a lot im sure.

[@mynamewastaken29]

This is awesome, the new th400 I just put in my k5 shifts so hard I thought it had a shift kit installed by the previous owner can’t wait to try it thanks

[@philchigges2955]

My buddy was asking me about his shifting way too fast.thanks for the info.

[@dragsterstransmissions]

There's several reasons early shifting is happening

[@joshuaatkins5197]

I can't tell you how many of my test lights have gone home with somebody's car at the end of the night😂

[@AndysDogHouse]

Hey Drasters. I don't have a problem with hard or shift shifting. My TH400 Is not shifting at all. This transmission was working great before I put it in my truck. I took it out of my buddy's car ( 1970 Pontiac 350 CI). I am putting it in my 54 Fargo with a 307 Chevy motor. I see that you are a transmission Guru so I thought I would ask you.

[@mauricejones6193]

Thanks brother, smooth shifting now😂thanks alot

[@dragsterstransmissions]

@mauricejones6193 Awesome glad it helped and thanks for watching

[@raymondmoreno7442]

Thank you a great video of I'm doing work to my transmission learned a lot

[@adamgaron420]

still helpful - you could make a new video just doing this cover over again - dealing with shift problems in a daily driver th400 -thanks from lake tahoe

[@JimYurachek]

You sir, seem to be a master transmission mechanic! May I ask you a question? On my Th400, it will shift from 1st to 3rd before I'm going 15 mph. Way to soon. Will adjusting the vacuum modulator help, or will I have to adjust weights in the governor? If weights will need to be adjusted, do I increase or decrease to make it shift later? Thanks in advance, keep the videos coming, Thanks Jim

[@dragsterstransmissions]

@user-dv3ke1bb51 If the complete governor assembly was changed then there is a pretty good chance it has different weights and springs installed. I'm currently loading a video to my channel explaining what to do. Or you can go to my playlists titled turbo 350 and scroll til you find a video titled governor. Thanks for watching

[@MichaelCologie]

Thanks for your great info

[@andrewmartin6217]

Thank you! This helped me. Put a built 350 in my 79 Chevy 3/4 ton 4x. Transmission shifts real soft and too early. I'll start with adjusting that modulator. Also the transmission dipstick keeps popping up. I don't know whats causing that.

[@dragsterstransmissions]

Check vent fitting on driver side top of case. If no fitting then the hole is there for one. Make sure its clean. DO NOT use an air hose

[@dragsterstransmissions]

Did you get it fixed up??

[@rickfazzini22]

Thanks for the informative video! Where do you pull the vacuum from? Any port on the intake?

[@dragsterstransmissions]

@Rick Fazzini Yes intake manifold vacuum is best

[@exiledmotorworks1518]

Very informative. My "pro shop" rebuilt TH400 on my 78 Chevy in D shifts 1-2 at 40MPH and 2-3 @70MPH, yet in L2 she shifts from 1-2 @15MPH. This means the springs of the governor are wrong, all I need to do is replace them?

[@dragsterstransmissions]

78 Chevy what? What vehicle are we talking about? Need info on what you driving. Vehicle type,engine, tire size, gear ratio

[@exiledmotorworks1518]

1978 K20 Suburban 4WD with a 350 Eng, Th400/NP205. No idea on the gear ratio. LT285/75R16. I don't get why there is a difference between how the truck shifts from 1-2 in L2 Vs D in normal driving, nor too pleased with the shift points in D under normal acceleration.

[@okanaganroad3308]

Thanks man great video.

[@sukeetoboodo]

Definitely helps seeing how its done. My truck has been shifting slowly into second and sometimes not into 3rd while going in to neutral some. Going to attempt to change this first

[@dragsterstransmissions]

When you shift from park to reverse or any forward gear is it slow to engage??

[@sukeetoboodo]

@@dragsterstransmissions after the truck has been running yes. When I cold start and take off it shifts all 3 gears. After a while 3rd is no more and sometimes goes into neutral on hard acceleration

[@dragsterstransmissions]

@@sukeetoboodo it needs to be rebuilt and a new convertor installed

[@michaelg6890]

By any chance, can you explain why th400 filters are "loose"? Cannot get a solid answer as to why there's so much play between bolt head and filter. Thank you

[@-ZIO]

I have a TH400 in an old C3 Vette. Low miles stock L82 with the only upgrade being close chamber aluminum heads. Runs fine at part throttle and shifts ok but at full throttle it will not shift into second before the valves start to float. If I ease off the petal it will then shift into second. I have a new modulator on the way, I hope this resolved the issue. Any thoughts are appreciated.

[@dragsterstransmissions]

@-zio How long have you had the car and what has been done to the transmission?

[@lorarosell3384]

Great job. Thanks for the adjustment

[@dragsterstransmissions]

Glad my video(s) helped out. Thank you for watching. Kris

[@MLEB723]

Does a new modulator come set to a certain point or should you adjust in or out before even starting? Like when you adjust a carb you turn the screws all the way in and then adjust them out to the correct positions.

[@dragsterstransmissions]

@Knuckle Busters DIY turn valve to the right 2 turns to start that will firm up shifts a bit

[@waynew2831]

Can you tell me about the vacuum line going to the modulator valve? Does the hard metal line have a check valve in it ? Should I run a line from the modulator valve to the manifold or proted vacuum on carb? Thank You.

[@dragsterstransmissions]

Manifold

[@JK-dn4pu]

Exactly the answers I was looking for, thanks for your time👍

[@dragsterstransmissions]

Glad I could help

[@richardlankford1381]

Doses any one know

[@dragsterstransmissions]

@@richardlankford1381 does anyone know what exactly?

[@richardlankford1381]

@@dragsterstransmissions why wood the modulator hose keep coming off at the transmission

[@dragsterstransmissions]

@@richardlankford1381 is the hose soft squishy? If it is replace section of hose. Has the dipstick popped out of the tube recently?

[@GJJC13]

Great clear video. Thank you. Question: my Corvette 1978 shifts too hard from 1st to 2nd. Kind of "thumps" into second with noticeable shake. From 2nd to third is really smooth. Would this adjustment (counterclockwise) help? Thanks

[@dragsterstransmissions]

You can try adjusting the Modulator. First make sure the rubber hoses are good in fact just replace them. Check the metal vacuum line as well. Take it off plug off one end and try and blow through the other end. You could have a bad Modulator. Or the hose may have popped off also. Make sure the vacuum line is connected to a full time vacuum port. One of these things I've talked about could be the issue. I'm thinking it's an internal issue but I don't know what's been done to the tranny. Hope this helps. Thanks for watching the video. Keep me posted on what you find.

[@GJJC13]

@@dragsterstransmissions Thank a lot! Great advise...

[@ralphmccolgan7879]

Thank you 🙏

[@bentroche6568]

Cool...I need to adjust mines. Thanks for the input.

[@dragsterstransmissions]

Thanks for watching my videos

[@bentroche6568]

@@dragsterstransmissions I need some advice on changing out my center support bearing. I have a th400 sb350, vehicle is an 83 Chevy c30 dually. Or if you happen to have a video or link. Bearing looks fine just slightly crooked to my eye and the metal plate that's their rattles. Thanks a bunch

[@dragsterstransmissions]

Are you talking about the center support in the tranny or the carrier bearing in the drive shaft?

[@bentroche6568]

@@dragsterstransmissions driveshaft

[@dragsterstransmissions]

Ok is it a crew cab long bed?

[@Keeterbob]

At WOT. Does adjusting make it shift sooner and later. At WOT my Th350 shifts about 300 rpm too late

[@dragsterstransmissions]

@@Keeterbob is the kickdown cable hooked up? You can try adjusting the modulator by backing it off 1 full turn

[@cetate93]

Hey I've recently had issues with my TH400. It started getting harder and harder to get in and out of Park. I don't think it has to do with the Reverse selection because Neutral to Reverse is okay. I've got a side detent floor shifter because the truck used to be Manual. Only thing I could think being the cause of the issue is when I changed the filter and maybe I bumped something?

[@dragsterstransmissions]

Check your cable adjustment. Start with neutral and work your way to drive then 2nd then first.

[@cetate93]

@dragsterstransmissions I ended up dropping the pan again and noticed it was dented so bad that it was pushing the filter up enough to interfere with the rooster comb. The problem is fixed now.

[@dragsterstransmissions]

@cetate93 10-4 I guess I got to make a video why I'm not getting notifications from KZbin when someone comments on my videos.

[@jodydewey3516]

do all TH350s come with an adjustable vacuum modulator or do those have to be purchased?

[@dragsterstransmissions]

@Jody Dewey some of the early 350 trannys came with a non adjustable modulator. The modulators you buy now are adjustable.

[@juanrzarate5690]

Hi, thanks for the video, I changed the Vacuum modular but still shifting strong and under too much revolutions . It shift up to second only if I step in the gas if I don’t the transmission will never shifts

[@dragsterstransmissions]

Turbo 400 transmission??? it is sounds like you have valves sticking in the valvebody

[@brandonwoods9866]

Thanks man great video. I will do my adjustment now after seeing this.

[@dragsterstransmissions]

Glad to help. Thanks for watching 👀 Subscribe to my channel There's more transmission videos in my play lists

[@TempoDrift1480]

I got a 400 that really bangs into reverse. I did find some hoopa-juped universals and swapped them out but it's still on the concerning side. I lowered my idle a might too.

[@dragsterstransmissions]

Did you get it figured out?

[@dylansgarage1685]

Did you figure it out?

[@TempoDrift1480]

No I still have not figured it out but I just ordered a reverse cushion kit from Transgo so we'll see how that goes. I've no idea where to start other than dropping the pan.

[@chuckcelestine6558]

Great video! I have a 1984 Georgie Boy Cruise Air II with a chevy 454 / turbo 400 and when It goes from 1st to 2nd gear it starts whining going up and down like it's down shifting. Asking for your help or advice. Thanks!

[@chuckcelestine6558]

By the way that Georgie Boy is my motorhome. Thanks

[@dragsterstransmissions]

Gotcha

[@dragsterstransmissions]

Whining could be coming from the planetary gears or pump gears But I dont understand what you mean by up and down.

[@MrGriffin23]

Great explanation

[@mike79935]

Can I put a regular 5/32 vacuum hose on the modulator? Will it collapse? Or does it need the special metal hose with heavier rubber hose on the ends?

[@dragsterstransmissions]

Metal is best 👌 Thanks for watching the video. Consider subscribing if you haven't already

[@Anth4044]

Does it matter if my transmission Has a shift kit, and when do you suggest changing the modulator? Thank you.

[@leorolivas2]

This helped a lot thanks man

[@dragsterstransmissions]

Thanks for watching my videos

[@megahaze5101]

Thank you

[@ourkid2000]

I have a TH425 (similar right?). It was shifting late in both 1st to 2nd and 2nd to 3rd. I swapped out the modulator for a new one and 1st to 2nd is totally bang on now yet 2nd to 3rd still a little too delayed. Any thoughts? Great video!

[@dragsterstransmissions]

@chris Did you change anything to the engine or tires or gear ratio?

[@ourkid2000]

@@dragsterstransmissions No sir! This car (66' Toro) has been in my family for 49 years now and we have never touched it other than standard maintenance. It's been babied its whole life. It's got new tires I suppose but they're on the stock wheels. It shifts smoothly, park to reverse and fwd seem solid and quick, everything seems great except that 2nd to 3rd timing.

[@dragsterstransmissions]

@@ourkid2000 ok the governor might be a bit sticky. Check out my playlists titled turbo 350 I explain what to do with the governor

[@ourkid2000]

@@dragsterstransmissions Nice! Thanks so much, Ill have a look at the governor. The 425 gov design looks a bit diff than the 350 and 400. It sits within a round cap and it's almost as if it the gov can't physically come out of the cap. It's definitely not obvious how it comes out anyway.

[@dragsterstransmissions]

@@ourkid2000 66 tornado wow that's rare front wheel drive. Ok now some of those did shift a little early or late. I subd to your channel make a video of yo removing the Governor so I can see it. That's a rare transmission these days I don't see them as much

[@ISGOODATIT]

I just installed a used 400 trans into my 83 c30.. (planning to get the original rebuilt). I'm having two issues. One is that it seems the dipstick is being blown out of the tube at least twice a week when I'm checking under the hood. 2ndly it's as if i have a governor on the motor now or something. The acceleration just isn't there anymore. Do you think adjusting the modulator or governor in the trans will help with that..?

[@dragsterstransmissions]

First are you sure you have the correct dipstick installed? If so check the vent on top of trans? As for acceleration put shifter down in low gear to make sure it is taking off in low.

[@americanbully9583]

Great video simple and straight to the point.

[@dragsterstransmissions]

Awesome. Thanks for watching. Subscribe to my channel and look in my playlists for other Transmission videos

[@trinierhodges936]

Thanks alot

[@ronaldogonzales115]

I have a th350 turbo , will shift to reverse and drive great, but when I wanna drive down the road it will not go into 2nd or 3rd gear at all, I’ve checked the governor it was not locked up, the kickdown cable worked like it should. will this fix that issue?

[@dragsterstransmissions]

@ronaldogonzales115 Sounds like a stuck valve in valve body

[@noahpickel1726]

I have a turbo 400 out of a humvee than I plan to use for a rock crawler build. It has a cable actuated modulator could I install a vacuum modulator to replace it ? Or is there more to it than that

[@dragsterstransmissions]

Is your humvee a diesel? Is it going to stay a diesel as a rock crawler?

[@garyjackson9769]

Dose the kickdown cable have anything to do with the transmission shifting to early

[@dragsterstransmissions]

@Gary Jackson Turbo 400 has no detent cable. You will need to remove the governor and recalibrate it. Check my playlists titled turbo 350. I got videos in there showing how to do it. Thanks for watching

[@CarterHornback]

How do you make it so that it shift smooth at low throttle inputs and aggressive at higher throttle inputs? I have a th350.

[@Speider43]

Can you change one without draining fluid?

[@dragsterstransmissions]

Vacuum modulator yes but expect a bit of fluid to leak out

[@carsrcool7149]

Good vid !

[@dragsterstransmissions]

@CarsRcool thanks for watching and subscribing to my channel

[@brookewoody8620]

I'd like my 3rd to come in at a slower speed do I change the spring in the governor to make that happen?

[@dragsterstransmissions]

Yes and you can mix match the spring colors

[@jasonredwood154]

Thanks for this video. I’ve been noticing in my 1970 sbc350/th350 that shifting from 1 to 2n and 2nd into D there’s a slow transition. Delayed if you will. When I slap it from 1-2-D it shifts fine. Reverse is fine. The car did sit for very long periods of time. I was planning on changing the fluids/filter and now changing the modulator out. Any other suggestions?

[@dragsterstransmissions]

A rebuild may be in the near future since it sat for a long time and you don't know how long it has been since the transmission was rebuilt before sitting. The Seals on the forward and direct pistons get hard and brittle when it is not getting used. Yes drain the pan and look in the bottom for metal and grayish black sludge. In my playlists "turbo 350" there are videos there I explain vacuum modulator functions and governor functions also. Keep me posted on your findings. Thanks for watching and subscribing to my channel

[@yamahaguy1732]

I’m here because my truck shifts when I floor it at about 4 grand and it’s peak power is about 4500 so thanks I appreciate the information now I’m doing this on a th350 I don’t really think they have that cover for shift points do you know anything about them

[@dragsterstransmissions]

Watch my other videos on how to set shift points by calibrating the Governor. The Governor is how you change rpm shift points properly. I don't know how to share links with my other videos. Hope this helps

[@dragsterstransmissions]

Did you get it straight

[@yamahaguy1732]

Dragster Shop Transmissions I haven’t messed with it Much

[@nathansprinkle1187]

Good stuff!

[@dragsterstransmissions]

Thanks

[@frazieack6797]

Would this soften the shift into reverse? My 400 has a hard shift into reverse..

[@dragsterstransmissions]

Depends what vehicle the trans is in and which modulator you have? There's 3 different sizes modulators out there.

[@dragsterstransmissions]

Need more info on your setup

[@dragsterstransmissions]

What I meant was you need to check your line pressure. Start there and give me the pressure numbers in reverse drive neutral park

[@jalenhawkins8931]

I have a th400. A guy went back thru it. Changed governer and modulator. He didn’t see anything else wrong. It shifted one time afterwards and I can’t get it to shift anymore. I changed all vacuum lines Nd fuel hoses , fuel pump and sending unit. Any help please!!??

[@dragsterstransmissions]

@jalenhawkins8931 Start by removing the governor taking it apart thoroughly cleaning it. I have videos in my playlists titled "turbo 350" showing how it's done. 350 and 400 share the same governor

[@irvingbar4569]

I have a 327 mounted to a 700r4 in a 1956 chevy belair it Rev's pretty hard before shifting into 2nd gear when it shifts it hits extremely hard can this be fixed using this method or is this the cable adjustment from the transmission

[@dragsterstransmissions]

@Irving Bar How long has the 700 been in the car?

[@irvingbar4569]

@@dragsterstransmissions just recently installed

[@dragsterstransmissions]

@@irvingbar4569 so the 700R4 was recently built then. Back to your original post. A 700R4 does not have a vacuum modulator. As for the cable that is a "TV" (throttle valve) cable and controls pressure throughout the tranny. If the cable is not adjusted correctly the tranny will be burnt up by the time you reach the end of the driveway. Yes itt can happen that fast.. If the tranny is banging into 2nd then the cable was off and or the 2nd gear clutch is busted.

[@dylansgarage1685]

I got a 89 Chevy Silverado k3500, with 454 and th400 all original stock. Just replaced the vacuum modulator 1st to 2nd still has a delayed shift. And this truck bangs in reverse so hard I'm afraid I'll break a u joint or my rear end.

[@dragsterstransmissions]

Start with removing the governor and inspect gear. Make sure that governor housing itself is ok. You may be pulling tranny out but start here first. I have other videos in my play lists explaining the governor

[@brookewoody8620]

What speed does your 3rd gear come in ?

[@Diego-ld6hn]

I have a question, so I have a 454 motor with a Turbo400 and every time im driving once i hit 20mph like the car wont keep going when im steppin on the gas it just gets on a high rpm until i step on the gas again it shifts with a big jump, what do you think may cause that? Ive connected my vacuum line to my carb it has alot of air pressure goin towards it. I have a holley carburetor. Lookin at this vid makes me think ill have to adjust the modulator but im honestly not sure. Can you please lmk thanks!

[@Bigrich0g]

Did you find the problem i would connect it to the intake manifold that's how i got mine Edelbrock intake

[@jalenhawkins8931]

Did u ever find out problem

[@brookewoody8620]

What speed should it go into 3rd gear it's a turbo 350 it would be great to hear from you?

[@dragsterstransmissions]

Ok let's start with what mph does the 2-3 shift occur now? What's the rear gear ratio? What's the tire height measured with a tape measure?

[@ForrestWhite-dx5ht]

Good evening i have a turbo 350 paired with a 383, it has a 3.55 rear end. I cannot get the car to go over 55mph, its screaming 4500 5000 rpm, ahould i replace rhe governor? Thank you

[@dragsterstransmissions]

@@ForrestWhite-dx5ht have you tried to manually shift it first second third to make sure it has all three gears while driving?

[@ForrestWhite-dx5ht]

@@dragsterstransmissions it does seem like it's going into all 3 gears when I do it manually I shift at about 4000 rpm When I shift from 2nd to 3rd it drops from about 4000 rpm to 3,000 and it's back up to 4500 in no time lol, I'm lost on it

[@dragsterstransmissions]

@ForrestWhite-dx5ht torque convertor is failing or its too loose.

[@ForrestWhite-dx5ht]

@@dragsterstransmissions thank you I will look into it further this is a brand new build, I purchased a jegs stall converter 60402k since that what was recommended. Just not acting right, I appreciate you replying!

[@dragsterstransmissions]

@@ForrestWhite-dx5ht keep me posted on how it works out

[@francescolorusso2796]

Ciao, i miei complimenti. Sto imparando molte cose da te. Ti chiedo, se possibile, fare un video su come installare un contagiri motore. Il mio GMC Chevrolet P30 6.2 diesel no ha questo dispositivo di fabbrica. Desideravo installare un contagiri . Un abbraccio dall'Italia Altamura (Bari).

[@dragsterstransmissions]

@Francesco Lorusso I don't speak your language

[@francescolorusso2796]

@@dragsterstransmissions ti ringrazio per avermi risposto. Il video puoi farlo con la tua lingua USA. Io guardo i tuoi video con l'uso dei sottotitoli tradotto in italiano.

[@jahfiyah619]

So if i got a new one ...how many turn should i start with

[@dragsterstransmissions]

1.5 turns inward

[@jahfiyah619]

@@dragsterstransmissions so I’m assuming the valve come close, and I opening it right ??lol

[@dragsterstransmissions]

It should be pre set out of box.

[@thomaswilsonsr.9206]

I'm rebuilding an old pontiac motor, 78. I forgot the vacuum lines, but most importantly the modulator. Do you know where on the carburetor the hose connects to? Could you demonstrate how to read vacuum diagrams?

[@dragsterstransmissions]

What carburetor you using

[@dragsterstransmissions]

The modulator line needs full time vacuum source. Either behind the carb somewhere on the intake manifold or the carb itself. Once I know which carb your using I can help

[@thomaswilsonsr.9206]

@@dragsterstransmissions The Rochestor dualjet 210. Ol' reliable, classic GM. I made this mistake once, and it took me several days to correct it. Fortunately, I was able to reroute the lines and figure it out - of course the motor was bolted and connected. My vehicle's vacuum diagrams is unfortunately worn to where it's unreadable...

[@dragsterstransmissions]

@@thomaswilsonsr.9206 what vehicle what year?

[@thomaswilsonsr.9206]

@@dragsterstransmissions 78' Pontiac Bonneville, Brougham. 301 C.I, it had the turbo 350

[@juanchoman9824]

What does shifting to hard mean ? Sorry curios

[@dragsterstransmissions]

When tranny upshifts on the 1-2 and 2-3 shifts. Does it shift to where you barely feel it. Or does it shift almost like a bang

[@juanchoman9824]

@@dragsterstransmissions I have a th400 and when I'm driving from 1-2 the rpm stays high and "bangs" into 2nd. Unless I take my foot off gas then press it again

[@dragsterstransmissions]

@@juanchoman9824 did transmission just recently start that?

[@juanchoman9824]

@@dragsterstransmissions no it's been like that since I got it a year ago

[@jorgelugo1443]

Where does the vacuum line come from because mines missing?

[@dragsterstransmissions]

@Jorge Lugo there should be a vacuum hose fitting behind the carburetor in the intake manifold.

[@chrismcglumphy93]

This is the answer I was looking for. Thanks for the informative video

[@maniacalmonster2293]

mine shifts early and soft with odd downshifting. Is there a modulator on a 2004 Jeep Grand Cherokee Laredo WJ 4.0??

[@dragsterstransmissions]

No A transmission control is used in all the newer vehicles like yours

[@THE-REDNECK]

Got a question for anyone that sees this, my vacuum modulater went out and lost 3rd gear, then i replaced it fixed that issue now my kickdown wont work when i gun it hard also doesnt shift like it used to any more it feels like it shifts way to late any suggestions

[@dragsterstransmissions]

Remove the governor and make sure it's working properly. I have videos in my playlists titled "turbo 350" were I explain what to do

[@carllattimore8227]

Why is there a light shining under your car........yep I have had that happen a couple of times lol!

[@luishetzler9429]

Can i adjust VM to shift 2 gear chrip it did before i replace old one

[@dragsterstransmissions]

@Luis Hetzler There is a adjustment screw in modulator that takes a small flat screwdriver. Turn it in to make firmer shifts. If you want to "chirp" the tires on the 1-2 and the 2-3 shifts I suggest removing the valve body and in install a shift kit

[@tysimpson3417]

Question, I have an ‘84 1 ton Scottsdale with a 8.1 vortec and a TH 400 and it shifts through all three gears before I hit 15 mph. Where can I get the springs to run each gear longer.

[@dragsterstransmissions]

Order a transgo kit for the 400 trans. Get the pro kit. It will say pro at end of part #. It comes with a bunch of parts to upgrade your valvebody including the governor springs. 4 sets I believe

[@dragsterstransmissions]

What gears are you running

[@dragsterstransmissions]

Also your engine combo might have something to do with it. Start by testing vacuum modulator. Remove it and apply vacuum

[@tysimpson3417]

It is a brand new monster transmission I told them all the details, but they have been less than desirable through this whole process. My old TH400 did this also, 456 gears. Do you think it’s PullIing to much vacuum

[@dragsterstransmissions]

@@tysimpson3417 where are you located

[@rangeyou99]

would this help with first gear take off or slipping feeling?

[@dragsterstransmissions]

@rangeyou99 No sounds like the tranny is hurt and needs to be completely gone thru and rebuilt with a fresh torque convertor. What state are you located??

[@rangeyou99]

@@dragsterstransmissions southern California.

[@rangeyou99]

@@dragsterstransmissions but im not even 100% sure this is the transmission i have, i think it is, i have a 1986 pace arrow rv class C 454 chevy. might be an expensive tow, was thinking of trying to pull it myself but seems like a big job for someone with few basic tools.

[@dragsterstransmissions]

@@rangeyou99 that's a bit far from Virginia.

[@dragsterstransmissions]

@@rangeyou99 yes lm positive it's a turbo 400. Are you sure the fluid level is right? Also the tranny has a big brake drum on the rear that's the parking brake. Make sure it's not stuck

[@mannypantoja3846]

So if mine is shifting to late , do I turn it clockwise ?

[@dragsterstransmissions]

Counter clockwise

[@alejandrocovarrubias428]

Where does the vacuum conects to

[@dragsterstransmissions]

A vacuum source on the intake manifold or a full time vacuum port on carburetor

[@yamahaguy1732]

How do you hookup a kickdown for one of these I heard that they are electric is that true or is it like the th350 kickdown

[@dragsterstransmissions]

350 trans has a cable for the kickdown 400 is electric located on driver side just above pan. However up to 45ish mph the 400 detent/passing gear works off vacuum through the modulator valve.

[@dragsterstransmissions]

Question was your vehicle originally equipped with a 400 trans?

[@yamahaguy1732]

The Dragster Shop Life I don’t believe so I’m assuming they threw it in with the 396

[@yamahaguy1732]

The Dragster Shop Life I’ve seen some kits you can buy that go on the side of the transmission it’s like a little box and it’s got a line like a normal kickdown that activates the electronic kickdown when pulled

[@dragsterstransmissions]

@@yamahaguy1732 look above the throttle pedal on the rod holding the pedal is there a little plastic device?

[@MrBigshnizzle78]

I have a th400 and shifting is both hard and quite long, like very long

[@dragsterstransmissions]

When you go from park to reverse or drive is it slow to engage? In other words does it take awhile to grab?

[@TheMrJones1994]

The Dragster Shop Life I have the same thing going on as him but it does grab reverse good. Low to second is super slow same as second to third

[@dragsterstransmissions]

Disconnect lower cooler line at radiator/cooler and drain into a catch pan. Have someone start engine. If fluid is pumping out slow it needs a rebuild and a fresh converter

[@dragsterstransmissions]

@@TheMrJones1994 also make sure it's the lower cooler line coming from the trans to the lower port on radiator

[@xXxCrazyJay810xXx]

What if you dont feel any shifts?

[@dragsterstransmissions]

That could be caused by several possibilities. What is it doing exactly?

[@xXxCrazyJay810xXx]

@@dragsterstransmissionsstarts fine drives ok I can go 70mph 80..and seems to rev alittle high but I dont feel or hear any shifts it's a TH400 Transmission

[@dragsterstransmissions]

@@xXxCrazyJay810xXx when you shift from park to drive or reverse is it kind of slow to engage?

[@xXxCrazyJay810xXx]

@@dragsterstransmissions it engages doesn't have any take off kinda slow and then it's like no shifts kinda like its 1 gear only like maybe in 3rd because if I try to go over 80mph it revs higher

[@AlexGerling]

My transmission is going into neutral when heading to a stop nd then it will be hesitant to get into drive nd when the car hasn't been used in a few hours especially cold it doesn't want get into drive or hesitant to get into drive nd I'll hear a groaning noise when turning in 1st nd sometimes it'll shift into a second at low rpms nd it didn't do that before im not sure wat it could be I check the fluid nd its at the line nd i know i changed the filter when we got the car on the road so im not sure wat else it could be

[@dragsterstransmissions]

Sounds like poor pressure. Alex Gerling Most likely will need a complete rebuild. What state are you located in?

[@AlexGerling]

@@dragsterstransmissions I'm in Florida

[@dragsterstransmissions]

@@AlexGerling ok I'm in Virginia. I've got other videos in my playlists titled "turbo 400" "Turbo 350" Hope these help and thanks for subscribing to my channel

[@AlexGerling]

@@dragsterstransmissions alright very much appreciate it

[@dragsterstransmissions]

@@AlexGerling if you was close I would build it but I think shipping might be pricey from Florida to Virginia and back

[@jeffjeff4477]

Good video My 69 Eldorado shifts hard from Park to drive Modulator??

[@dragsterstransmissions]

@jeffjeff4477 Where on your engine is the modulator line connected? Or start by checking all vacuum lines for leaks

[@prestonboling1427]

does this go for every vacuum modulator? i have a 4l60 in my top swapped buick regal and the shifting just isn't there. shifts feel super slow and i feel like i just get a really big drop in power whenever it does shift . not like it shifts at a high RPM it like just feels like it takes forever to finish shifting once it starts

[@dragsterstransmissions]

4L60 does not have a vacuum modulator. Early 4L60 trannys use a cable to control pressure throughout tranny.

[@prestonboling1427]

@@dragsterstransmissions 4t60 not 4l60 sorry i haven't done all my research haha. i believe i've got one down under the air box. it's got a vacuum line running to it which ties in with the TB then the fpr

[@dragsterstransmissions]

@@prestonboling1427 ok yeah that's a totally different animal. It the check engine light on?? What year is the car??

[@prestonboling1427]

@@dragsterstransmissions it's a 96 regal and no i don't have a CEL but am still trying to adjust shift points and stiffness and so on

[@dragsterstransmissions]

@@prestonboling1427 probably needs a new TCM it is located on top of tranny towards firewall. Shifter cable is attached.

[@markproductions806]

I change Modulator because when shifting My car bog like the cable is setting but still the same problem with the new modulator.any tips ?

[@dragsterstransmissions]

What Transmission do you have?

[@dmitrieco]

HI, please tell me I have a 3-speed transmission when picking up speed in third gear on a straight road or up I press the pedal very slowly and the transmission immediately switches to second speed, I don’t want to accelerate at a third speed only when moving down, please help if you know and want, thanks!

[@dragsterstransmissions]

I think I understand what you're saying. So if you push the throttle easy it should downshift to 2nd. If you push on the throttle pedal hard it will downshift to 1st. Try that and you will tell a difference in engine rpm

[@brockmotorsport3807]

Why bother :o). Awesome vid!

[@champking20]

Would this be the cause of my 76 stalling when putting it in gear?

[@bostonhall]

I would try tuning the carb first, I found that removing my emission things made a difference, but more likely than not your carb may just need a tune up.

[@timbryant7088]

Why is there no video? Audio only.

[@benjaminricketts2199]

Sounds like a device problem. I've got a video, and I'm using my phone

[@jasonlynch16]

The video is blacked out

[@dragsterstransmissions]

I just watched it seems fine

[@rowdyscooter5228]

MY ..400 ..TRANS ..WONT . FORWARD ..AT ..ALL ..! .. WILL...GO. REVERSE. !! .

[@dragsterstransmissions]

@Rowdy Scooter It probably needs a rebuild but pull the governor out and look at the gear on it. Check out my playlists titled "turbo 350 transmission". I've got videos in there titled "governor". Thanks for Watching and subscribing

[@dmitrieco]

unfortunately, there is no rpm, but from a speed of 50 to 60 mph needs to keep the third speed on a straight road, but with the slightest pressure on the pedal it immediately switches to second gear, which should not happen, I cannot accelerate!

[@dragsterstransmissions]

Did you get it figured out

[@dmitrieco]

No, Garage Mechanic gone check my transmission

[@dmitrieco]

Thanks

[@dragsterstransmissions]

@@dmitrieco what transmission do you have turbo 350 or 400

[@dmitrieco]

No 6.2 GM diesel

[@theofrancis3803]

Sorry accidentally hit the unlike button

[@kennethharms7503]

Thank you