How to Convert Dodge and Jeep 45RFE to 545RFE Automatic Transmission (4 to 5 Speed Conversion)

This is the easiest transmission conversion you will ever do and I will also show you how to find out what transmission you have now without even looking at the transmission. This is a great video on how to replace the Transmission Control Module TCM/TCU.
Here is the part number for the 545RFE TCM 56044574AC
Chrysler Build Sheet fcacommunity.f... Enter the VIN as it appears, case sensitive.
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#martinbuilt #jeepgrandcherokee #jeepmods

[@charlesgrimm7382]

I did this in my 02 dakota. One of the easiest and cost effective upgrades for the vehicle. Been using a gc tcm in dakota for over ten years no issues whatsoever. Lower rpm in top gear. Final drive changes to .67 to 1. Lowers by about 150-200 rpm on hwy. Plug and play. Once u begin driving and the speed sensor picks up,, the gauges work properly. Martin u r the man.

[@tysauce1986]

So there's no need to reprogram anything anywhere?

[@orangejuicewithpulp403]

did you get any mpg improvement? does it effect towing?

[@gc299]

I am so thankful for your video on this upgrade. My local Dodge dealership was not much help when I asked them about this conversion. I have a 2001 Dakota 4.7L 45RFE 2WD with 3.92 gears, lowering highway RPM would be great. I installed a TCM from a 2003 Grand Cherokee 4.7L 545RFE 4WD, no problems at all and an instant 5-speed. Highway RPM dropped by 300-400, this made a big difference with 3.92 axle ratio. The TCM part number I used was 56044574AB. Thank you!

[@martinbuilt]

You are very welcome. I'm glad to hear it all worked out out for you. I personally saw a 2 MPG increase.

[@rodom303]

Glad I saved myself some projects by buying an H.O with the 545

[@goosevamtb]

I completed my TCM trade yesterday (2002 Dodge Dakota Quad Cab 4x4 w/ 3.55 gears and 265/70-16 tires). I used an '04 Jeep Grand Cherokee TCM that I bought on eBay for $40 including shipping. Local salvage yards were $50. Let me be clear - I am beyond pleased! This changes the drivability of the truck so much that this change should be required by law. Everything worked and shifted smoothly except the 2-3 upshift. This was very hard and harsh. I went through the relearn procedure and by shift around 10 shift cycles, this shift was normal. The button on the gearshift continues to stop the transmission at 3rd gear. On the highway, once I get to around 55 mph, the transmission is in 5th gear and the torque converter locks. This is where a HUGE difference is seen in the behavior of the transmission. Formerly, when at cruise speed and going up hills on highways, very little throttle increase was allowed before the transmission went from 4th gear and locked TC to 3rd gear and screaming RPM. The TCM simply would not allow the V-8 to use it's torque. NOW, a much greater amount of throttle is allowed in 5th locked and most hills are climbed at cruise speed with no downshift. Once a downshift happens, it is to 4th unlocked and the truck climbs away. This is a very welcome change. The truck is also noticeably quieter at cruise. I have not checked the fuel economy improvement yet, but based on the changes I have seen, I feel like Martin's results are reasonable.

[@martinbuilt]

I'm glad it worked out for you. It sounds like you're very pleased with the results. And for $50 going from a 4 speed to a 5 speed, I'd say that's a pretty good buy. I appreciate you posting your findings and sharing with us.

[@wadet73]

Just ordered a TCM from a 2004 ZJ 4.7 for my 2001 Durango SLT Plus 4.7 from eBay. It should arrive early next week 😊

[@BANDIT198455]

That equipment listing service is just what I needed. Thanks for the info. My jeep already has the 5 speed and gets 19 to 20 mpg so I am good. 2003 jeep grand Cherokee limited. Love the jeep.

[@martinbuilt]

Thank you, I'm glad you found it helpful.

[@vr4787]

I sold traded in my Dakota in August, but I keep coming back to watch, guess I still have a soft spot for 4.7s & 545RFE.

[@martinbuilt]

Thanks for watching, I've been looking for a Dakota.

[@trentmoseley]

Definitely gotta do this to my 99. Lord knows I need more gears with it. I was getting 12 to 13 mpg doin 70. Thanks so much for the great vidjas.

[@martinbuilt]

Any time!

[@versionvisual]

@@martinbuilt Greetings from Monterrey, what good videos, what part number should the tcm have to get fifth speed, my grand cherokee is 99 power tech 4.7 v8 transmission 45rfe

[@martinbuilt]

@@versionvisual 56044574AC this number is from my 04 Jeep Grand Cherokee with a 4.7

[@myownm8898]

@@martinbuilt what about the part number for the Dodge Dakota? Mines an “02”.

[@EvanHartenburg]

There is actually a TSB to upgrade the 45 to the 545, I took my 99 to the dealer and had them update the tcm no problem, now I have 5 gears!

[@martinbuilt]

I wonder if they will still do it now that these vehicles are 20 years old

[@phillanassa759]

@@martinbuilt As long as you're willing to pay for it, sure no problem. We typically charge 1.0 hours labor, unless it's an internal update ( like a recall, but not published, and falls inside the date parameters Chrysler set forth). I did the flash about 14 years ago to my 4.7 Durango 4X4 SLT 4WD, which I still own and have owned new since 2001. In the last 6 years I added 2 4.7 WJ's 4X4's to my stable of vehicles. Love those 4.7's love the channel and content!

[@Carlos-ip2ir]

I'm getting alot of psi codes to high to low and also getting over heat at 240 shifting but feels good and never seen the transmission light

[@phillanassa759]

@@Carlos-ip2ir Transducer or harness/solenoid/sensor issues inside the trans or a bad connection at the trans case is where I'd look. Start with the lowest code number, run the diagnostic chart instructions, don't skip any steps, then work your way up through each code.. example, start at code P0740, then P0741, P0785 and so on low to high. It might be one issue causing a cascade of issues because the components share something, such as a power or ground, or data line to the computer. Hope this helps.

[@elsydeon666]

The HO engine also says "High Output" on the resonator. It's not perfect, as it can be swapped, but really easy and works if you can't run the VIN. I discovered that since I got a 02 Overland a few days ago and the 4.7 HO is the only engine option for the Overland. I love it, despite the transmission being stuck in limp mode.

[@mikeevans7411]

Just did this on my 99 wj 4.7, what a difference Martin is right changed rpm at 70 mph from 2400 rpm to 2000 rpm. cool up-grade. took 30 min from the time I opened tool box till the time I closed it. used 2002 tcm. Thanks martin.

[@martinbuilt]

That is awesome, I'm sure your MPG will improve as well. I Will be doing this on my 01 Dakota

[@miguelsagal92]

Are you getting hard 2 to 3 shift?

[@martinbuilt]

@@miguelsagal92 I recently starting getting that but I still have the 45RFE TCM.

[@miguelsagal92]

@@martinbuilt I had really hard 2 to 3 shifts right after swapping tcms. Came upon a forum where a guy said the transmission needs to relearn the shift points (I have 4.56 gears, probably didn't help). Lucky for me I work at a Chrysler dealer. One of my techs plugged in a 90s looking huge scan tool. Reset it, and she shifted super smooth. Leaving it here just in case someone runs into the same problem.

[@sebastianmakowski2421]

Thanks for the great videos. They helped me out many times likewise understanding my jeep better. Keep up the good stuff! Greetings from Hamburg, Germany and happy thanksgiving.

[@martinbuilt]

Glad to help, and a Happy Thanksgiving to you and yours.

[@jonxanest9151]

I love your channel, you do everything the way I like to work on my 1500

[@martinbuilt]

Thank you, I really appreciate that.

[@TheSnup23]

Привет из России! Вы делаете хорошие машины! Мартин, спасибо за видео! Мы давно уже так ездим, меняем "мозги" и наслаждаемся) Спасибо!

[@Dieselpwr]

Good to know makes shopping for a transmission for my 2011 grand Cherokee cheaper

[@KJsProjects]

Love D&E. Another great KZbin channel.

[@martinbuilt]

Yes it is!

[@owenjames3570]

Super cool 😎 builds! I'm learning lots of new tips and tricks!

[@martinbuilt]

Thank you, glad you liked it👍

[@bigwalt639]

Thank you for putting in love on these motors

[@martinbuilt]

You are very welcome 😊and there's much more to come 😀

[@WJsLifeonaBoat]

Hey Martin, happy Thanksgiving. On your test drive, it is 1st, 2nd, 3rd, 4th, TC lock, 5th.

[@martinbuilt]

Happy Thanksgiving

[@arizonaguy7574]

Happy Thanksgiving wishes coming your way to you and your family Martin. Thank you for taking the time to post this video.

[@martinbuilt]

You are welcome and a Happy Thanksgiving to you and yours.

[@peterperez3265]

My friend you are the man, thanks a lot.

[@martinbuilt]

Thank you, I'm glad you liked it and found it helpful. Have a wonderful Thanksgiving

[@leonardofranceschini423]

I do this to my Dodge durango 2001 4.7 and i make roadtrip from central florida to North Carolina and i spend 4 full tank for go and comback to my home $320 gasoline. is incredible for me. the tcm give me 19 to 20 miles for galon. the original tcm give me only 16 miles for galon.

[@robertcasianosr]

So I got a 02 Durango....what am I looking for if I want to make this upgrade??? I'm lost!!!

[@elsydeon666]

Mopar sales codes will also tell you if the original buyer was special. My 93 Cherokee was originally sold to a retired Chrysler worker as part of a special employee program. I almost bought a minivan that was originally sold to State Farm, as a number of large companies have their own sales codes, including rental companies.

[@martinbuilt]

yeah, it a very helpful website

[@JohnnyHotspurGT]

Happy Thanksgiving to you and yours Martin ! Great informative video

[@martinbuilt]

Thank you and Happy Thanksgiving to you and yours as well.

[@mohamedalibenattia4298]

Thanks Martin for everything great videos ! Mohamed Ali from Tunisia owner of a GC WJ V8 4.7 2000’ now i ve got some issues with the PCM, engine crank but no start there is no more connection between the OBD and the PCM (dead).

[@nexus0038]

Good video Martin 👍👍👍

[@martinbuilt]

Thank you!

[@justScrollin0627]

Happy Thanksgiving 🙏🙌

[@martinbuilt]

Thank you, and a Happy Thanksgiving to you and yours.

[@tysauce1986]

en.m.wikipedia.org/wiki/Chrysler_RFE_transmission Here is a list for anyone wondering where to get a donor TCU. By the way, after watching your videos I bought a set of the fingertip ratchets from harbor freight. They sat in my tool box for a while. But after using them once or twice I realized their potential. They are awesome and extremely versatile. Thanks for all the time you spend getting great camera angles and including all the relevant information including tool sizes and torque specs etc.

[@martinbuilt]

I'm glad those finger tip ratchets are working out for you.. And thank you for posting the link some good helpful information there.. Yeah I try to get the best camera angles and make sure there's proper lighting. 😎

[@danhambrick6331]

Nice job Martin.Thanks for the link.....

[@martinbuilt]

No problem 👍 Happy Thanksgiving to you and yours!

[@danhambrick6331]

Happy Thanksgiving Martin.....

[@OCmeiwaku]

my two dodges 02,08 do not have transmission modules, after 2002 most of them dont... is that correct ?

[@DavidSanchez-ib4ft]

I meant to post this when your video popped up. You may still be eligible for the recall that Jeep did to update the TCM software. Mine was done on 01/30/2001 recall 882 dealer code 68208(that may just be the dealer that did it)

[@DavidSanchez-ib4ft]

That's for anyone who may still be running the original software from Jeep.

[@martinbuilt]

I doubt if you haven't taken in the Jeep for the TCM update after 20 years, you won't be able to get it in now.

[@xc8487]

I did this on my 2002 Jeep Liberty.

[@rono3045]

I've got a 2001 Dodge Dakota with a 4.7 I got into an argument years ago with a supervisor at a transmission shop I told him that I've got a five-speed he said no you don't That's the torque converter locking up and unlocking

[@martinbuilt]

He was right the 01 Dakota has the 45RFE

[@goosevamtb]

Great video, and very much appreciated! I have a couple of questions: What do the individual manually selected gear positions on the dash become after the change? And what does the O/D Off switch on the end of the gear shift do after the change?

[@martinbuilt]

Thank you, I'm glad you liked it. The manual gear selector will not change. 1st is 1st, 2nd is 2nd, and overdrive is still the same. On a steep hill, it will still shift into 3rd but on a not so steep hill, it will shift into 4th. I will have to check to see what happens when you turn off the OD.

[@goosevamtb]

@@martinbuilt Thank you for helping me!

[@captaincommando9911]

Martin, you produce great videos, one of the few resources for the (underappreciated) 4.7 engine but a great one. I have read in some of the Dodge/Jeep forums that doing this TCM/TCU replacement for some earlier vehicles (maybe 2000 and earlier for Dodges) with the 45RFE will result in many thrown error codes and dashboard trouble lights. That is why I haven't done this mod for my 2000 Durango with the 4.7 engine. Do you know if this is the case? I believe this issue may be related to the switch from JTEC to NGC ECUs (although I think that switch happened in different years for Dodge and Jeep). Thanks!! Again, please keeping making these great videos.

[@P.A.C.E.automotive]

Apparently the 4 to 5 speed TCM swap does work (successfully unlocks the 2nd overdrive) on the JTECs but you get error codes and the odometer glitches out. I never converted my '00 Dakota because of the uncertainty but had flawless success on my new '02.

[@captaincommando9911]

@@P.A.C.E.automotive Yes, you have stated what I thought was the case with the JTECs and why I haven't tried this with my 2000 Durango. Curious if anyone has come up with a fix to remove those issues with the JTEC. I assume it would need to be a software fix, so it is not something I could handle. There must be someone who would like this challenge.

[@ElvisAbdi]

Bonjour Martin, Very good video, thank you! I have a question for you and for all viewers: My JEEP Grand Cherokee WH/WK 5.7 4WD (10/2005) has 545RFE tranny with a lot of problems, according to my local transmission specialist (in FRANCE), my 545RFE needs full revision (valve manifold replacement, torque converter replacement, all seals etc...), they ask 5000€!!! it's just huge so no way for me. I decided to buy a used one, very difficult to find 545RFE here in France but I have a possibility to buy a 45RFE transmission! So my question is: will it fit on my JEEP with my original TCM from my 545RFE? will it have 5 gears or still have 4 gears? I'm wondering if this is good idea or I should try to find 545RFE instead off trying to transform 45RFE to 545RFE? Please let your comments it's very urgent for me Thank you and regards from France

[@gfysyoutube]

Very nice any suggestions on what part # to switch my 2002 Dodge Ram 3.7 2wd to the 545RFE

[@martinbuilt]

P56044574AC

[@mediaman3749]

Would be nice Martin to have shown the two differnt part numbers ob the GECU.

[@haylspa]

part numbers 2002 56044574AC the 2003-2004 is P56044574AC same just a P in front of it. you could do it with an 2001 as well but would have to flash the ecm, so best to stick with the part numbers I gave you

[@jarekr77]

Hi, I checked my jeep on the page you gave and it turned out to have a 4-speed gearbox "4-Spd. Automatic 42RE Transmission" I have a question. Will the replacement of the driver in my case also work?

[@martinbuilt]

This mod is for the 45RFE trans. You most have the 4.0 or a 5.2L engine.

[@jarekr77]

@@martinbuilt yes i have a 2004 jeep grand cherokee wj 4.0. a great pity it won't work on my jeep

[@winstonemerson2439]

Another great video.I have a 545 rfe in a 2003 Dakota.I'd love to convert it from column shift to floor shift but can't find anyone that has done it.Any idea how I would do it or what parts I could source to do it.Thanks again for the great videos.

[@martinbuilt]

Considering the same thing and was kind of wondering how a grand Cherokee WJ console would fit.

[@goosevamtb]

The Jeep TCM still delays the 1-2 shift until 12-16 mph, just like the original TCM.

[@crisemenzato]

Good evening, my name is Cristiano Semenzato and I live in Brazil. I bought a Dodge dakota v8 automatic with a Magnum 5.2 engine. it caught fire in the harness and the injection module (tcm). I would like to know if you can get a module, because I saw your video changing the module and installing the five-speed. I appreciate if you can help me, may God bless you, hugs.🙏  Feedbac

[@sdavrider]

0:22. This video is incorrect. This Jeep TCM swap doesn't work for 99-2000 45RFE equipped vehicles. The TCM is unable to sense engine load from the ECU preventing the transmission from shifting smoothly. Ask me how I know. However, this swap is known to work in 2001-up non-Jeeps.

[@mzwandilenzimande4621]

I have a question to Martin and all the viewers of this great channel. It appears the WK and XK also had the 4.7 with the 545RFE, however it also had "tiptronic" manual shifting. How would you go about adding this kind of manual shifting to the WJ's 45/545RFE and could you program a switch to change the function of the back steering wheel buttons to be your upshift and downshift paddle-shift commands? would appreciate any feedback.

[@martinbuilt]

Yeah, I've actually thought of that before as well, but I've got so many other projects I'm working on.. It would be really cool to have some type of paddle shifter, but that is currently beyond me.

[@cronkthecrunk]

Ok, I've had the PCM/TCM replaced in mine so I don't think the website would help... so I'm wondering if I have 33s on it with no speedometer adjustments would that test still work the same? I took it up to 70 on my gauge (which is like 80mph) and it was just above 2k and I have also used a GPS and it was still just above 2k 🤔 trying to figure out if it might of had the upgraded TCM thrown in

[@1crazynordlander]

I had a 01 Jeep Grand Cherokee limited given to me this past weekend. It's not in the best of shape but it runs and drives. No burnt smell in the transmission fluid but I doesn't shift into 5th or lockup. I need to read the codes as the check engine light is on. You seem pretty faithful to your 4.7 L Dodge engines. This unit will not start on occasion either. This unit is pretty stock yet. I am hoping I can get the trans figured out because free is good right?

[@martinbuilt]

Yeah I wouldn't turn down a free Jeep

[@dannyw7662]

Can anybody answer this situation. I Hava an 04 grandcherokee limited. I used a launch crp129e scanner and it only shows 4 gears and lockup. What to check? Pn on tcm? Thnx great channel

[@dannyw7662]

So what I found was 5th gear does not come in until 55+ mph

[@dannyw7662]

What do you think about using the Michigan motorsports line pressure booster?

[@martinbuilt]

If it works, it's a good deal for $17. The way they describe it. It seems more of an application for a high performance engine to help give you a higher clamping force to the clutches. Not that it's gonna make the transmission shift any faster. amzn.to/42OLsaY

[@derange12]

Would i need to program it?

[@markmartin3152]

I have a 2002 Dodge Ram 1500 4.7 and Chrysler build site says I have 45rfe. I obviously want the upgrade to save gas but everyone says online I already have it because it’s a 2002. Don’t know what to do and want to save that gas on highway…….

[@martinbuilt]

If the build sheet says 45RFE then that's what you have unless it had gone to the dealer and they did a upgrade on it from the previous owner. For around $40 to buy a TCM I would go ahead and do it.

[@markmartin3152]

Thank you for your reply, I will now be hunting for a 2003 transmission control module so I can save that gas, thanks again brother

[@asapcornerstone7851]

I’m really surprise that your transmission is not slipping . Because my Jeep Grand Cherokee 2004 was slipping bad through 1 first and second and my Jeep was stock

[@DakotaJaegle]

bad transmission maintenence

[@asapcornerstone7851]

@@DakotaJaegle I mean I was the 3 third owner and I got it with 174,000 miles but that’s normal for it to slip at high miles people where saying and I tired my best to change the filters and fluids and sensors eve the solenoid pack and still slip bad and the TCM computer

[@Tijuzu]

So.... am I understanding this correctly? I might sound like an idiot but are you saying that the only difference between the 45rfe and the 545rfe is software?? Or are you advising that if you want to swap to a 545rfe all it takes is swapping the trans and that TCM

[@SkylineFTW97]

The 45RFE and the 545RFE are physically the same transmission. Both are actually 6 speeds, but 1 of those gears is an alternate 2nd gear for downshifting. The "5th" gear just wasn't used in the early models for some reason, but you can change that by putting in the updated TCM.

[@Tijuzu]

@@SkylineFTW97 thanks! That's what I was trying to wrap my head Around... it makes no sense that they'd put the gears in there but not have them accessible for use. Wild

[@SkylineFTW97]

@@Tijuzu Kinda silly that Chrysler did that. I would've just made it a full 6 speed and used the marketing to boost sales and tweak it to improve MPG, which could also boost sales.

[@IOwnCalculus]

@@SkylineFTW97 Yeah, it's a peak Chrysler being Chrysler moment when they build a six speed automatic and release it as a four speed. The 65RFE is the exact same transmission again, just with the programming and naming changed so that there's a proper second and third, instead of second and second-prime.

[@davestewart9146]

Great information Martin and happy thanksgiving to you and your family 👍😁

[@martinbuilt]

Thank you, and a Happy Thanksgiving to you and yours!

[@clintbailey8220]

That's awesome thank you for the link, it's very helpful for my 00 Dakota quad cab sport 4.7 manual.

[@tracysellman1562]

Ok, did I miss something are you changing out the whole TCM with a NEW one or did you just have it reprogrammed with the updated software? The reason I ask is that in your video you say a SOFTWARE replacement which is just that, a software ( computer program ) Not the whole Hardwear replacement which would be the complete TCM, the case with the circuit board. Sorry just trying to clarify this, but other than that good video.

[@martinbuilt]

yes replacing the TCM with one from a vehicle that had the 545RFE. What I was saying is that Chrysler did a software upgrade to get the 5th gear in 02. The trans is actually capable of 8 forward gears and 3 in reverse, if only we could find someone that could right the software for that.

[@rosebruns7946]

Wonder video Martin / I have a 2000 4.7 JEEP. You sure no your engine/ what kind of spark ignition coils would you recommend for this engine/ my 1&8 seems to give out. THANKS

[@martinbuilt]

These have a good review single-coil amzn.to/3wSXqAc Full set of 8 amzn.to/2U1EJeT

[@mrmo666]

Hey Martin, good video. I noticed your abs light was on, you have a dirty or bad abs sensor?

[@martinbuilt]

Thank you, yeah I need to check that out, it comes on and flashes, then goes solid but doesn't come on all the time and also goes off some of the time.

[@e.g.24hrs54]

@@martinbuilt I have the same problem on my 2002 Dodge Ram 1500. I’ve noticed the light likes to come on when it’s raining or humid out. Also when I drive over railroad tracks. It might be a pinched or exposed wire. Please give us an update on what you find out.

[@rlld23]

The 45rfe and 545rfe are the same transmission minus the software. The 545rfe can be transformed into a 6 speed with a software upgrade. I was wondering if the 45rfe could also be turned into a 6 with the software update?

[@martinbuilt]

should not be a problem since there the same transmission.

[@lucasemery7331]

So will the end 2000 2001 model year have the correct TCM

[@SmudgyContent]

Yeah someone in the Dakota group on Facebook sent me that link and I was never able to find my truck

[@martinbuilt]

that's odd

[@rustyshackleford2731]

Be sure to use capital letters or it won't find your VIN.

[@martinbuilt]

@@rustyshackleford2731 Thank you, that is a great tip.

[@jorgeptorrico]

Hola, hice lo que dijiste en el video y se daño la caja.

[@mistermusik]

Going to try this. I have an 08 Liberty 4x4. I like it, it serves me well, but man the 4spd auto just feels weird and the mpg sucks. 18 hwy. :( Hope this works. 👍

[@martinbuilt]

You have an NGC ECM that means the TCM is built into the ECM and you should have a 5-speed transmission already. Most 2002 and all 2003 and later had 5-speed transmissions.

[@mistermusik]

@@martinbuilt Thanks for the reply! I checked the build sheet site linked in the description. Says I have the 4-spd. Automatic VLP 42RLE Trans. Most everywhere I've looked says the 08-12 Liberty came with either 6spd manual or 4spd auto. Where would I look to find out about NGC ECM? Or does this video only apply to those who have the 45RFE?

[@martinbuilt]

@@mistermusik Yeah this only works on the 3.7 and 4.7 engines with 45RFE transmissions

[@jbzip64j]

The second overdrive is weak. I have a 03 Ram with the 545. That second od isn’t very strong. I’d like to convert to 8

[@martinbuilt]

when you figure that out let me know.

[@franciscobeattie9798]

I got a question, my 99 dakota has the 46RE, can I replace it with the 545RFE? Thanks appreciate it

[@martinbuilt]

Your Dakota must have a 5.2 or 5.9 They never made a 545RFE that would bolt to a 5.2

[@franciscobeattie9798]

@@martinbuilt it has the 5.9

[@reyg23]

Does it matter if its a 2wd or 4x4?? Thank you love your videos

[@martinbuilt]

Thank you, no it does not matter. You could use a TCM from a 2wd and install it in a 4x4 or vise versa and it will work.

[@reyg23]

@@martinbuilt thank you soo much keep up the great videos im a new subscriber and love your videos

[@mike_lee]

I cannot wrap my head around getting lower RPM's on the highest gear. As I understand it, the old TCM does something like this: shifts from 1,3,4,5 and if uses 2 when downshifting. The New TCM does this 1,2,3,4,5. If the 5th gear is exactly the same ratio, how is it getting lower RPM at 65mph? Can someone explain this in layman's terms?

[@martinbuilt]

It is not the same ratio as 4th gear this is an additional gear within the transmission. It is actually capable of 8 forward gears 3 and reverse. Too bad there isn't someone out there that knows how to program the other gears into the TCM.

[@mike_lee]

@@martinbuilt So you are saying there are 3 (not counting the reverse) gears that is not being used? Wow. Thanks.

[@martinbuilt]

@@mike_lee Yes that is correct the other 2 gears would be between 1 and 5

[@mike_lee]

@@martinbuilt Ok, I'm back. Been doing more reading/researching, and seems some are reporting mixed results. Any thoughts on a 2000 4.7L Durango SLT+, optioned out with Full time 4x4, with 3.55 gear ratio?

[@bigrus0141]

Unhook the battery before doing this correct ? I know some stuff you don’t need to unhook it so I want to be sure

[@martinbuilt]

I'm sure that is what is recommended by Chrysler but I never have when doing this.

[@jonesing4life126]

What make/models should I be hunting for the 5 speed

[@martinbuilt]

As far as the Grand Cherokee goes I would be looking for the 03,04 Jeep Grand Cherokee with a 4.7 That same TCM will work in a Dakota, Durango and Ram

[@olivier8384]

Hello Martin, very good video and very well explained. I've been following you for a little while now because your videos are really great and explained things to you with such simplicity that everyone can understand. I did not see the link for the box appear in the video you could join me in the answer? What if by chance you don't have the number of the module that you put? Thank you Sorry my English is maybe not very good, I am French and Google Translate is my friend !!!!

[@martinbuilt]

Thank you, Here is the part number for the 545RFE TCM 56044574AC. I always have additional information in the description.

[@olivier8384]

@@martinbuilt Hello Martin and thank you for your answer. I have a TCM which was sold to me for a TCM of 545 RFE now according to the N ° 56041814 AD I do not know if it is really a TCM of 545 RFE and from which vehicle it comes, I cannot find not the correspondence of the vehicle on the internet? Will you have a way of knowing from the number of which vehicle it comes?

[@martinbuilt]

@@olivier8384 yes that one is from a 99-2000 Jeep Grand Cherokee. It is a 45RFE TCM

[@olivier8384]

@@martinbuilt A big thank you Martin for the information !!!

[@goosevamtb]

Another question - my 2002 Dakota has a light throttle 1-2 shift point of 16 mph minimum when cold. If I'm starting out on much of an uphill, the 1-2 shift point might be 20 mph or more. This lowers to 12 mph but no lower when warm. Will the Jeep TCM lower the 1-2 shift point? It would be wonderful if it did. And it downshifts into first gear at 12 mpg, too, when a V-8 should have plenty of power to just stay in 2nd gear.

[@goosevamtb]

To be clear, it is the 4.7.

[@martinbuilt]

I don't know about all that with the up-and-down shifts in 1st and 2nd if it is affected or not. I was just thrilled the fact that I got another gear out of it and that my gas mileage went up for less than $40 investment you cannot beat that.

[@mosesromero6084]

Where can I get the tcm? I pull my camping trailer with my 2000 wj jgc limited v8 4.7 this would really help for towing

[@martinbuilt]

It will definitely help with towing I've been recently towing with my Dakota and I can definitely tell it helps on the hills. I may have a TCM if you're interested.

[@jorgeptorrico]

Hey Martin, do you know the part Number for a 545RFE TCM in the mopar Parts web have 2 part Numbers. I don’t know the diference

[@martinbuilt]

what are the 2 part numbers?

[@burtcooperphotography7756]

I'm getting ready to do this mod this week and have a question. I'm presently running a Superchips Flashpaq f5 3845 tuner on my Dakota set up with the 91 octane performance tune. Should I reset the computers back to the stock settings before installing the 545rfe tcu, and then reinstall the 91 octane performance tune after the tcu install, or does it matter?

[@martinbuilt]

If the tuner has any transmission performance upgrades then yes I would return it to stock and then installed the 545rfe TCM

[@burtcooperphotography7756]

Awesome! Thanks for your response! Your videos paired with Airram.com 's products are quickly turning my 240,000 mile Dakota into a beast! Drive ability, mileage, horsepower, and torque have greatly improved with the work I've done so far!

[@joaoboia7837]

Hi Martin, I have a 2000 WJ 3.1 Diesel with 42RE Transmission. I only have 1, 2, 3 and O/D. Can I upgrade my TCM with the 545RFE TCM? Regards. Thanks for the tips!

[@martinbuilt]

I doubt that would work. I have never heard of anybody swapping a TCM from 545RFE to a 42RE.

[@joaoboia7837]

@@martinbuilt Thanks for the reply, I read more info and both transmissions are different. I think I will look for information for a transmission swap instead.Regards.

[@jimangelo8319]

Will your transmission fit in a Ram 2500 series truck and does the tcm mack it a545 that is standard in the truck modules

[@martinbuilt]

Yeah the TCM is what makes it a 545 opposed to a 45rfe. There is no physical difference between the 45 and the 545 transmission.

[@haylspa]

use a Jeep Grand Cherokee 2002 56044574AC the 2003-2004 is P56044574AC same just a P in front of it. you could do it with an 2001 as well but would have to flash the ecm, so best to stick with the part numbers I gave this is plug and play for most but you might run into trouble with your 2000 Dodge's but believe it works fine for 2001-2004 and some later models

[@Tchmstr1984]

Does the the 01 end in AB?

[@haylspa]

@@Tchmstr1984 don't use the 01 its not plug and play like the other is, it would work but you will have to pay a programmer

[@Tchmstr1984]

@@haylspa I'm just trying to make sure I get one from 02+, but I'm seeing some ending with a B rather than a C. Seems the B may actually be 03-04?

[@haylspa]

@@Tchmstr1984 go to ebay and put in TCM 56044574AC .people dont seem to put in P even though its the part # Do not buy the AB its newer models and not tested to work...!

[@Tchmstr1984]

@@haylspa right, I noticed that. But I'm also seeing some that don't have a picture of the lable, or some that do and are listed as AC but the pic shows AB.. thanks for specifying/clarifying for me though! What about the PCM? The bulletin on wjjeeps noted that needs updated as well.

[@tobystewart9707]

Okay so just clarifying my questions. I've got a 2000 4.7 v8 dodge dakota 4x4 almost certain it's has the 45rfe. So all I need is a tcm from a 03+ 4.7 with the 545 plug and play and I get another gear? 0_0

[@martinbuilt]

Yes that is correct. I have my 2001 Dodge Dakota I'll be doing the same thing.

[@stevenbedoy5072]

Hey @martinbuilt! I have a 2000 Dakota 4.7L 2WD Club cab. I'm headed to the local pull-n-save tomorrow here in PHX to try and find the TCM from a J.G.C. to perform this modification! I wanted to know what year is the cutoff for interchangeability; is it '04, '05 or '06? Hope when I do this it doesn't throw too many dash lights on my 2000 Dakota! 🙂🤔

[@marcosschroer310]

Do you know if this will also work for the export models?

[@martinbuilt]

I would check part number and see if they are the same for the US and else where.

[@vincenzolozito684]

Hi Martin, I am writing to you from Italy, you did a good job, but I don't understand where the Transmission Control Module TCM / TCU 545RFE can be found, I have done various searches on the web, do you have a code of this piece to look for it? sorry for my english but i used a translator, thanks and greetings from sicily, Vincenzo.

[@martinbuilt]

Hello, you can find them on eBay and I always look for them at the local salvage yards for around $35 you can purchase one here in the US.

[@vincenzolozito684]

@@martinbuilt I searched on ebay U.S.A. Control Module TCM / TCU 545RFE,but I have not found anything

[@martinbuilt]

@@vincenzolozito684 Lookup 2003-2004 Jeep Grand Cherokee TCM, Here is one. www.ebay.com/itm/2003-2004-JEEP-TRANSMISSION-CONTROL-MODULE-UNIT-TCM-TCU-56044574AC/283944743427?epid=1222256045&hash=item421c6cf203:g:Y98AAOSwQyBfCeHW

[@tr3vorb438]

Should disconnect the battery before working on the TCU?

[@martinbuilt]

yeah yeah, I don't even discount the battery when I change out the alternator...lol

[@hafsalinda]

Can the tcm stand alone in a 87 d200 van?

[@martinbuilt]

I really don't know that, but if I had to say I would say no, it needs the ECM as well.

[@ithoughtyouthoughtpodcast2200]

How do you feel about taking one from another jeep from a pick a parts? I have a 99 wj Laredo......and does the 5 speed TCU have a distinct look from the 4 speed?

[@martinbuilt]

Yeah that's where I would get it from and no they look the same. I would just get I from a 02-04 JGC with a 4.7 this will not work for the 4.0 JGC.

[@ithoughtyouthoughtpodcast2200]

@@martinbuilt so i can take 1 from a 4.7 and put in my 4.0 and be fine?

[@DakotaJaegle]

@@ithoughtyouthoughtpodcast2200 no. different transmission

[@ithoughtyouthoughtpodcast2200]

@@DakotaJaegle I miss read what he wrote. Thanks 👍

[@jeanmarc6317]

bonjour .grand merci pour toutes vos vidéos vraiment géniales comme sur la vidéo j'ai changé mon pcm de mon 4.7l grand cherokee de an 2000 par un pcm de 2003 et super je me retrouve bien avec 5 vitesses mais malheureusement j'ai un code défaut qui me signale un problème de de refroidissement moteur , et en effet le ventilateur électrique ne se met plus en route ce qui veut dire a l'arrêt au ralentit il chauffe car il y a que l'hélice du visco coupleur qui marche. alors en attendant de trouver une solution j'ai réinstallé mon pcm d'origine. peut être pouvez vous me donner un conseil merci d'avoir pris le temps de me lire . je suis de france ( lyon )

[@martinbuilt]

Did the electric fan start working after you reinstalled the original TCM? If so that does not make any sense.

[@jeanmarc6317]

@@martinbuilt oui il fonctionne avec pcm d origine. C est pour ça que je ne comprend pas et je ne sais pas où trouver le schéma électrique qui correspondrait. Car il y a beaucoup de fils dans la gaine qui rejoint le pcm le code erreur me dit que sa viens du relais mais alors pourquoi sa marche quand je remet le pcm d origine. Merci de me donner du temps car en France les garagiste ne sont pas à votre niveaux. Merci encore..

[@justenfarnsworth625]

I live in in phrump i am in vegas all week do you have a 5-45rfe tcm i can buy off you i have a 2002 ram 1200 with the 45RFE

[@martinbuilt]

The one that you see in this video, I just recently installed it into my 01 Dakota. I did a video on that as well. Perhaps I should start purchasing ones that I find a pic-a-part and selling them.

[@justenfarnsworth625]

I could go pull one I just figured I'd help you out if you had any extras I didn't know if you pulled them like you pull The HO cams When you see them But I like your channel You have helped me out a lot

[@62ejo]

Thxs Martin good to know..I went to the Equipment Listing and it doesn't say what the trans is??? 2006 Dakota V6.. Can you help..Thxs again....

[@martinbuilt]

enter you VIN using capital letters in the link in the description that will tell you what trans you have.

[@62ejo]

@@martinbuilt Martin I did and got the list and all it said was 4 speed Trans that was all,no numbers on what it was???

[@martinbuilt]

@@62ejo yes on the first page it says that but go to the 3rd page and it will state something like 4.7 Engine(EVA)/4Spd A/T 45RFE(DG4)

[@62ejo]

@@martinbuilt Martin I did but it is on the 5th page this page is label OPTIONAL EQUIPMENT it does list following 4-Spd. Automatic VLP 42REL Trans..This page stated OPTIONAL EQMENT. It thru me these things listed here I thought you had a choice to order when you buy the truck...Thinking that the truck came with a 45RFE as standard...

[@martinbuilt]

@@62ejo yeah looks like it's got a 42REL

[@RANDOMNATION907]

This is only for the V8 engine vehicles.

[@ralphhudson6988]

took the tranny from a 2000 and put in 2002 it wont go into gear. dont know why

[@DarrensTruckzs]

What about overdrive ..I have. 4 speed with overdrive but it’s 2002 but still jus curious ?

[@martinbuilt]

right that is a 45RFE with 4 speed plus OD and the 545RFE is 5 speed plus OD

[@DarrensTruckzs]

@@martinbuilt dang I’m sorry .. I double checked in my truck today.. it has automatic An has 1st 2nd 3rd then overdrive with lockup torque converter.. so which tranny is that an is that still considered a 4 speed or 3 speed with overdrive appreciate your feedback thanks

[@martinbuilt]

@@DarrensTruckzs the gear shift does not tell the number of speeds the trans has. use the link in the description and enter the VIN. Us capital letter as it is case sensitive.

[@TheMemeAlien]

Does this work for the 4.0??

[@martinbuilt]

As far as I know it does not work with the 4.0 engines. They use a different transmission.

[@dogman_]

Is this for V8 only, or inline 6 as well?

[@SkylineFTW97]

Yeah, the I6s used the old 4 speed transmission. They don't physically have the 5th gear like the V8s do.

[@jakeyyyjakeyy457]

Wow

[@marcinjasiak5410]

No need to reset/calibration?

[@martinbuilt]

This should be a plug and play install.

[@justinracine6737]

Would I need to have a shop do a Tcm quick relearn?

[@martinbuilt]

So far my experience is no, this one shifts great with no issues.

[@justinracine6737]

@@martinbuilt that’s what I’m thinking so far as well. I seriously appreciate you sharing your knowledge! Most efficient mod I’ve done to my 4.7 to date.

[@123whosdown]

Does this work for a 42re trans as well?

[@martinbuilt]

I'm not very familiar with d 42re but I really doubt that it would work.

[@jamesg8246]

Our 2003 jeep Vin doesn't work on that website.

[@martinbuilt]

did you enter it exactly the same as shown? The site is case sensitive so use capital letters.

[@jamesg8246]

@@martinbuilt 4 or 5 times, gives me a pdf that says no records found for that Vin. Lol. Oh well.

[@rammzilla3340]

How can you make a 6speed to an 8speed ?

[@martinbuilt]

From my understanding the 545 is actually capable of eight forward speeds and 3 in reverse but you need to find someone that could write the software.

[@dannyw7662]

Does anyone have a corresponding rpm vs speed chart for say at 65 with od on vs od off?? Thanks

[@martinbuilt]

I checked on the way home and at 65mph with OD it was 2100rpm then with OD off 2800rpm. That is on my 01 Dakota with 3.92 gears and 45RFE trans. Will be installing the 545RFE TCM to get that rpm down.

[@dannyw7662]

@@martinbuilt thnx I'll get my GC on a run I think I was 1000 rpm difference. 3:73 gears. Hey the hydraulic fan is that part of the tow pack options? Great vid on fan control. I just bought my 04 GC and thought the fan was electric.

[@dannyw7662]

@@martinbuilt Thnx

[@quantum5802]

Would this work on the 42RLE?

[@martinbuilt]

No unfortunately it won't

[@naserasas8428]

Good morning, where is the easiest to disassemble the gearbox or motor change the Oil Seal jeep grand cherokee v8 wj Thank you very much

[@martinbuilt]

I would remove the transmission to change the rear seal.

[@stephenselzer1907]

Here is the Official Jeep TSB (technical service bulletin) for the dealer to flash your 99 & 2000 Jeep GC 45RFE to thee 545RFE.. www.wjjeeps.com/tsb/tsb_wj_1802501.pdf. It also lists the labor rate and total dealership charges..Should be $95.00

[@Dieselpwr]

Don’t bother tell me what the plate means on the transmission I don’t go off those so many used vehicles have been changed from factory