JK Gear Change - Tranny Problems - JeepForum.com
 
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post #1 of 10 Old 10-19-2013, 11:33 AM Thread Starter
imoveteeth
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JK Gear Change - Tranny Problems

Having some significant trouble wondering if anyone can help out...

Jeep is 2013 JK Unlimited with 3.6L.

Recently lifted, added PR44 with 4.88 front, changed rear end, and tried to update with a programmer to correct.

First we tried to use the Aeroforcetech gauge since it sounded like it had the ability to work. Didn't work.

Then we used a Diablosport Trinity because they supposedly had updated codes to make it work. No Joy.

Unmarried the Trinity and tried an AEV Procal. Jeep immedately starts to run rough when in Drive or Reverse without even moving. Goes in to limp mode, very little throttle response, and feels like its slipping. Have been working with AEV and they have given us multiple steps to try. We've done every one with no success.

Finally took it to Dealer to try and reflash everything back to stock so we are starting with a clean slate and they are unable to do this because they say everything us current in the system and their programmer wont allow them to unless there is an update.

They've cleared a number of codes but P0735 (Incorrect gear ratio in fifth) keeps coming up. We are starting to wonder if there is a physical problem in the transmission. The Jeep has 740 miles so hard to believe this, but never know if some damage could have happen.

Any experts have any ideas? My Jeep is all done but now its just a pretty pumpkin. I'm not sure what to do or where to go from here. Dealer says only way to reflash PCM and TCM is to buy new units so their program will do it. AEV thinks it could be a speed sensor or solenoid pack....

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post #2 of 10 Old 10-19-2013, 02:59 PM
RockyClymer
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Check speed/ABS sensors on front since you replugged them into the PR44 (I assume it came with tone ring). I am sure someone on here has programmer experience on a 13, but not me. If the Jeep will not move when in gear, then something related to the tranny is askew...selector sensor? That sounds like a lot more than bad shift points IMO. If the dealer says you are current, then I would believe them. I am not sure which programmers work with a 13...

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post #3 of 10 Old 10-19-2013, 04:36 PM
brianjw
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Quote:
Originally Posted by RockyClymer
Check speed/ABS sensors on front since you replugged them into the PR44 (I assume it came with tone ring). I am sure someone on here has programmer experience on a 13, but not me. If the Jeep will not move when in gear, then something related to the tranny is askew...selector sensor? That sounds like a lot more than bad shift points IMO. If the dealer says you are current, then I would believe them. I am not sure which programmers work with a 13...
Certain procals work on a 2013 but I don't think all versions do.
Also the speed sensors are in the knuckles (I'm assuming he's talking about a front axle). But that is what I would investigate first as well.
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post #4 of 10 Old 10-27-2013, 10:19 AM Thread Starter
imoveteeth
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Speed sensors are in the knuckles and not getting any ABS codes. We replaced the TCM and had it reprogrammed which subsequently reflashed the ECM. Used the Procal again and still the same error. Does anyone think there could be a mechanical problem in the tranny / valve body?
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post #5 of 10 Old 10-27-2013, 11:56 AM
aznjeep
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Quote:
Originally Posted by brianjw View Post
Certain procals work on a 2013 but I don't think all versions do.
Also the speed sensors are in the knuckles (I'm assuming he's talking about a front axle). But that is what I would investigate first as well.
Agreed with this statement. Quadratec assured me the one I ordered was the updated version. Granted, the engine isn't running "bad", but the tire codes are off by 5psi (meaning, if the AEV chart says to do this for 28 psi, the Jeep registers 33 psi... I had to improvise and figure out that the AEV setting for 23psi is really 28psi on my 2013. I keep meaning to call AEV, but just keep forgetting...

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post #6 of 10 Old 10-27-2013, 12:16 PM
73azbronco
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might want to double check the actual tire size and the tire size programmed. My AEV procal had to have a number that was not the actual tire size put in to account for the 2013 procal issue not being quite right.
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post #7 of 10 Old 10-27-2013, 01:13 PM
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Sorry this isn't an answer but background. Unlike earlier JK's the 13' runs a separate ECM and TCM as well as the ABS module which monitors WSS's. The NAGS1 TCM is a pita for aftermarket tuning and not well supported. Even with our swaps we have to work with it since it is so invasive. One qualifier for P0735 is:

If the actual gear position is higher than the position (5th) supposed by TCM, the slip ratio will be more than normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.

The ABS module reports wheel speeds to the network, the ECM calculates rpm vs vehicle speed and don't forget the transfer case ratio which affects calculations. The TCM has multiple speed sensors including ISS and OSS. All these signals must jive, especially in automatic vehicles.

Fortunately we ditch this overly complex system with our swap and run a 6l80 which is more sophisticated yet simple.


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post #8 of 10 Old 10-27-2013, 01:20 PM
RockyClymer
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Note, I figured the OP ordered a complete PR44 with new knuckles and hence needed to plug the sensors back in...

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post #9 of 10 Old 10-27-2013, 06:24 PM
SubAtomicGenius
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I'm presuming that changing the rear end means that you regeared to 4.88's on the rear.

I'll just throw this out there, but one of the first steps in regearing is inspecting the number of teeth on the ring gear and on the pinion to confirm the ratio. It is not unheard of to receive the wrong ring and pinion in a box. I'm a technician and I always go back to where the problem began - which in this case (I am only presuming) is the install of the front axle assembly and the regear of the rear. The Wrangler drove into the garage to have this work done, didn't it??? (lol) I presume that the transmission wasn't touched and you've said that the programmers didn't work! So nothing else has changed? Just a thought!
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post #10 of 10 Old 10-29-2013, 04:24 PM
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Good advice. When in doubt, retrace your steps.
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