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Unread 12-02-2012, 09:47 AM   #1
HopFarmer
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Join Date: Dec 2012
Location: Sandpoint, ID
Posts: 1
42re transmission no reverse after rebuild

Problem: 42RE will not go in reverse, shift to third or fourth, and engine will not act as a brake during deceleration.
Events leading up to present:
I purchased a 2000 Grand Cherokee with an overheated engine due to radiator crack and the guy said transmission was starting to act up also. I rebuilt the engine which works fine, but my 42re overhaul on the other hand isn’t going so well. I have the factory service manual and have gone through it numerous times. No codes using my snap on brick. After my road test and pressure gauge test I pulled the transmission and went through the entire valve body again, transmission and overdive section and could not locate anything wrong.

Air tests activate the bands and from what I can tell both front and rear clutches make the proper “thud”.

Before I removed the transmission using my pressure gauges I did the reverse test and had erratic movement on the rear servo port (210-260psi) when throttle lever is open and 145-175 psi with throttle lever closed. Has anyone seen this erratic movement during a reverse pressure test, couldn’t find info if this is normal...doesn’t seem right

Could the issue be how I compressed the overdrive direct clutch pack (using home made setup)? I am using another 42re driveshaft during compressing and releasing so the alignment stays. Depending on how I hold pressure on the shaft while releasing affects how easily the spare shaft slides in and out? Could the direct clutch possibly be binding causing any issues?
I don’t want to install this and have the same issues and have to remove that transmission again to fix the problem so hopefully someone has seen this problem before. Thank you!

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