42RE No reverse,is in drive when in reverse and neutral

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#1
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MAKE:JEEP
MODEL GRAND CHEROKEE
YEAR
:1999
MILES: 220
ENGINE
:4.0 6 cylinder
DESCRIBE ISSUE.... Will not go into reverse. When in drive it shifts fine. Put it in neutral or reverse and it is in a drive gear. It is a 4 wheel drive. Any help?
 

nickb2

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#2
This sounds like a bad reverse band went south or a clutch disc package issue or a gunked up body valve.

Here is a snapshot of hydraulics. Pay close attention to the black highlight's in the following snapshot.

Screenshot (550).png
 

nickb2

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#5
If after you have checked out all that, and I hope not for you, this maybe will be a overhaul issue at that point.

But plz try to eliminate the easy stuff first before jumping to conclusions.

Sometimes, the TCM will throw a code.

Start there. It's is free to get that.

As a joke. Remember to park your jeep nose forward.
 

nickb2

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#6
Is there an autostick function? It could also be a TRS module. I am just throwing ideas out. From memory, you can see live data on pressure readings with a DRB.

This is an interesting thread.
 
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nickb2

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#8
To get to the line pressure fittings, you need a certain skill level. When you remove the actual reverse fitting, be sure to have a accurate gauge.

The rear servo test point is located here. Check snapshot below.

Screenshot (552).png
 

nickb2

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#11
From my database, they say that anything above or under 3 psi on the rear servo is suspect. That is how you know you have a accurate gauge.;)

I am not a trans specialist, but I do know mopars.:cool:

You can check for accuracy by differentiating reading from front to reverse line pressure readings.:idea:
 

nickb2

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#12
Ok, I think I wrote enough to get you started on a proper diagnosis, time for me to go to bed.

I am an sticker like this, but I would like for you to respond your findings. That is my paycheck.

Other ppl may drop in on this thread and find a solution.

So plz post back your result.
:bat:
 

bp042665

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#13
ok a few things to hit on it can be a drum that has sezed together or the stator is cross leaking on planets
drop pan and see whats inside for dabrie
 
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#14
ok a few things to hit on it can be a drum that has sezed together or the stator is cross leaking on planets
drop pan and see whats inside for dabrie
ok a few things to hit on it can be a drum that has sezed together or the stator is cross leaking on planets
drop pan and see whats inside for dabrie
I have already dropped the pan and everything looked good. Oil still reddish. Magnet had the usual muck around it, not much/ I went ahead and changed the fluid and filter but it didn't help. Got a valve body from the junk yard and installed. Still the same problem. No codes coming up. Was messing around with the 4 wheel drive shifting it in and out and got the reverse gear one time. Could not get it again. Amy thoughts.
 

billr

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#15
Get a pressure-gauge and a long hose, so you can observe those various pressures as somebody else drives.