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  #1  
Old 08-03-2015, 05:06 AM
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ZJ ATX / Reverse Gear Issue...

Greets all,

I recently picked up a 1995 Jeep Grand Cherokee Limited 5.2 V8 4x4 and have been slowly repairing it's issues. This past weekend I finally wrapped up most of the engine issues, popped in a new battery, and got it started up. Runs well enough for a 20-year old engine .

My issue now, that I just discovered, is an ungodly grinding / metallic noise when the automatic transmission is shifted into reverse. For those that have ever "missed a gear" on a manual and got that lovely grinding noise as a reward for your mistake, it sounds pretty much like that. The funny part is that the Jeep seems to work just fine in Drive and can move forward on it's own power... No grinding or issues in anything but reverse. Am I just dealing with a worn / broken reverse gear on the automatic transmission here or is there something else at play here?

Also, I've little experience with these automatic transmissions (as I've preferred manuals on other cars), is it worth tearing them open to replace individual components (like the reverse gear) or is it simply better / smarter to swap out the whole tranny and be done with it?

Any feedback / advice is welcome... Thanks in advance, all!

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  #2  
Old 08-03-2015, 12:08 PM
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Re: ZJ ATX / Reverse Gear Issue...

Does your jeep have the 42RE transmission?
How many miles are on it now? If high milage and never been overhauled, its probably better/cheaper to get a junk yard one with as low as possible milage. Grinding noises probably mean metal all over the place, which already can have damaged bearings.
When it was me, i would look for a junk yard part and when time available, lateron open the other transmission and eventually repair/sell it.
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  #3  
Old 08-03-2015, 07:56 PM
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Re: ZJ ATX / Reverse Gear Issue...

Quote:
Originally Posted by Frango100 View Post
Does your jeep have the 42RE transmission?
How many miles are on it now? If high milage and never been overhauled, its probably better/cheaper to get a junk yard one with as low as possible milage. Grinding noises probably mean metal all over the place, which already can have damaged bearings.
When it was me, i would look for a junk yard part and when time available, lateron open the other transmission and eventually repair/sell it.
Much appreciated! Yea, it's a 42RE... The odo has 120k on it, if that's to be believed . I'm pretty sure the previous owner never overhauled it.

I plan on dropping the ATX pan later this week and I'll see what I find in there. If the magnet in there is covered with metal fragments, I'll most likely be taking your advice and swapping transmissions.

I'll scout out my local junkyards... Thanks again! Great forum here BTW!
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Old 08-05-2015, 01:35 AM
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Re: ZJ ATX / Reverse Gear Issue...

Just wanted to post an update here...

Dropped the ATX pan today and as suspected it looks like a gold miner's pan inside with lots of bits of metal floating around . Fluid looks pretty dark as well, mostly reddish-brown.







Needless to say, I'll be looking at swapping in a junkyard transmission.

I did discover something odd tho, if I leave the transfer case in "4AT" (4WD all the time), I don't get any grinding in Drive, Park, Reverse, etc. As long as you leave the transfer case alone and always set to 4AT, it seems to work just fine. Albeit the Jeep does jerk / move a bit when you shift into different gears (park, drive, reverse).
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Old 08-05-2015, 06:43 AM
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Re: ZJ ATX / Reverse Gear Issue...

All the pieces in the pan are not magnetic? Junk yard transmission most probably be the best in this case, however you could lateron open this one up and see if its still repairable. A spare transmission is always nice, or you could sell it.
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Old 08-05-2015, 05:13 PM
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Re: ZJ ATX / Reverse Gear Issue...

Quote:
Originally Posted by Frango100 View Post
All the pieces in the pan are not magnetic? Junk yard transmission most probably be the best in this case, however you could lateron open this one up and see if its still repairable. A spare transmission is always nice, or you could sell it.
I actually didn't even think to check if the bits in the pan were magnetic or not. I just figured the magnet got so filled up with junk and debris that it couldn't hold any more and the extra floated around the pan .

At the moment, I'm enjoying the discovery of it working normally just leaving it in 4AT. However, I will be hunting around local junkyards for another transmission and most likely swap it out when I get some more free time.

Appreciate all the help again!
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  #7  
Old 08-05-2015, 07:09 PM
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Re: ZJ ATX / Reverse Gear Issue...

This is quite strange. Putting it in 4 all time will not do anything to the transmission, but yes to the T-case. Did you also check the T-case fluid for any debris?
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Old 08-05-2015, 07:12 PM
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Re: ZJ ATX / Reverse Gear Issue...

Quote:
Originally Posted by Frango100 View Post
This is quite strange. Putting it in 4 all time will not do anything to the transmission, but yes to the T-case. Did you also check the T-case fluid for any debris?
I haven't, but I have a suspicion that there is something "not right" in the T-Case as well. I'll have to put checking the T-Case on the to-do list for this Jeep as well.

In all honesty, this is the first 4x4 vehicle I've owned... So, some education / learning is going to have to occur there .

Thanks again for the tips/advice... I'll let ya know what I find.
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