Zj rear end locked up! - JeepForum.com
 
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post #1 of 8 Old 08-06-2018, 04:14 PM Thread Starter
D-Dozer
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Zj rear end locked up!

Having problems diagnosing the issue with my ZJ

Okay, my name is Dillon. I have a 1997 Jeep Grand Cherokee (ZJ). The guy me and my father bought it from said the rear end is locked up. He said the motor was rebuilt and only had about 40 to 50 thousands miles on it. It has a V8 5.2L, and the motor seems to run fine. We picked it up from a mechanics shop and they also agreed it was the rear end that was locked up. Well we've done a lot of research but yet to come to a conclusion. We lifted it off the ground spun the rear tires and the rear spiders gears would spin, but nothing else. We then started it up and put it in drive. Nothing happened. We put it in reverse and again, nothing happened. We decided to throw it in 4 low and put it in drive. The spider gears, ring and pinion, and carrier in the rear differential would turn. The drive shaft was also spinning. It also made an awful grinding noise. The drive shaft will only spin when it is in 4 low. When we put it back into neutral after being in 4 low, it developed a nocking noise sounding like it was coming from the transfer case. This nocking noise maybe repeats every half second. Throughout this whole process we never got the front tires to spin, and the back tires only spun when we put it in 4 low.

If anyone could point me and my father in the correct direction that would be greatly appreciated.
Thank you.

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post #2 of 8 Old 08-06-2018, 04:32 PM
riverzj
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Quote:
Originally Posted by D-Dozer View Post
Having problems diagnosing the issue with my ZJ



Okay, my name is Dillon. I have a 1997 Jeep Grand Cherokee (ZJ). The guy me and my father bought it from said the rear end is locked up. He said the motor was rebuilt and only had about 40 to 50 thousands miles on it. It has a V8 5.2L, and the motor seems to run fine. We picked it up from a mechanics shop and they also agreed it was the rear end that was locked up. Well we've done a lot of research but yet to come to a conclusion. We lifted it off the ground spun the rear tires and the rear spiders gears would spin, but nothing else. We then started it up and put it in drive. Nothing happened. We put it in reverse and again, nothing happened. We decided to throw it in 4 low and put it in drive. The spider gears, ring and pinion, and carrier in the rear differential would turn. The drive shaft was also spinning. It also made an awful grinding noise. The drive shaft will only spin when it is in 4 low. When we put it back into neutral after being in 4 low, it developed a nocking noise sounding like it was coming from the transfer case. This nocking noise maybe repeats every half second. Throughout this whole process we never got the front tires to spin, and the back tires only spun when we put it in 4 low.



If anyone could point me and my father in the correct direction that would be greatly appreciated.

Thank you.


I'd say case easy. Crack case, or drain fluid. Everything you've said points to your case. Could pull drive shaft first. You've inspected diff right?


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post #3 of 8 Old 08-06-2018, 04:35 PM
kg6mov
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Yeah, that sounds like the tcase ate a fork or the chain.


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post #4 of 8 Old 08-06-2018, 04:46 PM Thread Starter
D-Dozer
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Yes, we've taken the cover off the Diff and inspected it. Everything looks fine in there.
We were kind of thinking it was either the Transfer case or it was the Transmission.
Thank man. Guess we'll pull the drive shaft and transfer case when we get time.
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post #5 of 8 Old 08-07-2018, 01:28 AM
Timo_90xj
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Check the transfer case, sounds to me TC is the most likely cause for the issue.

Pull the front & rear driveshafts first, and make sure both the front and rear axle spin normally. Also make sure both axles have the same gear ratio, it's not impossible someone replaced either axle and got one with an incorrect gear ratio. That would cause TC or axle issues very quickly on V8 that has a 249 AWD transfer case.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #6 of 8 Old 08-07-2018, 06:21 PM Thread Starter
D-Dozer
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Quote:
Originally Posted by Timo_90xj View Post
Check the transfer case, sounds to me TC is the most likely cause for the issue.

Pull the front & rear driveshafts first, and make sure both the front and rear axle spin normally. Also make sure both axles have the same gear ratio, it's not impossible someone replaced either axle and got one with an incorrect gear ratio. That would cause TC or axle issues very quickly on V8 that has a 249 AWD transfer case.

We are going tp buy a transfer case from a local scarp. He wants $250 for it and is giving us a 90 day warranty. We are going to go from there. I have a Dana 30 in the front and a Dana 35 in the back. Nothing on this jeep has seemed to be upgraded, everything seems stock.
Thank you guys for the replies
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post #7 of 8 Old 08-08-2018, 05:57 AM
Timo_90xj
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All '96-'98 V8 ZJs came with the aluminum center- section D44HD from the factory; only '93-'95 V8s, and all 4.0 ZJs came with the D35 rear axle. So, if you actually have a D35 back there, it certainly is not the original rear axle on your '97 5.2.


I would definitely verify the axle gear ratios - 4.0 ZJs came with 3.55 (some tow-pack would have 3.73s), and 5.2/5.9 always came with 3.73 gears.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #8 of 8 Old 08-08-2018, 07:08 AM
Boone96ZJ
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if looking at the differential from the rear of vehicle, if the cover is round it is a Dana 35. If it sorta looks like a " D " then it is a Dana44HD with the aluminum center section.

96 5.2 242 3" 32x11.5
https://www.jeepforum.com/forum/f13/1996-grand-cherokee-laredo-5-2-a-2570290/
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