How much play should be in the rear differential gears? - JeepForum.com

 
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post #1 of 7 Old 10-31-2006, 11:57 AM Thread Starter
UltimatE
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How much play should be in the rear differential gears?

I have my rear differential cover off to change the oil and check the gears. I can rotate the drive shaft a good 4-5 degrees before the gears inside the differential start to rotate. Is that bad? If it is I think that's the source the my drive line problems.

*edit: The inside main gear rotates with the driveshaft, however it rotates a bit before stopping (both wheels are on the ground)


-Matt

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post #2 of 7 Old 10-31-2006, 11:58 AM
MrShaft696
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Quote:
Originally Posted by Ultimate157
I have my rear differential cover off to change the oil and check the gears. I can rotate the drive shaft a good 4-5 degrees before the gears inside the differential start to rotate. Is that bad? If it is I think that's the source the my drive line problems.

I would say no, mine is similar, also what are your driveline issues?

96xj 4.0 5sp 4.5"spartan/aussie locked, 4.56 gears 35"KM2's 98 5.9 zj 4" lift 33's..99 xj 235's
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post #3 of 7 Old 10-31-2006, 12:04 PM Thread Starter
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Quote:
Originally Posted by MrShaft696
I would say no, mine is similar, also what are your driveline issues?
When driving ~40mph+, I let off the throttle, and hit accelerator, there is a huge slam.

-Matt

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Black '98 ZJ Laredo - 45x60 Surco Rack - 2" Budget Boost, Addco Front Swaybar

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post #4 of 7 Old 10-31-2006, 01:26 PM
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I had this very same problem - and thought it was exactly the same thing. However, I just installed a RE 3.5" SuperRide kit and the SLAM is gone. I didn't touch the gears... only changed shock, leafs, and removed the sway bar. One of those three things was making this noise - perhaps causing "axle wrap" or other loosness? I was surprised that the noise was gone, but something was definitely loose back there.

I know this isn't much help, but maybe it gives you other things to check (bar pins, loose sway bar, weak springs?, etc.) I see you are to install some leaf packs... check your shocks and when you throw the sway bar in the trash, noise might be gone.

JWeb
'93 XJ, 4.0L / 5-speed, 3.5" RE Super-ride on 31s
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post #5 of 7 Old 10-31-2006, 01:40 PM Thread Starter
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Sway bar is already gone.

I'm pretty sure it has something to do with the TC, DS, rear Diff, or the axles. I dunno, maybe it doesn't

-Matt

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post #6 of 7 Old 11-01-2006, 02:03 AM
shierkahn
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I also had a similar clunk. Found out the hard way that it was the pinion bearing that was bad. Didn't figure it out till it totally went out. Try to move the pinion up,down,side to side. if there's play I'd bet the bearings are shot.

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post #7 of 7 Old 11-01-2006, 05:32 AM
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that play is normal

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