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Unread 03-17-2013, 05:02 PM   #1
MapeDogg
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1994 YJ Wrangler 
 
Join Date: Aug 2012
Location: Corryton, Tennessee
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Rear diff grinding 94 yj

There is a grinding sound coming from my rear diff when there is no load on the driveline. As long as I am accelerating or decelerating in gear there is no noise. When I reach a cruising speed or coast in neutral there is a fairly loud grinding sound that is worse the higher the speed.

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Unread 03-17-2013, 07:27 PM   #2
seattle_yj
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1993 YJ Wrangler 
 
Join Date: Jun 2012
Location: Issaquah, WA
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Quote:
Originally Posted by MapeDogg
There is a grinding sound coming from my rear diff when there is no load on the driveline. As long as I am accelerating or decelerating in gear there is no noise. When I reach a cruising speed or coast in neutral there is a fairly loud grinding sound that is worse the higher the speed.
Pull cover. Inspect. Magnet through oil. Check carrier, pinion, yoke for movement.
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Unread 03-17-2013, 08:43 PM   #3
frhrwa
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1984 CJ7 
 
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also, if you have posi-trac, make sure you have the correct rear end fluid, and vice versa.. posi lube in a regular non posi rear, or even in a locker, will grind and crunch like crazy..
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Unread 03-17-2013, 09:21 PM   #4
dlutz94
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1995 YJ Wrangler 
 
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Take the diff cover off and drain it and put new fluids. My buddy had the same problem and he let it go and ended up blowing it.
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Unread 03-18-2013, 04:02 PM   #5
MapeDogg
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1994 YJ Wrangler 
 
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Location: Corryton, Tennessee
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Thanks for the help ya'll! I'll try these suggestions and see what happens.
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Unread 03-18-2013, 04:12 PM   #6
SuperStew11
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2000 WJ 
 
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Had similar problem in my wife's 94 ZJ after I changed the fluid, posi-differential needs an anti slip additive you only get from Dealers
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Unread 03-19-2013, 09:32 AM   #7
Evildriver-3
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1995 ZJ 
 
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Location: , Suffolk, NY
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Check your pinion nut, a quick look chock the wheels, and then put it in neutral to relieve any load on the shaft, grab it at the end yoke and see if you have ANY movement up and down or in and out, it should only have some turning movement but NOTHING in any other direction.

If it has any movement other than what it should , either the nut has loosened, or the bearings are in need of replacement.

.
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