rear end whine? -
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Unread 12-14-2004, 12:32 PM   #1
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rear end whine?

I have a 93 Grand Cherokee with the AW4 automatic and np 242 transfer case,ever since i bought this vehicle with 197,000 miles on it,there has been a whining/scraping noise coming from the rear end it's really noticable once you get up to 20 mph and all the way up,once it hits about 67 mph the car starts vibrating,i changed the tires to brand new ones just barely and it didn't make hardly any difference at all,does anyone know what could be wrong with this,it now has 207,000 miles

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Unread 12-14-2004, 12:44 PM   #2
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Check the, rear brakes (93 has drum rear) and differential to try and isolate where the noise is from. Do you know which diff you have? It usually dana 35c but dana 44a was on ZJs with factory towing package.
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Unread 12-14-2004, 12:44 PM   #3
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Well, if it was brakes, they would have worn down a long time ago. Bad wheel bearings wouldn't last 10000 miles either. So, it must be in the differential. Most likely caused by the ring and pinion gears not meshing properly. They are probably close enough to not shatter, but off enough to cause a whining sound. When is the last time you checked the fluid level in the differential?
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Unread 12-14-2004, 08:32 PM   #4
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it was full about a month ago
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Unread 12-14-2004, 09:38 PM   #5
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Maybe it's late but, the thread title got me to look.

Gears baby, definitely the gears.

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Unread 12-15-2004, 01:01 PM   #6
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My guess is I'll be having this problem somtime too. I checked the oil in the rear and when it came out of the hole it looked like metal flake paint. Why did they use aluminum against steel in the rear? IDIOTS!!

What fluid would you guys suggest I use to try and counter act this?
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Unread 12-15-2004, 01:13 PM   #7
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Any gear oil will do (75w-90 or 80w-90). Just do not use synthetics because you need the rear diff rebuilt.
Cheers Steve

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