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Rear differential noise

5 messages,  Last post on Oct 28, 2008 at 1:56 AM

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#1 of 5 Rear differential noise by grboregon Sep 12, 2007 (5:17 pm)
I have a 92 Trooper, automatic, and the rear differential whines----a lot. I pulled the rear brakes, pulled a rear axle and the axle bearings feel tight and smooth when you rotate the axle. I disconnected the driveshaft, started the car and the tranny and transfer case are quiet. A stethoscope on the rear axle housing sounds like a lot of gears whirring. In reverse it makes less noise. When I first start it up it takes it about 10 seconds of being in gear before the noise starts. Fluid is good and new. I was told thrust washers maybe or ring/pinion gear or ???? Also where is a source for parts and a manual. Replies to this message: atfdmike (Nov 09, 2007 6:27 am)
#2 of 5 Noise by razorsedge911 Nov 08, 2007 (6:51 pm)
i have a 92 and a 5 speed, my rear end whines alittle bit, but did u put the friction modifier in your rear end with synthetic gear lube???
#3 of 5 Re: Rear differential noise [grboregon] by atfdmike Nov 09, 2007 (6:27 am)
Replying to: grboregon (Sep 12, 2007 5:17 pm) I have a 94 and from about 60 to 75 mph the rear end sings with a noticeable whine. I have read that is a characteristic of these models. You don't say what speeds you are experiencing the whine, maybe that would narrow things down.
#4 of 5 isuzu roar by jpw454 Oct 27, 2008 (2:20 pm)
i have a 96 isuzu trooper ls 4x4 rear end roar we have replaced carrier barrings and pinion barrings we also replaced universal joints this helped the roar but it is still there between 55 and 65 mph replacing these barrens has helped some but it is still there what should i do next? Replies to this message: atfdmike (Oct 28, 2008 1:56 am)
#5 of 5 Re: isuzu roar [jpw454] by atfdmike Oct 28, 2008 (1:56 am)
Replying to: jpw454 (Oct 27, 2008 2:20 pm) It is pretty subjective as to how loud your "roar" is, that said, generally, if replacing the pinion bearing does not correct the problem, then it is the typical gearset noise you are hearing. Generally most noticeable above 60 MPH. My guess would be a new ring and pinion, aftermarket, not OEM. No guarantee though, one guys opinion. HTH

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