soobruce Posted September 21, 2004 Share Posted September 21, 2004 I have a thumping noise coming from the rear differential of the car as I drive slowly (coasting or stopping). Sounds like it clanks or thumps with each wheel rotation. Here's the key...when I put the car in Four-Wheel drive, the noise dissapears. I lifted the car - an 88 GL wagon - and had a friend rock the right rear wheel back and forth and the noise seems to come from the front part of the differential. Thanks for any help. Quote Link to comment Share on other sites More sharing options...
thealleyboy Posted September 22, 2004 Share Posted September 22, 2004 Bruce: I dont know why actuating 4wd would make any difference, but I had the same symptoms in my 93 Loy. The solution was replacing the rear wheel bearings. I wouldn't jump to that conclusion until you ruled out some other things, but you should consider that possibility. good luck, John Quote Link to comment Share on other sites More sharing options...
GLCraig Posted September 22, 2004 Share Posted September 22, 2004 check the U-joints in the driveline going to the diff. Quote Link to comment Share on other sites More sharing options...
Subi81 Posted September 22, 2004 Share Posted September 22, 2004 My 81 does a similar thing sounds like a mariachi band when I drive, I traced it to the U joints. Good luck Quote Link to comment Share on other sites More sharing options...
bushbasher Posted September 22, 2004 Share Posted September 22, 2004 Maybe its a CV joint and when you put it in 4wd the rear drivetrain is no longer dragging but but just going the right speed so there is no load, therefore no noise? A bad-ujoint will generally clunk more rapidly than the tire rpm becaus of the diff ratio. Quote Link to comment Share on other sites More sharing options...
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