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Old 10-04-2005, 05:45 PM
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Rearend Noise

Guys I have a 1984 gmc Jimmy (fullsize) 4X4. When I turn corners at 30 km I hear a "grinding" noise. I thought it was brakes but they seem fine. I was told it was U-joints but I just replaced the shaft and all joints approx 1000km ago. It has been only occurring since then, there is no play in the joints. The rear driveshaft had a bad yoke so I had it replaced and the shaft was tuned so it shouldn't be the problem but it may be. Any other ideas.

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Old 10-04-2005, 10:06 PM
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grinding

Just a couple more questions to help us understand. Does it grind when you turn sharply to the right or left? Does it make a difference which way you turn? When you hear the grinding, apply the brakes, does the noise change? I doubt that you have a U-joint problem because the load on them does not change when you are turning corners.

Let us know,
Rick
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Old 10-05-2005, 06:31 PM
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I only hear it when I turn, either way at normal corner speeds (20-30 mph). It is kinda like I hear the noise every tire revolution. It doesn't really change when the brakes are being applied. I had a tough time entering a word for the noise so I called it a grind, it definitely sounds like metal on metal.
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Old 10-05-2005, 06:33 PM
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My mechanic uncle said it could be the u-joints because the tires turn at different speeds when you corner??
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Old 10-05-2005, 09:28 PM
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rear end noise

Noises are pretty hard to diagnose without actually hearing them, however, if you hear the noise only on corners it is probably in the spider gears inside the differential. These allow the wheels to turn at different speeds when you go around a corner. The U-joints and drive shaft turn at the same speed whether you are going straight or cornering. I would also look at the axle bearings because when you turn you change the load on them from the shifting of the weight on the vehicle. Also if it is a limited slip diff, you could have a problem with the clutch plates.

No matter what, you will have to disassemble and inspect all the parts.

Good luck and let us all know what you find!

Rick
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Old 10-06-2005, 07:57 AM
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I changed the oil in the differential about a month ago (I don't drive it much) and everything looked perfect in there. It is a limited slip. This all being said I don't know exactly what to look for. I would agree with you on the U-Joints, because I don't feel/hear something at highway speeds.
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Old 10-06-2005, 08:11 AM
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Did you use lsd oil? or a GM additve, it could be clutch chatter in the posi.
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Old 10-06-2005, 12:11 PM
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rear end noise

If you changed the fluid and only used 80W-90 gear lube and no limited slip additive, you will have chatter when going around corners. The limited slip additive allows the clutch plates to slip a little bit so you can corner without noise. Just put in the additive and give it a try.

Rick
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Old 10-06-2005, 06:50 PM
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The reason I changed the oil/inspected was because the noise was already there. I used the oil with the additive.
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