Thump Thump in rear end?? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 09-09-2002, 07:12 PM
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Post Thump Thump in rear end??

I have a 69 corvette. This car has the independent rear suspension and posi traction rear end, with disc brakes on all 4 wheels, 350 engine with automatic transmission, 60 series 235 radial tires on 8 inch rims, on front and rear.

Just recently when I go around a corner (normal slow speed) I hear a thump, thump, thump sound, coming from the passenger rear tire. (I think) To make things more confusing, it doesn't do it every time I turn a corner. Only sometimes. I took the rear wheels off and found a worn out shock mount (rubber bushing) and a loose bolt that attaches the lower shock mount on the side the noise was coming from. Convinced I had found the problem, I installed 2 new rear shocks, and tightened the lower shock mount according to specifications, on the passenger side rear. I examined everything else and it looked good.

My efforts have made no difference. I still get that thump, thump, ocasionally when turning a corner. No other problems with the car. Anyone have any ideas???

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Old 09-09-2002, 09:22 PM
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Arrow

I would look for several things;
  • Is the center section mounted in rubber bushings? Check the condition.
  • CV Joints
  • Check the break away torque of the clucth pack (see shop manual)

In fact, a proper shop manual will not only give you the proper illustrations of assembly, but also a diagnostic routine.
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Old 09-09-2002, 10:57 PM
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Universal joints take a beating in these cars, have a close look at the inner and outer on both sides.
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Old 06-12-2005, 11:12 AM
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rear thump

Your thumping noise could be the posi-unit needing a change of lube. When they needed changing they made this noise going around corners. Change the fluid with a good brand of lube 85 to 95 pound rear lube for a posi and add GM posi fluid. This is a small bottle of fluid additive for the posi unit to stop the hopping noise you here. It is about 10.00 for it. g Give it a try, it might be whats wrong. Steve
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Old 01-23-2007, 01:58 PM
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If it's the posi-unit needing a change of lube it will chatter going around corners, at least that's what mine did untill I changed the fluid.
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Old 01-24-2007, 12:05 PM
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It could even be a bad belt in a tire. Often hard to detect when it first starts. Had this exact thing happen to me. Occasional thump when turning. Try 5-10 lb less tire pressure and see if it gets worse.
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Old 01-24-2007, 12:16 PM
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Whatever it was, its fixed or broke by now...This thread is almost 5 years old....dug up twice................"the corpse is rotten, Dr Frankenstein"

BTW...4 Jaw had this one pegged...seen it a number of times
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Old 01-24-2007, 06:09 PM
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Wow! I didn't even look at the date - I guess from now on, that's the first thing I'll look for.
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