Another Rear End Clunk Noise

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I read as much as possible, but haven't found something on my specific clunk problem. After cruising for a few miles then coasting into parking lots with minimal to no acceleration I get a clunk noise/feel, which appears to be coming from the rear. Recently, the clunk came in multiple rapid successions, i.e. clunk, clunk, clunk. The clunks were rapid, then go away. I recently replaced my rear drive shaft with new U-joints, but they did not resolve the problem. I've checked differential fluids and regreased all Zirk fittings. I plan on replacing rear bearings simply because they haven't been done in years.

Anybody have similar problem and some possible solutions? The feeling can be pretty unnerving.

Thanks for any help.

Rob

 

[bronconut73]

Prolly need a shim to adjust your pinion angle. You need 1.5 to 0 degrees. If you have real soft springs you may need 2 degrees.

As the shaft turns it is having to push in and out of its slip shaft to accomodate the bad angle.

The shaft slipping in and out is making the clunking noise.
Pretty common. It is often called the eb clunk.

 

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That sounds about right. I was reading up on this angle issue and, after my 2.5 inch lift, the angle looked to be more than desired. I'll find the post on pinion angle, get some current measurements and determine how much shimming I will try. I believe Wild Horses has a primer on this, as well, in their product catalogue.

Thanks for pointing me in the right direction brother.

Rob

EDITED - I found the reference on pinion angles. It's in Tech Articles entitled, Measure Pinion Angle
And Install Rear Axle Shims, Tech article by 70_Steve

I'll check this out and make the modifications recommended.