Rear clunking

[Benjamin Oliver]

I have a 99 chevy Silverado 1500 2wd extended cab/ third door with a short bed.  I noticed a clunking noise and replaced all 3 u-joints and the carrier bearing but the clunk seems to be worst and now makes the noise in reverse. I'm at my wits end with chasing the noise. When I lift the back end up the noise does not present itself.

I have also added gear oil to the rear differential with no luck.  Please help its my only working vehicle.

Edited January 24 by Benjamin Oliver

[richard wysong]

Is the rear end leaking? Could be lots of things, any different noise from the  diff? How are the spring hangers and bushings? Brakes? Transmission mount?Trans crossmember? Pinion bearing, Diff carrier bearings? Impossible to diagnose online. They had lots of problems with those rear ends back in the day

[Benjamin Oliver]

New brakes and rotor all the way around and the leaf and coil springs are good. New carrier bearings. 

[richard wysong]

Carrier bearings in the differential?