Rear end problems??

[Steelrat]

ok, have removed driveshaft, replaced u joints, tightened every conceivable mount, bolt, bracket, etc. Motor mounts are good, tranny mount and cross member good. Slide a links tight, frame connectors tight, , shocks tight, all u bolts tight. leaf springs good and tight.
Still has the clunk, so I thik it is in the rear. Here are 2 vids.

http://www.youtube.com/watch?v=Dr1nL...layer_embedded



http://www.youtube.com/watch?v=98BoE...layer_embedded


Edit, video's were sent to a rear end guy, he says looks like the pinion nut that holds the pinion in is loose.
That is why is good under load, but clunks when coasting or no load.