VIN check forum says you need 25 posts, and I'm not there yet. I'm sure I could post a bunch of BS to get there, but that's just rude. I'll do some searching, just not sure what words to use. I imagine typing in "rear end" will get me a million results.
Few ideas..The company I used to work for used ONLY Suburbans and YukonXL's they bought around 40 of these a year....few things i remember forsho.....
1.For some reason the rear brakes do not feel like they are evenly proportioned to the front,and when slowing the binding there is noticeable..seems this is a GM thing?
2.U-joints/hanger bearing,also called carrier bearing..
3. The rear diffs always seem to get some slack quickly,[dunno why],so I know the clunk,but i don't have it on my rig,BUT my work truck does it!!
4.This may be a stretch,but are the specs[for the rear end]all within acceptable limits?[i know,that has to be checked]Be sure there is gear oil in the differential..
5. Maybe the driveshaft turning under engine power then slowing down brings the noise,like when the Allison has pressure on it,then you press brake or let off throttle and it slows itself[hard to x-plain dis
]and that may be the clunk if anything is outta spec range in the rear end...[what i mean is that the diff may not be shimmed correctly at the ring/pinion...
6. Check and see which locker you have in there.. someone may have added the wrong lube?
It almost sounds as though the locker is not disengaging,does the rear feel ''binded''when you go round a corner??If it's the locker,that'll clunk like u described..It might[i dont know forsho]be engaging when you slow down?The locker kinda works on momentum/centrifigal force to engege...thankfully there is a easy way to test the locker,spin the tires on wet grass or something like that,when one wheel spins faster than the other by a few hundred rpm it kicks the locker in,then as you take off the force is releived from the discs and it disengages..
If I can think of anything else I will post it up for you....Shoot me a pm...sorry for long ol post,just trying to help out....
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