94 s-10 blazer 4x4 "clunk or thump"

i have a 94 s10 blazer that when you put in reverse.foot on brake. When you start to move backwards, and i believe seems more noticable with the wheel turned instead of backing straight back, makes a noise
or thump like something slightly moving. Doesn't seem to be very noticeable if i put it drive and go straight.
1. Both torsian bar mounts were replaced last about 4 months ago(looked again and no movement) 2. u joints don't seem to have any play in them 3. replaced tranny mount since it had a small tear on the one side
balljoints? Visually nothing seems odd. The sway bar bushings on the a arms seem to have some space in them(the rubber is several mm's away from the bar at the inside point. could this make a noise as it shifts position
Any leads would be appreciated
Mike 94 s10 blazer 85 cabriolet

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