For some reason when i back out of the throttle and let my car slow down, if i tap the gas or stomp it or anything my car makes a clunk and a little bit of a jerk. it's not my tranny i don't think i just had it rebuilt about 4 months ago

Any suggestions

 

Any suggestions?

 

maybe the mount, do you have the stock rubber?

 

check your drive shaft U-jonts. it might also be your carrier. i hadt to replace my carrier after a shop "said" they checked the fluid.
get it to a decent shop that does drive train.
my "thunk" was from carrier clutches being burned up. bad thing is , its a borg carrier they burned up. ahh well, all fixed now.
as grafx said check your trannt mount as well. start small then work from there.

 

i have a new mount but what are carriers?

 

carrier is another term for posi. if its a clutch type and the clutches are burned up it could poss cause your "thunk"