97 blazer v6 ..i bought it from a guy that said the transmission was rebuilt and the car had been maintained by a mechanic but the second day i got it the engine blew so i took it to a shop and they put a 95 engine it ...so i dont know if it really did have a rebuilt transmission bc the guy obviously knew the engine was going to blow soon ...but anyways when i move it from park to drive it clunks and what can i use to correct this ..the transmission fluid is fine from what i saw..

 

It could be alot of things try checking the drive shaft and u joints and the rear end for anything loose.

 

U-Joints like project 96 said.

 

k thx