I've got an 88 S10 with 4l60 2wd I've changed the ujoints and differential axles looked fine diff was ok I'm still getting the clunk going into drive I'm curious if this is from the tailshaft trans shifts fine goes down the road smooth coming to a stop I get a popping noise depending on how consistent braking is and when going into drive I get the clunk

 

Did you grease the slip joint?

 

Actually I didn't know this but I did some research and found that this is actually quite common The GM drivetrain clunk. I did not grease the slip yoke I will be though thank you for your response Old Chevy I appreciate it

 

Ok I greased the slip yoke still got the clunk I noticed when doing this that the slip yoke will go on no matter the position of the slot I'm beginning to believe the output shaft need replacing