97 suburban trans noise?

I got off the highway yesterday and after stopping at the light took off normally. when I did I noticed a clicking soiund coming from under the the truck. It only does this when accelerating from a stop or slower speeds. Does not do this in 4wd(high or low) trans shifts fine does not make this noise when "power braking" but every now and then will make a loud pop and jumps out of gear. also when you put this in 1st gear manually it makes a clicking sound like it isnt going all the way in 1st. I just had this rebuilt by a guy that moved states but was very well known for his work with these transmissions. This sound like a linkage problem to anyone. Im not not familiar with the linkage adjustment on these. Thanks,Rod