transmission chatter

I jsut recently had my tranny rebuilt and now there is a chatter when it shifts from 1-2 and also when I am driving and when i step on the gas and the rpms go from like 1500 and drop to 1000, so when it shifts. but i dont notice it when i accelerate hard

Take it back to the shop that rebuilt it.

And post the &^%$&^$# make, model, and year of the *(^%#&^$*(&^ car!!!

If its Ford RWD the answer is easy and clear cut, if its a Nissan its a whole different story.

sorry, its a 97 yukon 4whl drive

Thanks :) If you had said Ford, Mazda, or Toyota, there are go-to solutions for chatter, but I agree with SilentChamber... take it back and get them to make it right.