i just got my trans rebuilt 700r4 its got maybe 500miles on it and just today i noticed when coast with no gas applied between 25-40 it feels like the tourque converter is locking up. thats just my guess but the car slows up faster than normal coasting then it like realeases to a normal coasting speed also i have a bad u joint and when it surges as i call it u can hear it clank like when i put it in gear.