This is a built trans in a TTA. I can run down the parts if neccesary. When the car is first started and driven everything is fine. Shifts are great. But if you take it on the highway or just drive it for a while, its start acting up. The shift points are off, it will downsift to early and bog, it will sometimes buck. You know like a manual will do if you dont let off on the clutch incorrectly. Does this seem like a converter lock up problem or something else? Im not sure what to do to diagnose or remedy this. Its very annoying. Any ideas? TIA