Sounds like they took your money without really solving your problem.
If the transmission is working like it should, I would check the throttle linkage. It modifies ATF main line pressure according to throttle position. But it would be a surprise if the "national" transmission company didn't do this. 3300-4000 before going into 2nd is too high.
Another thing is to check the activation of the correct solenoids at the proper times. But a good shop should have done this too on their dyno.
It's another reason I would go to an ATRA (Automatic Transmission Rebuilders Assoc) shop, and not a fast lube place or a "national" transmission shop for example.
Originally Posted by dickb
Just had trans rebuilt by national trans company. Have most of the same problems after rebuild as before:
-Start on cool/cold day, no upshift into second until a screaming 4,000 rpm or higher. A manual shift into second gear is possible. When temp gauge needle is mid to top of letter C trans shifts into second gear at 3,300 rpm
-Hard shift from first to second gear
Will the eng temp sensor and or the throttle position sensor be at work here?