i would think if it is turning 2200 at at 60 at the times .....i dont think it is the converter,,,i think it isnt going into 4th gear........are you sure it is in 4th gear when it is doing this?
The trans does make all the shifts perfectly. No problem there. The trouble is with the TC not locking up.
you need a scanner that can read the computer here.......a good scanner will show if the computer is sending a signal to the tcc solenoid.......if the computer is sending the signal then the tcc solenoid is bad...[this is very possible,sometimes these may break down with heat when they go bad],,,if you arent getting a signal,the problem could be the brake switch or the computer itself..........you will need to have the scanner plugged up while you are driving it to test this