I posted this in LT tech and they sent me to you guys for better results.
I tried to install a new torque converter 2 weeks ago. I had to stop and put it all back together without swapping converters. I got to the last 3 bolts holding the tranny to the engine and I couldn't break the bolts loose. I reinstalled everything as it was without loosing any fluid and everything seemed fine until yesterday.
Yesterday I started to notice that the shifts seemed to "slip" into gear rather than "jump" into gear. The revs would slide up while the gears slipped up from 2nd to 3rd. It usually just "bangs" right into gear, espessially after the Trans-Go.
When I first had the Trans-Go intalled there was a similar problem, but not the same. Then, the car would slip into gear as now, but only at high RPM. The cure was to jam in the gas pedal 10 times with the car off. This worked and I don't know why. It did not work for me yesterday.
Sorry this is so long, I am trying to explain the best I can.