I took out my tranny (AOD) to replace the rear main seal. Made sure that the fluid levels were good after shifting through all the gears. The tranny was slipping at first which I assume is normal until the fluid gets moved around. The slipping eventually disappeared. When I took it around the block the car would not shift into 2nd. I was driving it slowly (about 20-25) usually the car would shift around that speed. Also I installed a high stall converter (2000-2400). I was wondering how long is the break in time and if it is ok to push it a little harder since I changed the torque converter. Also there was some smoke but I did get a lot of oil and grease on the exhaust when I was taking it out. Thanks again