Turbo 400- wants to go and not stop

[Hellbent]

Hey guys, hope someone might be able to help me out with a question. I had my Turbo 400 installed last week and it shifts and drives good. It seems that when it gets hot (after I drive is 10 minutes or so) and stop, it wants to continue to pull. I have to nearly stand on the brake to keep it still. Then when I park and shift to reverse and then drive, it snatches pretty hard. This only happens when its hot. It goes into gear smooth when it's cold (no snatch or lunge)... What do ya'll think is the issue here? It has a brand new torque converter.