Speed Inc. Stage 3 4L60E guys
Don't waste your money on the speed inc trans. "designed specifically for cars with blowers or large shots of nitrous" and it died 2 weeks after I installed my blower. It had a plastic 1-2 accumulator piston too. They have good cust. service; they offered to cover it under warranty even though it was 7 months old, but by that time my roommate already had it rebuilt and ready to go back in the car. That one lasted 2 months under boost. I am currently saving for an FLP level 4. Speed inc. doesn't build them themselves they are built by extreme automatics.

