I have a turbo 350 3-speed automatic transmission in this Corvette which works perfectly. I'm changing it to a 4-speed automatic .this is the only reason I'm selling it. It is not out of the car yet ,but it is in this car. The transmission has been built to take 500 horsepower easy. It comes with a 12-inch stock converter which is in the car 11 inch 3000 stall converter which is in my shop.call Will if your interested to see how well it works. I only drive this car 2 weeks out of the year. So they have low kilometers on both. Torque converters were built by Langley torque converter specialties