Rebuilt 4L30E with brand new components. The way in which the NorthStar V8 makes its power is different from a standard LS. Obviously driving habits will have to change but in general it should hold up. I am not forcing anyone to buy the kit when it is done, nor am I promising your transmission will go 150,000 miles with this motor. What I am promising is a V8 kit that the average weekend mechanic could do themselves and have it be cheaper than any other alternatives.