with my 150 shot i had the gsr tranny first ,with it i would hit the juice and i wouldnt be able to shift fast enough , and the 1/4 i was shifting in to 5th,now with the ls in my car i get trantion at the top of 2ndi shift out of 2nd at 75 3rd tops 105 and in the 1/4 mile i never have shifted out of fours gear.so i am happy with it but if u do gsr na its good turbo or boost of some kind ,u will shift more offten,with ls u will be in boost longer getting more mph its all up to u ........