how much power is gained from 273 to 342s? why i asked is ive finished my lt1 swap basically and im not impressed with the power yet. i cant make it spin in drive when taking off i dont know if the 273s are holding itback or whats the deal. but in reverse it spins pretty good. <i know its not good to hold the brake down and gas at the same time> but i did try it. in drive it wont spin on blacktop=\ but in reverse the rearend sets up and the car drifts sideways. so why wont it do it in drive. or even spin in drive?