Im in the market for a good 5 speed tranny, right now I have a Z code t5 that i bought new a few years ago, and im so wishin i had bought a tk0. My engine is done i wont be making any more power than 530 at the tires same goes for torque. I came accross a good deal on a used tk0 500 with a 10 spline input shaft, which is nice because i wouldnt half to replace my new Powergrip clutch. Would a tk0 500 be ok for me, or would a 600 be a much wiser choice?? Also is the input shaft a weak point? I dont race much maybe 4 or 5 times a year,and i never power shift. Id really like to get the 500 with 10 spline but dont wanna waste my money on a transmission for the 2nd time!!