I just got the TKO 500, I would have gone with the TKO 600 but I just bought a clutch and didn't have an extra $300 to shell out. What is the big difference. From what I have read, the TKO is the same except different gear ratio's and only comes with the 26 spline input shaft. If I were to get another clutch and then buy the 26 spline input shaft would the TKO 500 be just as strong as the TKO 600 but with lower gear ratio's? This has been bothering me.