Well lately I've beat the hell outta my tranny racing it at the track (usually 20 1/4 runs each visit) and the GM stuff has still works really good for the environment I'm putting it through... I'll usually race 6-7 times per session before I give it a cool down time, then its back at it again... The events I race at usually have 4 sessions per event so... So far, I'll never use anything else in my tranny other than the GM Synchromesh.