hey i stripped my spur gear and replaced it on my 2.5 rusty it took a lil tuning to get the clutch right afterwords and now at top speed when i let off it sounds like its whinning a lil i've torn it apart again to make sure i got it assembled right and it is ... its meshed right not chewing anything up ran like 3 tanks thru it and its fine if i loosen it - it just slips too much if i tighten it - it goes outta control when i let off the gas now i wanna make sure im not going to hurt anything cuz so far no damage from what i can see and i gotta whoop my buddies revo this weekend .... thanx