thanks for the reply's!!! i think my slipper might be too tight cause i run the slipper pretty tight thinking that it will put more power to the ground in the higher rpm. my gears are meshed pretty good, not to close where there pressed together, but spaced out enough where they spins freely. my rear diff spins fine, i replaced the old diff gear when i got the truck due to the fact it was shot to start with. i drive the truck stricly street...no jumps, off road...none or that, just whipping it around the parking lots, and drag racing it agains my friends aftershock and rc10gt. (im the fastest...lol) i got a hardend steel clutchbell last weekend so if my slipper is correct i should be good to go with another steel spur gear......could chassis flex have any thing to do with it cause it only seems to chip the spur when i spin out or accerate really fast when the road get bumpy.....let me know what you'll think and thanks for the help so far.