SC10 gear Diff, you need to add spacers , did to mine and made a plastic spacer, now its super smooth.
coppeid this on another thread on here, a few threads below....
the link for another Manufacturer is
ARRMA
AR10003
http://www3.towerhobbies.com/cgi-bin...&P=SM&I=LXBKXG
AR10009
http://www3.towerhobbies.com/cgi-bin...&P=SM&I=LXBKXH
AR10008
http://www3.towerhobbies.com/cgi-bin...?&I=LXBKZH&P=M
Tower has it , check it out.
