e-maxx spur gear

[danielc79]

hi i've got a summit motor 775 in my e-maxx and i wanted to gear it down i have a 21t pinion on it now and had to grind my transmission to get that to fit. i bought an 18t pinion but cannot find any spur larger than 68t. how can i gear down from 21t i can't grind that much of my tranny away.

any help would be appreciated. or if anyone knows where i can find a spur larger than 68t that would be great too. want to stay with plastic but metals ok if thats all thats available.