switching from 48 to 32 pitch need help

[JOHN01374]

Guys I've been a brushless guy for a while now and run those motors mostly in traxxas cars and trucks. I have a question about switching from 48 to 32 pitch gears on the rusty/pede/bandits. One of the trucks is a pede with a traxxas V system geared 18/86. Runs great but keeps stripping spurs. Motor just makes too much power (and I'm rough on them) I want to switch to 32 pitch gears but don't know how to figure out the gearing using te new pitch. Also where can I get spurs that'll work with the stock slipper ?

Thanks