Originally Posted by ta_man

It should be obvious that you MOD .8 and MOD1 won't work together (any more than mixing 32 pitch and 48 pitch would be expected to work) but MOD.8 and 32 pitch are essentially the same size and will work together.

The SCTE uses MOD1. The RC-Monster gear is MOD.8/32-pitch. The RC-Monster gear was created to fill a need for a usable Ten-T spur gear (before the SCTE spur existed) because the 810 and Ten-T Nitro cars come with approximately MOD.9 spurs and no-one made electric motor pinions that size.