Originally Posted by
BuddyBaja
The FM pinions which are the evolva. I think it's a mesh issue and a clearance thing.
Yes, the pitch of the FM pinion gears don't mesh up precisely to the pitch of the Inferno spur gears. You will either have to use the IG pinion gears or mod your transmission to fit the Evolva spur gears (which makes up the Blackhawk transmission that use to be produced).