Originally Posted by Adam Howe

Have a look at this page on the website if you scroll down to the spur gears it gives you the correct ones to run with your motor. It's the v2 car but the section on spur gears outlines what I am saying.

I'm not sure what you mean when you say centre stiffener can you post a photo.

http://www.team-durango.com/race-cars/detc410v2/