So I stripped a spur gear on my Exceed Forza.It's a two-speed transmission, and thus am wanting to ensure I replace it with the exact part. Exceed (which is lacking in documentation) does not have an exploded view down to this level (they just show center diff complete). Additionally, on their site they have a 47t spur gear, and a42t 'throttle' gear.I've not taken apart the middle diff, so amunsure which part to get? Should I be safe and purchase one of each (assuming there is one of each on there)...or just by the entire unit?

p.s. I would have posted this on the Exceed site, but:a) this is a generic two-speed tranmission question, and b) no one everresponds on theExceed forum. ;-)

Here is the link to the parts. http://www.exceedrc.com/sparepart51c812.html
Look for 51C00-06232


Thanks!