mod 1 pitch i think he meant one tooth. I do believe it is a 32 pitch for the gear.
The cooling fan attached to the motor mounted heatsink. Good pickup if you plan on getting upgraded batterys as the longer the motor runs the hotter it gets.

The cooling fan barely will cut run time at all. But will reduce temps quite a bit.

Honestly i run a 16 tooth pinion and the stock gear on the diff, i get out of the hole and still have nice top end for the long straights.

Matt you plan on racing or just playing around and bashing.