One of these days I'm going to have to figure something out with my Backdraft. The motor I bought has a slightly larger diameter can and interferes with the drive shaft/spur gear carrier. I can't adjust it far enough to get a good mesh and I've been going through a pinion about once every other battery.
I bought the thing used with no ESC. I put a 150a Hobby King ESC on it and the original motor fried.