Go to www.wolfpackradicals.com
and look under Super HPI, then Super Parts. It includes the chassis, top plate, mounts, flywheel, etc.. You will need to purchase an additional mid block and I believe a different belt for the side belt. I would suggest getting a better Y-brace also.
I had alot of trouble with my 8 Port, but its finally running now. I'm sure after it breaks in alittle longer and I tweak the tuning it will be fine. The motor has alot of pull. I'm running 13/20 and 44/37 and it has no problem handling these gears.