Unfortunately, the Nemesis comes with the largest gears that can fit on it stock (21T and 25T pinions with 39T and 43T spurs). The Genesis can be geared up from the stock gears to the Nemesis gearing, but like I have said, these are the largest gears that will fit on the truck. The reason is the engine is already as far over to the left as it can be placed with these large gears.