The truck comes with a 4 cell battery holder, you just replace that with a 5 cell hump pack. The center diff is up to you, it comes in the kit... the pro's and con's are..... massive power, wheelie trade off of letting it out are less wear and tear on the drive train, no wheelies (good thing in my opinion), can adjust front or rear brake bias. 10k-50k-3k seems to be a good diff oil setup if you go that route.

The axles seemed like more of a problem with the nemesis than the genny, but it doesn't really matter because cen upgraded the part and kept the same part number so all new manufactured one are stronger and if you happen to get the older style cen will replace them if it is under warranty.