8.8 swap questions

As the tubes are a thinner metal on the 8.8 less rust would be better. Remember to use the friction modifier with the lsd dont trust the modifier in Royal Purple it is different. Would look at the backlash settings before closing it all up. Even though you are using the same ring and pinion the tolerences will be different and you also may get bearing noise as after about 10k miles they wear in a certain pattern. Dont pull the pinion as you need a crush sleeve to go with it. That being said dont be intimidated by it as it is pretty straitforward.