Transfer and Rear-end durability?

[TGPilot]

So my wallet will have it's work cut out for it other than just engine upgrades. These are the things I want to know about before I put alot of HP to the ground and destroy something that could have been taken care of before I planted my right foot to the floor!

I actually want to race this car off-road in the Pikes Peak Hill Climb Association (one seater Rally of sorts) the end of this year and go full force the start of next season. I will race it in the 2006 Pikes Peak Hill Climb and hopefully shatter the Rally-America folks times in another class. I know that mountain very well!

Any Rally prep issues I should be concerned with other than the obvious suspension, tire, and undercarrage protection?