A while back I bought a 9" rear from a friend who was parting out his early 70s f100. It has a 5 on 5.5" (roughly) lug pattern. My car is running a 5 on 4.5" (ruoghly) lug pattern. I am going to be changing the length of the axle to fit under my car, I will have to buy aftermarket axles to fit the narrower housing. Is there anything benificial to the larger pattern?? If so, how tough would it be to convert to the larger pattern on the front??