I have a 95 C1500, 4.3 V6, with the GU6 3.42 rear end ratio w/ drum brakes. I have an opportunity to get a 3.08 GU4 (I want the 3.08 since I don't tow and prefer the better mileage that should result) w/ disc brakes. Question: While I know the axle will bolt up, what changes will need to be...