gmcman
Registered Member
I have an 81-86 combination 1/2 ton gmc(LOL).It has 12 bolt axles.Are the 10 bolt parts interchangable?The ratio is 2.73 and I have 31 inch tires with a 4-speed manual and 350 engine so not great power but I am thinking of a 6" lift and 35" tires and want to change my ratio. This is my DD and most driving is on the road so I would like better power and acceleration with the bigger tires but still be able to travel highway speed without over revving. I have done some research in the past but kind of forgotten some of it. Any info or suggestions would be greatly appreciated!