C30 Stake beds

[1966C30Stakebed]

Thanks for that info on the rotation of the wheels. Now I know I will not be going with the 19.5 as little to no mileage will be improved. Now I need to rethink about buying the 4.10 gears. I thought being I had to buy tires anyhow, I would upgrade to the larger wheels to improve the mileage and lower engine rpms. But the 16's inch tires will be much less expensive and easier to find bargain prices on and I already have the wheels. But I would like to find a positraction that will fit the GM HO52 as I just heard from the person selling me the 52 that the ring and pinion of 4.1 will have a hard time fitting in the 72 do to a bearing and the 52 has a crush ring. I don't know if that is true and could use some advice on that.