[Airdirect]

I have recently upgraded my 1979 C70 Chevrolet from a 5:29 ratio Eaton 2 Speed rear end to a 4:56 ratio. I did the work myself. This was my first time to setup a rear end. It was a simple and straight forward process, the only element that made it difficult was the weight of the assembly and parts. This truck was factory equipped with a Eaton 17201 rear assembly with a 16 spline pinion and yoke. The later series was 17220 which had a 32 spline pinion. I have listed below the available ring and pinion sets for this series.