I'm working on putting a 4 speed saginaw in my truck, combined with a 302 jimmy and a 3.07 rearend. There is no problem using the speedometer cable, it plugs right in. You just need the right gear insert for the saginaw tail housing. I'm going open driveline for the rearend I have, its out of a '66 Chevy half ton. I got the saggie for $50, and its brand new. I lucked out and got it at an estate sale, it had been sitting on the shelf of an old man's garage and has factory chalk marks and no wear on the gears. Use the 2-groove version for the wide range gear ratios. It has a 2.54 first.
