'72 C-10 3-Speed to 4-Speed Swap?

[C10 - C90 Bill]

I've got the original 3-Speed Trans in my '72 C-10, which I believe is a Saginaw (looking to verify this), which has a 2.85 1st. The truck has 3.73 Rears and I put extra tall tires on the back to off set the low gear. I'm looking at a 4-Speed Saginaw which has a 3.50 1st. This would give me a much better 1st gear plus an extra gear to boot.

I'm more familair with Muncies, but my question is what do you all think of the 4-Speed Saginaw for an everyday truck? and will it be a direct swap, driveshaft and all?

Any info would be appreciated.

Bill