I agree with Tim. Get everything in place then take a measurement. You could very well be able to use the standard driveshaft from a 55-2 through 59 1/2 ton (short bed) providing the wheel base is the same.
Fred

Last edited by rfs56trk; 05/14/2012 4:20 PM.
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine