We installed the Saganaw 3 sp OD in a 56 3100. No change to the driveshaft length. You will need a fine spline front yoke and make modifications to the shift arms and rods. The early version (55-65) will bolt right in - no mods.
Fred

Last edited by rfs56trk; 06/01/2011 4:41 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