I recently did a 4 speed to 3 speed OD conversion on a 59 3200. The column was drilled and threaded and had all the holes in the correct location. We obtained the shift linkage and bolted it right on.
I could understand that a column on a larger truck may not be set up for a column shifter but it would seem that the entire steering box would be larger as well. The tube is not removable from the steering box so as Bill recommends - you really need the correct 3 speed column.
Fred


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