You cannot turn the shafts, The side cover is the only main difference between the car and truck trans in those years. They are clocked completely different. You can however use the side cover from the truck on the car transmission. There are two types of side covers, the scissor type and the ball type. Either one will work but the shift forks do not interchange with each other. Take a close look at the wear on the 2-3 shift fork. If it shows a considerable amount of wear it should be replaced.
Fred

Last edited by rfs56trk; 09/20/2017 4:49 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