The shifter arms on the side cover point in opposite directions on an AD truck. The arms point the same direction in a later truck. If you want the shifter to work right you should swap the covers.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.