You need a Factory Truck Manual. The procedure for adjustment is in there. As long as you didn't feel any tightness when you took the mast part way off, you should be OK. Too far and you will damage the ends of the ball channels (this will make more sense once you read the Manual).
Carl

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission