1978: Tilt wheel introduced in F100/350's, Bronco's and Econolines. Was not available with 3 M/T. Tilt wheel operated by pressing the T/S handle forward.
I've never owned a 1948/52 nor have I ever sat in one. There is no way, none that at 6-5, 325, I can fit behind the steering wheel in these tight cabs.
33 1/2" between the inner frame rails behind the cab: 1973/77 F250 4WD (High Boys) / 1973/79 F350 Cab & Chassis / 1973/79 F350's on the 140" wheelbase.
All other 1973/79 F100/350's have 37 1/2" rear frame rails.
Take into consideration that the wheelbase will be longer on 1957 and later F100/350's than it is for 1948/52 F1's, 1953/56 100/350's.