There were OD options for Model Ts. Chevy had a Truckstell OD that was fitted into the closed drive line in the '40s or early '50s. Borg Warner made the R-10 & R-11 ODs for everyone Packard, Ford, GM, Studebaker, etc. There were always options.
My McGurk book doesn't mention transmissions at all but he does say that 3.55 gears were the best choice for the highway. Tire sizes were 6.00x16 or 6.70x15. Powerful engines could run 700x16s. That produced 115mph ay 4,600 rpms and needed 180hp.
We all know what money i$, one of the reasons I've been driving the same beat up old pickup for over 35 years. Another reason is because I love it. 3.55s, T-5, 28" tires. It'll run 70 to 80 all day under 3000 and get 17 to 18 mpg while ignoring mountains. 4,000 + miles in one week just to attend the Lone Star Roundup in Austin. You can take the boy out of Texas but you can't take Texas out of the boy!
