3 or 4 speed? I have a 1950 3100 torque tube, with 235 & original 4:11 rear gears, 3- Speed and she goes 60-62 (per GPS) before starting to make lots of noise. These engines were meant to rev up! I do hit the freeway but only for short distances.
Todd
Edit sorry just read SM420. 4 speed
Last edited by Shaffer's1950; 11/27/2020 7:51 PM.
