My '35 1.5T has a 216 swapped in, a much better engine. My best speed is 45 mph, and a good cruise is 40. At that speed (with no load in the bed), the mechanical brakes are adequate, but that's all. I have a lower rear (6.166), so that's all it will do unless I make a lot of change$. I suspect your truck would be the same. Some will say that bigger tires will help, but beware... the larger tires will increase braking effort.
With the stock juice brakes, I would not plan on more than 55 cruise, unloaded. To get there, you will want a later shell bearing 235 engine, larger wheels/tires, and possibly a higher rear. Good luck!
Last edited by thurman; 06/13/2019 6:04 PM.
