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My numbers were right but I was way off on model....oops. Engage reading comprehension before commenting.

I don't know enough about that engine to make those guesses... but it sounds very optimistic at 20. They have the aerodynamic shape of a brick and may or not have four wheels traveling in the same direction.

You are right. Does going to 37 have any rub problems? Spend money for excellent tires. Edit....had the 37"s stuck in my head....the 33 makes that OD usable, 65 at 2200 sounds great.

Using pi times diameter the 31 will travel 97.4" , 33 will travel 103.7" and 37 will travel 116.2" per axle revolution. Lets use 2000 rpm and the .73 OD, the drivshaft will turn 2739 rpm. If you have the 3.73 the axle rpm will be 734 rpm and with 4.56 will be 600.7 rpm. Thus the 3.73 at 2000...

I was reading about the Dana 80 (I recently slavaged). It's 4.10 and below, anyway there is two different sizes in the 60, 70 and 80, all built the same, I believe. The 3.73 would take the 4.10 and under carrier.... If I understand the question. The 4.56 would be the "above 4.10", so no fit...