Do you know the rim width of your wheels? The first mention of a 7.50 X 20 tire, in the parts catalog, calls for a 6 inch wide rim with 5-3/8 " offset and is applicable to 1946 and later models. There is a 20 X 6 wheel shown for 1936 but says for single rear wheels only. It has only 3-1/4" offset and is for a 700 X 20 tire. You can make a spacer to go between your rear duals to gain some room but the larger tire will rub your drag link on the left front when you turn left. This could also be the case if you use later wheels to get the required rim width and offset for the rear. The same offset that solves the problem at the rear, creates a problem at the front.
Let's start by deciding what wheels you have now. Here is a picture of my 1936 truck before I blasted and powder coated my rear wheels. Note the very triangular hand holes in the wheels. I believe '36 was the last year for this design. Later wheels had holes that were more "D" shaped. At the time of this picture, my truck was wearing 6.50 X 20 tires on the front and 7.00 X 20s on the rear. I hope this helps. Mike
