F15 diff swap

[Harry Moon]

I sure found a difference using the 10.50X16's I got from Wallace wade. Seems to make a big difference on my chev.
I've also put 20 inch rims on my truck for one trip and with 1100X20 i think i hold the land speed record in class. I've thought of the 900X20's I have on my project C60L might come in handy.
There really is no way to change the diffs on an F15A or C15A, maybe an F15 or C15's. Thought of using a CCKW overdrive but that couldn't work out without moving the differential back on the Frame.