With those figures and the specs from the tire rack, it points to a ratio of around 4.01 ?
Sure looks like it. I did some searching and the only ratios I find in the ball park of 4.?? is 3.73 and 4.11. Hmm, what to try? For my use the truck doesn't really need taht much gearing.
It's a short bed too, bed is about 6-1/2 feet long is all.
Maybe a th 700 r4, with the overdrive? Would the drive shaft have to shortened/lengthened?