Diff ratio help

i know that there's a few flavors of these boxes in regards to 1st gears and which OD gear, so i'd say pick one that will be most usable in OD and compliments the gear spread the best.

with the power you have the starter gear is a really a non-issue, and i'd guess you'd have trouble not totally just blowing the tires off in first or second.

running some quick starter and final drive numbers, i'd probably pick something in the 3.7~3.9 range

souns like a cool projects, let's see some pics!