no pal, the box will be fine, its only if you run differant ratios front and rear.
e.g, my car will run a 4.55:1 in the rear, and a 3.64:1 in the front, so will need to adjust the step offs to suit a ratio differance of 1.25:1 between front and rear,

your setup 3.64:1 rear , 3.64:1 front is 1:1 equal diffs, therfore wont need any adjustment as the 2.0 = 3.9:1 and 3.9:1 so the step offs will be 1:1 std ratio.

does this make sence ?