think about it this way, at 85 in 5th gear with 4.10's im about 31 or 3200 rpms, pretty high in a 5.0, but 4.30 add 200 rpm, 3.90 minus 200 rpm, with a redline of 6800, 3 grand isnt nothing, plus you will still get 20+ mpg, my last vegas trip i got about 25mpg averaging 85mph, for 220 miles with...