go 4.10, ive only driven my car about 50 miles with 4.10s but in 5th gear it only added about 300 rpms. with 3.27 i was at 1000 at 40 with 4.10s its like 1300 at 40. at 70 its still under 2500. which really doesnt seem that high, my old car and both my moms and sisters car is at 3000 at 80.