I have 3.90 in mine. They are fun in town and in strip but in my opinion too steep to road trip. I ended up installing Tremec TKO600 which works excellent on gears 3.55 and numerically higher. The fun remains same from 1st to 4th as it's geared very close to my original M21 4th being same 1:1. 5th is 0.64 so at cruisin speed 70mph my engine revs only around 2200rpm.