4th gear is the same in the M12 and MN6 (1:1). Every other gear ratio is different though. I’ve run all the numbers befor and 3.90s matched with a M12 is almost exactly the same in 2nd gear as the M12 and stock 3.42s. I ran the numbers because I was considering the 3.90s and M12 for the closer gear spacing of the M12 but didn’t want to lose 2nd gear RPM for AutoX.
Anyway Mike, my buddy has all his mods off and they are ready to ship sell. Kooks 1 3/4" LTs, ETP 215s, MS3, Vararam, and a bunch more.