Overall I'm happy with my 3.8. The jeep gets around better on 35s then my tj did, after having a 2f in an fj40 the 4.0 always seemed like a gutless slug. Gets far better mileage than the 4.0 too. It is a 6 speed, a lot of the power difference between the 3.8 and 3.6 is noticed with the auto Bc...