[TheViking]

I agree with KingBoost, the 3.73 with locking rear differential is more than enough (it's also what I have). Coupled with the 6 speed tranny, your first 3 gears are torque multiplying gears, in first gear it's the equivalent of having about a 5:10 gear ratio. I've had mine in north padre beach sand, salt water marsh, and thick mud and never been worried about coming out on the other side.