If you wanna go rock crawling I some good trails, your gunna want the d60 cause even built you your snap a built front axle with that motor and some bind in the front end. Really, the fact you a 454, 14bokt rear and on and on, if you wanted to stay light, your kinda started on the wrong foot lol. You would damn near not notice the 60 under the front though.
If it's more mud, slick rock stuff you can probably get away with the 44 a lot longer than out here.
What's the trans/t-case and power steering setup under it? Locked front and rear? That thing would be fun as hell in the sand dunes