i will just have to balance it out with a sterling or dana 60 in the rear. the frame should be able to handle allot, they dont seem to flinch with 401 swaps. i know not the same but a starting point. you would be surprised with how much weight people put on there jeeps with a v-8 swap, heavy bumpers, winches and other equipment like jacks chainsaws etc.
i am not really into the mudding anyway, more into the trail rides and some rocks if anything. it will be mostly be a road vehicle anyway, i dont beat the hell out of my stuff like i used to. i can get a dirt bike for that.