If you're running sand and mud...definately auto....here in the mountains I run my rig (Jeep) with a '92 Tuned Port Injected 5.0, older SM 465, Ford Dana 60 high pinion front and Dana 60 rear with 5.13s and detroit lockers on both ends.
Atlas TC, 3.8:1 gives me a crawl ratio of about 135:1 in Low/Low
The biggest advantage with the 465 is the hold-back on these STEEP, downhill mountain trails. For the road, I wouldn't give 2¢ for it.
We don't do much crawling over rock, more over downed trees(dead trees - put this in so any DEC officers reading this don't stop at my house). A lot of steep hills with washpan or some shale. My big concern is mud pack auto with heat then wheeling in the sand.


