which manual transmission is stronger a SM 465(4 speed) or a NV 4500 ? which has the most transfer case options? i am looking for the ultimate (and want full controle going down hill) whats the best option? and where too buy a complete combo? what will the rpm be? (now got a th 350 np 203 parttime combo,4.88 diffs 38.5 super swampers, 2700 rpm at 60 mls an hour) who nows?