Well my Rodeo is SAS as well... No dual cases but I do have Tera Low 3.07.1 gears in tcase. As far as the dual cases go Troy has it, also Chad Hunter who lives in Highland was the first one to do it here in Utah. Go to pirate4x4 under Isuzu forum, search under user name Indyguy... Also check out under same name at planetisuzoo.com under drivetrain mods... It is involved and if your Rodeo won't have body lift, get ready to pound the floorboard in or cut and make new tranny and tcase tunnel.. Obviously you will need to fab new crosmember under 2nd case plus redo front one to clear new longer front driveshaft.. Then since you are cutting a big chunk off of the front output on first case you run into hot oil and oiling issues... Troy took some time to dial his in, last I seen him he had a serious leak, but I would supppouse that he has fixed it since.. Do your research and see if its worth it. Also as far as tire size goes I know of at least two guys who have blown tcase output shaft with 36" tires. I have been running 35's and so far so good, keep in mind I have Trutrac in back and open front... As of recent I have lined up a fool spool, so Trutrac might go to front.. Also thinking of going down to 33's as it will preserve my drivetrain a bit better than 35's, as those 35's make most wheeling I do a breeze... My truck weighs like 4800 pounds plus trail ready.. Hope this helps, if you need more info, feel free to ask and definetily check out websites I have listed... Adem