i am currently working on taking a 1978 chevy 4x4 suburban and turning it into a 6 wheel drive i plan on putting in a GM perfomance parts 502 off road motor and want to put in an atlas 4 transfer case the plan is to couple them to a TH400 tranny i would like to know if anyone knows a company that sells TH400's built for 450+ horse power and 550+ lbs/ft torque and what else would i need if i do need it to mate the atlas transfer case to that tranny  

So youre gonna mate 1 atlas to the 400, then run the rear shaft to the second atlas. which is gonna run the front axle#2-or reverse geared axle. that will take the power from the front output of t-case 2,and the rear will feed the rear most axle, that way the front otput from t-case 1 will feed the front axle. right?
1, both t cases will always have to be in same gear,any where the grounds kinda hard?
2. the trannys going to push all that metal around and will need all the torque capy it can handle.
It will be cool when your done and will probably never get stuck!!!
luck to ya and i hope the drive shaft angle on the rear most output wont be too tight, ime not knocking ya, i think it will be awwwsuuummm!happy wheelin
look at jegs or summit.com for the tranny ideas,ime pretty sure some reader/racers have a fave!  

Is your project began or still under study?  

wow i really want to see this gone trough with but i can't really help much but on th400 there are plenty of places to get one that will handle a crate 502 dude there are 700r4s that can handle like 700 hp! im sure a th400 can handle a crate 502 even with 500 hp  

in the late 80's or early 90's peterson's featured a red chevy pu with a 454/700r4 and two 205 t-cases, the rear most was a divorced ford unt that ran both the 14bolt ff rears, it also had air bag suspension with the boxed in frame used as an air tank for the bags.

the thing looked pretty cool, they used it to pull a trailer.

that'd be great to see again. I'm sure I still have th issue, I'd take a month to find it though...  

an allison from a duramax should bolt up too... if the 502 has the same bell housing pattern as any other big block...