apparently the challenger's use the MB rear subframe assembly for their IRS.
it looks VERY similar to a 124, but the diff has a wider mount bracket... likely to handle the hemi's torque.

my point is, the diff is a positrac 215mm aluminum housing... so... any challengers in the junkyard could yeild a strong 124 style posi aluminum housing bolt up!

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

I think its prolly from the v8 engine SUV. I am convinced that was the case with my 05 AWD Magnum. Lovely in snow but rode like a logwagon and never topped 20 mpg highway ever.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.