you dont want the tr6060 from the challenger or camaro because they are set up for an independant rear suspension. there is no slip yoke only a flange, also no speedo gear, it went in the rear axle, and the shifter is mounted along with the shift rods , on top of the trans, its a major pain to make work.
you end up needing a custom driveshaft that has a slip built into it , and an adapter to fit the flange on the back of the trans. then you still need to set up a sensor for the speedo. and the shifter also bolts to the floor.
the T56 magnum is the same trans but with a tail shaft and shifter like a regular T56