Rear disc brake conversion

[MoparLeo]

There is also a bolt on stop for the cable end available. For anybody needing it , here is a Mopar diff measurement chart:
http://www.waywardgarage.com/tech/rearaxlemopar.html

 

[Kern Dog]

I'm sort of in Monclaire's corner on this one. If it were my car (which it isn't), I would at least consider finding an 8-3/4" rear end and do the rear disc conversion to it. They were a stock option. I had a 73 Charger 318 auto car that came factory with an 8-3/4". Do you NEED it with a 318/6cyl? No. Would it be a good idea for any future upgrades in performance? Yes.

The 8 1/4" axle used a similar bolt pattern for the backing plates, they just omitted the hole at the 6:00 position. They can accommodate the same brackets to mount disc brake kits as any 8 3/4" axle.