67/68/69 cuda dilemma

About 1/16" wider than a stock width A body rear. Its a lot of work but the plusses outweigh the minuses by a long shot.

Up to at least 1999 everything on the exterior side is SAE thread
1/2" RH thread lug studs
Mopar big bolt pattern
Disc brakes
91-92 dakota u joint fits ford yoke, and mopar driveshaft
Locking differential most cases
Decent gears most cases
31 spline axles
Rebuild kits are inexpensive, all common bearings
Brake parts are dirt cheap thru rock auto
Found a company who makes e brake cables that fit mopar chassis in the front, ford e brake in the back

The down side is
Shortening one
Cutting off all the unusable brackets

Look for a data tag on the axle that says 3L55 or 3L73 and you got 3.55s or 3.73s with a locking diff. L denotes locker on the tag. If theres a space between the numbers and no L stamped there, its an open diff. The sport trak explorer truck thing almost always has a 4L10 tag on it. I think 4.10s and a locker were standard on that thing.