Re: 12-bolt - 1972 'KDC' code
I would agree at $500.00 your in the park. Remember: this rear is for a specific application, for 1972: KD 2.73:1 ~ 12-bolt (L48/350-4). So it may have a higher value for a targeted restore or period application. Provided the guts are still good, you did fine. 12-bolt housings alone are bringing as much as complete 12-bolt Posi's used to.
Such is the case.
1970-LS5, #28- Fathom Blue,TH400, original motor car.
1970- NOM, 496, M21, #48 Forest Green.
1972- Malibu, 350. TH350- original motor car, #43 Gulf Green.