Well, first off, the 1970 Charger on ‘Dukes of Hazzard’ wad the General Lee. You,know, like General Robert E. Lee. And secondly, if the problem in the differential is in the limited slip or spider gears, the your in luck. The rear axle is similar to the Ford 9" rear axles like they still use in NASCAR. The center unit ‘pumpkin’ that houses the pinion, ring gear, and spider gear arrangement is removable, and easy to work on on a bench. All you need to do is slide the axles out on both sides just enough to disengage the gears in the pumpkin, and unbolt the pumpkin from the axle housing. Then, take the pumpkin to the work bench, and fix the gear unit there. Or swap it out with a unit from a junkyard that has been inspected.