[HoosierDaddy]

Bill, my understanding is that you want to prevent the driveshaft from being driven by the wheels as the vehicle rolls. The driveshaft will spin the output shaft in the transmission which could cause internal damage. Removing the driveshaft is the surest solution. Removing one axle is OK if the differential spider gears are not seized and there is lube in the axle. In your case since the differential was compromised I would have removed the driveshaft or both axles. The Allison trans is very stout and may be fine but I would talk to an Allison service center about it for sure.