"In back, traditional leaf springs were used to increase cargo capacity, with a maximum metric ton long-bed version through 1990. The 2,205-pound or 2,240-pound (depending on sources) payload capacity was comparable to some full-sized pickups; to get there, Jeep added heavy-duty U-joints and propshaft, Dana 44 rear axle, and heavy duty brakes, among other items.
According to Bob Sheaves, Dana 44 axles used in the metric ton package were actually a hybrid axle-a semi floating design, they used a D44 ring, pinion, and differential case with smaller wheel bearings and D35C design wheel ends on the axle shafts, when compared to the earlier D44 used in the CJ. He noted that the Class 7 racing cars started out as metric-ton MJs. " This is off the allpar site. As I said I am not sure if it is or not , haven't gotten under to look yet. I was just going by what this said.