Shes definitely no power house, but that's part of my attraction to the truck. I dont suppose Ill ever tow too heavy with it, maybe 15000lbs max once just to say I did. The weak rear ends is the story that I was told about this truck as well. I was told that when it was in the states hauling lumber in the 50's, one of the rear ends failed. They found this Mack single axle at a scrap yard and shortened the frame and welded it in. Unfortunately, the Mack rear end has a 6.14:1 ratio, when the factory rear ends should have been 6.7:1. It also has too large of rear tires right now (9:00-20, when stock is 8:25-20). With this set up it will do 100km/h, but it doesnt have much for towing power at all. I dont intended on chopping the truck up, just trying to put it back as close to factory as possible, especially because of how rare it is. If i cant find the correct rear ends for it, then it will likely stay with the Mack axle. The truck does have the Clark 204VO and the Spicer auxiliary transmission, Having that many gears sure helps get the truck up to speed. In my service manual, they refer to the differentials as Eaton 22MF and Eaton 22MR, or just Eaton 22M when talking about them as a pair. So these differentials were likely only used on the 450 series trucks then? That makes my search much harder.
