M139 Road Speed
Yes, our truck still has the original 1400x20 NDCC tires, Denman on the front and Silvertown BFG on the back which are dated 1961! Rear hubs were flipped and the spacers installed on the outside with the rear tire/wheels reinstalled as singles. Load rating on the tires is less than a tank of water alone so we don't dare carry anything while traveling between sites. Top speed as best we can judge is 45-50 on the interstate with level going. Have to check timing as I think it may be slightly retarded. Carb is a brand new Zenith and based on fuel use, lean conditions are not the problem. Truck seems slower than it should be, but it runs great and there are no problems or funny noises other than the gearing noise at speed which all of these trucks tend to have. I am sure that if we removed the interconnecting drive shaft between the tandems, that the truck would handle better, but in the conditions we use it, this would not be the best move.