Quote:
Originally Posted by truckdog62563
Agree, that’s not gonna light up the road. The 38 mph limit is no doubt a feature of probably having the 6.67/1 final drive ratio. Mentioned above is the 4.11/1 custom ring and pinion set that Chuck Mantiglia has available. Unfortunately that set is for the Timken 51524 axle used in tonner and 3/4 ton models. Last I recall Chuck telling me, though, he has NOS 5.14/1 sets on hand. Whether they will work in this early axle he’d have to say. Link below.
Another option discussed for the Bonus Built and later trucks is the substitution of a Dana 70HD axle from a 1970s era motor home, either Ford or Dodge. Same 5 x 8” pattern. These generally have a 4.56/1 final drive ratios. I know of a couple later trucks that were so modified, but again on this early truck the spring perch spacing and spring widths would have to be studied. Stu
http://www.chuckstrucksllc.com/startframe.htm |
When I had my '40 1 1/2 ton I bought a rear end assembly from a Dodge motor home complete with springs, perches, and 19.5 wheels and tires. It was a 4.56. The frame width was the same so the swap would have been pretty straight forward. Sold the truck before making the swap. But correct me if I'm wrong but isn't the '38 1 1/2 ton a closed drive line set up? That would make the rear end swap a tad bit more difficult. And the total width of the motor home rear end assembly with the duels was wider that the '40. A couple of inches if IIRC.