Just to add to the previous post. I had 2 Sterling trucks, 1 was a 26,001 GVW and the other was a 33,000 GVW truck. Both trucks had a 5.9 Cummins with a Eaton-Fuller 6 speed trans. The final drive was 1 to 1 for the trannys. The rear end gear was a 3:90 in each truck. The smaller truck had 10R-22.5 tires and the other had 11R-22.5 tires. These trucks would operate at 65 mph and run at about 2200 rpm. Plenty of power and fuel mileage was always around 10. The trucks would run harder/faster but didn't like it.
These trucks are now gone and have new Sterlings with Mercedes Benz power.
