Just my 2 cents,
I believe my m1078 is far from being geared correctly. Last night I tested gps speed and checked engine rpm.
2645 rpm at 61 mph, level grade. Cat recommends for the best balance of performance and fuel mileage
2000 @ 60 with a max cruuse speed of 65. Also a recommended minimum cruise speed of 55 @ 1800.
Makes me wonder if the military designed the vehicle with a top speed as a primary consideration.
The torque and horsepower drops very fast as the rpms are pushed above 2400. My 1078 is 274hp
with 3:90 gears….
I owned a Hawkins class A with a 3116 and it had plenty of power, it blocked more wind and was much heavier
than a 1078. At cruise 65mph it was only turning 1650 rpm. I pulled a 27’ enclosed trailer most of the time.
The fuel mileage was great, 9 to just over 10 mpg. I drove with the flow of traffic mostly 70 mph.
One of the local construction companies has a tri axle dump with a 3126 and regularly weigh in at
70000 lbs when moving there excavator from job to job. He did say it a turd with that kind of load
but it will pull it to road speed.
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