Yes, but you could say that about any car, any time, OD or not. A car with a 3.08 rear and no OD had an engine turning less revs than a car with a 4.56 rear and OD. My 92 Subaru 4WD wagon had a five speed with overdrive but the engine spins 2800 RPM at 65 MPH.
My Ford diesel F250 had 4.10 axles with OD. My Chevy diesel K10 has 3.08 axle with no OD. Both have the engines spinning around the same RPM at equal speeds.
Some vehicles work easier and last longer with NO OD and high-number axles.
Getting away from all that, my 1966 Ford F100 with a column shift three speed stick and 240 six-cylinder lasted me 280,000 miles and was stil running when I sold it. So, old stuff could last also. My 87 Chevy diesel Suburban with 3.73 axles and NO overdrive made it to 520,000 before the engine blew to pieces. Many with OD didn't last 1/4 that long.
None of this proves a thing except there isn't any perfect way of expressing, or predicting longevity.
The idea being used now in doing it with "gallons consumed" seems to be the best way of taking into account how hard an engine gets used, instead of just miles or hours.
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Today's Featured Article - A Tractor's Point of View - by John Manley. I began my life on August 3,1941. I was actually built at different times and days but I was officially an M Farmall on August 3.I was real nice and shiny. That�s me, in the old picture, third from the left. I was loaded on that train and sent to a little town in South Carolina. I didn�t get to see much of that town. I was moved off the train fast and on to the dealer�s
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