Isn't 5th gear in that pickup an economy overdrive ratio? With automatics we locked out the overdrive when pulling a load, even when they were new. Those trucks was never intended to charge up a hill with a heavy trailer at 1600 RPM in overdrive. If you can upshift and downshift to stay in the powerband when it's needed you may get better performance and better fuel economy than if it just lugs in overdrive.
If it helps, maybe use a tachometer and a vacuum gage to stay in the power band?
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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