I believe that on that vintage truck the button cancels overdrive as opposed to delaying the shifts like on newer trucks. Trailer towing is exactly what that button is there for. It would not be worth the additional wear that it would put on your transmission to save a few gallons of gas. I tow a few different trailers, and I don't press the button when towing the lightest one but I do for the heavier ones. If you know that you had a long downhill / level grade ahead of you it should be OK but otherwise leave the OD off.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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