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Seems to me most the overdrive automatics are not supposed to be used in overdrive when towing. There may be some exceptions, but I'd check into that before making a change.
It may also depend on what you mean by decent mileage. This is a big box you are pushing through the air. Its not going to get great mileage regardless of gearing.
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
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