I doubt you will find to many people towing with that low of gear even though you would certainly have more power. There is a lot of difference between 373 and 430 gears. Most would have 410 gears or higher like what you have. The 410's would certainly lower your mileage probably 2 or 3 miles to the gallon. There is no substitute for diesel's but if you have a late model truck then you might be better off keeping it. Just remember if you have an 4 wheel drive then you have to change both front and rear gears which might be cost ineffective.
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