I had a Dodge 440 and the Dodge 737 three speed transmission on a 1976 Landau motor home. That 737 transmission was super strong. 166,000 miles, on transmission rebuild at 100,000 miles, and it was my fault it broke. If your thinking better gas mileage, forget it. My motor home was on a M-500 Dodge chassis, all motor homes of that era were either on a M-400, 500, or 600 chassis depending on it's size, and they all came with 8R19.5 tires, are you sure they are 17.5?
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