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1955 Cj 5

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1955 CJ-5, the first year for this civilian body, was only available with a 134ci F-head four-cylinder engine. The swap to a Buick 231ci V-6 with two overdrives bumped mileage from 14.5 mpg with just the Warn 25 percent overdrive to 22-23 mpg highway with the Warn overdrive and an NV3550 fifth gear. The combination of two overdrives provides an equivalent 3.34:1 axle ratio, just right for 31-inch tires and a vehicle weight of 2,900 pounds.