General Motors released its first post-war truck 4x2 design, the Chevy Advance Design series, to the public on June 28, 1947. To increase the capability and versatility of 1947-1959 GM trucks, Northwestern Auto Parts Company (NAPCO) of Minneapolis developed a mostly bolt-on 4x4 conversion to convert ¾ and 1 ton GM 4x2 trucks to 4x4s (½ tons would be added in late 1955). The NAPCO 4x4 conversion, called the Powr Pak, was at first either dealer or customer installed. In 1956, GMC would offer the Powr Pak as a factory installed option on ½ to to 1 ton trucks and Chevy would follow in 1957. 1959 was the last year for the NAPCO 4x4 factory conversion for the Chevy and GMC, because starting with the 1960 model year, GM built their own factory 4x4 models.
The 1947-1959 GM NAPCO 4x4 trucks were quite capable performers and to this day are highly sought after by collectors and off-road enthusiasts. The value of these trucks was illustrated in 2012 when a 1959 GMC 1 ton flat-bed, one owner, unrestored 4x4 brought nearly $25,000 at a farm auction south of Laurel, Montana.
Shop and check Torque King's growing selection of parts for 1947-1959 GM NAPCO 4x4 trucks today.
1946-1959 GM H072 & H052 Rear Axle
1948-1959 GM SM420 Transmission Parts
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