NAPCO (Northwestern Auto Parts Company)
Check out "1940s" & "1950".Prior to 1955 NAPCO Power-Pak conversions were done on 3/4 and one ton GMC and Chevrolet chassis.
"The entire differential of the front wheel assembly is the same as the original factory equipped Chevrolet truck rear axle drive."
Supposedly the installation was relatively simple and any dealer with a service center could install this package.
In the 1954 Silver Book, I do not see a specific mention of installing this package on a truck larger than a 1-ton. The front differential had to match the original rear differential?
I do not have a 1955 1st Series Silver Book.
The American-Coleman Co. also provided 4-wheel drive conversions in 1954. These were available for 3/4 to through 2-ton models (with single rear axles). An American-Coleman Co. 4-wheel drive COE conversion is shown in the 1953 Silver Book.
American Coleman also shows a 6x6 conversion in the 1955 Task Force Trucks Silver Book.
