Also, the NAPCO 4WD units were line-installed in GM 1/2 & 3/4T trucks from late 1957-59, using a Dana 23 transfer case...
The NAPCO front ends for 1/2 & 3/4T were discontinued after 1959, replaced by the Dana 44 for 1/2 & 3/4T from 1960 on until 1977-80.
Chevrolet also offered the NAPCO 4WD 1-ton trucks from 57-59 with a 3500 pound axle rating...
Mike B
