Complete Napco conversation kit out of a 1957 GMC 1/2 ton pickup. Everything you need to convert your 1955 to 1959 chevy or GMC pickup to 4x4. These kits were sold as dealer installed kits until GM built there own 4x4 in 1960. Bolts directly in only change will be driveline length depending on you wheel base. $5500.00 OBO.