Mack duplex (5x2), triplex (5x3) or quadruplex (5x4) manual transmissions
The Mack B Model was a heavy truck produced by Mack Trucks between 1953 and 1966. It is perhaps the best known classic Mack truck and many still survive to this day in both restored and non restored conditions. Some owners still use them daily for both business and leisure. They were available as fire trucks, school buses and in a variety of truck configurations. The B model was replaced by the R Model.