The Mack R Model was a Class 8

Class 8

Class 8 may refer to:* 8 Metre * British Rail Class 08* BR Standard Class 8* First Class 8* GCR Class 8* HAZMAT Class 8 Corrosive Substances* L&YR Class 8* NSB Class 8, a standard-gauge steam locomotive of Norway...

 heavy-duty truck first introduced in 1966, by Mack Trucks

Mack Trucks

Mack Trucks is an American truck-manufacturing company and a former manufacturer of buses and trolley buses. A wholly owned subsidiary of Renault Véhicules Industriels since 1990, Mack Trucks is currently a subsidiary of AB Volvo. The company's headquarters are located in Greensboro, North Carolina...

, to replace the very successful Mack B Model

Mack B series

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...

. Its production ran for 40 years until the RD model was discontinued in 2002 and the RB and DM models were discontinued in 2005. The first R models introduced were powered by Mack Thermodyne diesel and gasoline engines. In 1973 the R cab was given a makeover to include a deeper rear wall for more room and a new dashboard design.

Model numbers & letters

• RB - Axle back (except in New Zealand - see NZ Mack RB)
• RD - Heavy Duty R
• RM - 4x4 Municipal/maintenance chassis
• RMM - 6x6 Municipal/maintenance chassis
• RS - Western R series, S stands for steel frame
• RL - Western R series, L stands for Aluminum frame
• RW - Western series, replaced by the Mack Super-Liner
  Mack Super-Liner
  The Mack Super-Liner is a class 8 heavy-duty truck that was introduced by Mack Trucks in 1977, to replace the Mack RW model. Its production lasted for fifteen years until it was discontinued in 1993. The model designation is RW...
  
  

• Chassis numbers (GVW Rating):
  • 4xx -
  • 6xx -
  • 7xx -
  • 8xx -

Note: the xx is the place holder for the engine code.

• Suffix letters:
  • T - Tractor
  • S - Six wheel chassis
  • L - Light weight components
  • X - Extreme duty