In view of the increasing popularity of high cabs in the maximum weight long distance category, such as the Leyland Marathon, Scania L110 and Volvo F88, Bedford designed the TM as a competitor.

The Fuller transmissions now received a new telescopic shift mechanism, allowing for a sealed cabin floor.

[3] Through its lifespan, it was available with a Bedford 500 turbo engine also known as the 8.2 Blue, a Detroit Diesel two-stroke V6 and V8 or a Cummins L10, coupled to either a Fuller or Spicer transmission, and a SOMA rear axle (dropped after the 1982 facelift).

Because of its high-revving characteristics, it proved unpopular with drivers, who were used to slow revving, long stroke, UK diesels.

[3][5] Available as either an articulated tractor unit, or as a rigid, in either wide or narrow day and sleeper cabs, the TM was actually a highly competent vehicle, and over the years was a common sight with some of the larger UK operators.