The ‘Spanish’ Dodge Mk.2 range, announced in late 1977, was the first to be officially dubbed the ‘300 Series’ and was powered by an improved BS36 engine with a slightly lower output of 266bhp net at 2200rpm and 745lbf.ft of torque at 1400rpm. It incorporated a strengthened cylinder head with improved cooling and a new design of head gasket. Other improvements were made, notably to the injection pump and pipes, piston rings and cylinder liners, as well as having uprated water pump bearings and a strengthened inlet manifold. At the same time a Fuller Roadranger RTO 9509A nine-speed overdrive range-change gearbox became standard.
The main model for the UK was re-designated R3620P instead of K3820P, and now had a design gcw of 36 tonnes (35.9 tons). It
