[3] Ford purchased Briggs in 1953, meaning Leyland (and Dodge) were forced to develop new cabs.

Maximum weight was increased to 12 long tons (12,200 kg); models for tropical zones received a considerably lower rating.

Ashok Leyland proceeded to develop a simplified local cab design and continued to build the Comet into the 1990s.

Introduced in 1964, the fourth generation Comet used the Ergomatic cab, as also used by a number of other Leyland models and other British truck manufacturers in Leyland Motor Corporation, the Ergomatic was built by GKN-Sankey while the LAD was the work of Motor Panels.

As before, the model was intended specifically for export markets, primarily in the developing world, with simplified equipment, fewer gears, and a sturdy construction.

The design was an all-metal version of the C44 Roadrunner, again simplified in order to make local assembly easier.

[8] Models ranging from 9 to 13 long tons (9,100 to 13,200 kg) received the 115 hp (86 kW) 6-98 NV engine.

The Caribbean, Central America, Taiwan, the Philippines, Malaysia, Thailand and Singapore also received some Comets.