The Fordson Thames Trader was built until 1957 under the Fordson name. It was called the Ford Thames Trader until 1965.
The Fordson New Major was not based on a Fordson truck engine from the 40s. The Major diesel engine was designed specifically for the tractor. It was put in 4D trucks in 1953 or 1954,a year or 2 after the tractor started production.