Model '38 ma całkowicie stalowe nadwozie, w którym wyeliminowano elementy drewniane. Przy tej okazji zwiększono rozstaw osi do 305 cm, a długość do 472 cm. Oprócz wersji 2,5 Litre wprowadzono odmianę 3,5 Litre, ze 125-konnym silnikiem R6.

SS Jaguar 100 sold at £395 and has basically the same 19.8 HP engine (2663.7-cc, 73x106 mm) as the firm's 2½-Litre Saloon. Wheelbase is 8 ft 6 in, tyre size 5.25-18.
Jaguar 2½-Litre is a very elegant sports saloon. It was first introduced in 1936 and was the first SS for which the name Jaguar was used. Its 2663.7-cc engine is made by Standard. A 1½-Litre variant is also available.