SS Jaguar Mk IV 3½ Litre
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| Production | 1937–1948 3162 made |
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| Body style | 4-door saloon 2-door drophead coupé |
| Engine | 3,485 cc (3.5 l) I6 |
| Wheelbase | 120 in (3,050 mm) |
| Length | 186 in (4,720 mm) |
| Width | 66 in (1,680 mm) |
The 3½ Litre, introduced in 1938, was essentially the same body and chassis as the 2½ Litre but the larger 125 bhp engine gave better performance but at the expense of economy. The rear axle ratio was 4.25:1 as opposed to the 4.5:1 on the 2½ Litre.
The Jaguar Mark IV (pronounced mark four) is an automobile built by Jaguar from 1945 to 1949. It was a relaunch of a pre-Second World War model made by SS Cars Ltd from 1936.
Before the Second World War the name Jaguar was the model name given to the complete range of cars built by SS Cars Ltd. The saloons were titled SS Jaguar 1½ litre, 2½ litre or 3½ litre. The two-seater sports car was titled the SS Jaguar 100 2½ litre or 3½ litre.
After the war the company name was changed to Jaguar Cars Ltd. Although the post-war saloons were officially the Jaguar 1½ litre, 2½ litre etc., the term "Mark IV" was sometimes applied retrospectively by the trade to differentiate them from the officially named Mark V.
All the cars were built on a separate chassis frame with suspension by semi-elliptic leaf springs front and rear.
