Jaguar XK140: the XK120 finished properly (1954–1957) The Jaguar XK140 took the sensational XK120 and fixed everything owners had grumbled about, rack-and-pinion steering, cabin room, cooling, without losing the looks or the pace. A guide to the roadster, drophead and fixed head coupe, the SE upgrades, what year XK to avoid and why, and what an XK140 is worth today.