5-Speed Gearbox Upgrade

Modifications and upgrades on classic cars are always going to be controversial; however, the owners of classic cars, understandably, want to get as much use out of them as possible. To that end, we have developed a range of modifications and upgrades for the XK120, XK140, XK150 and E-Type to make them more useable and pleasurable to drive in the modern day. These modifications have been developed to make the car look as standard as possible and maintain the 'connected', classic driving experience. This is, after all, a major reason for owning a Classic Jaguar.

This article will focus on our 5-speed gearbox conversion for the XK120, XK140, XK150 and E-Type. We have fitted, tested and worked with many different gearbox setups over the years. From XJ overdrive boxes to Getrag five-speed gearboxes we have tried most. We favour our current setup as it offers the optimum combination of usability and feel, flexibility of gear ratios, reliability and ease of fitment.

Our 5-speed gearbox modification fits the original XK bell housing. Using a modified adapter plate between the bell housing and gearbox it allows the clutch mechanism to be left totally original. Additionally, we offer a hydraulic clutch conversion for the XK120 and XK140 bringing them up to XK150 specification. The original knob can then be fitted to the new but original-looking gearstick. The gear stick comes out in almost the exact same place as the original Moss 'box leaving the interior of the car looking totally standard, such that no one could tell you a five-speed gearbox was fitted without looking under the car or driving it. We can also supply a new gear knob with the five-speed layout on for those who prefer that.

Another huge advantage of this five-speed 'box is that the combination of its size and the way it is fitted to the bell housing allows us to remove it through the car by taking out the interior and gearbox tunnel. This makes changing a clutch much quicker, easier and ultimately costs less than with the original Moss gearbox (which on most XK models requires the engine and gearbox to be removed as a whole to change the clutch).

Our 5-speed gearbox's feel direct, mechanical and in keeping with the period of the car, as opposed to the overly modern feeling, loose and vague alternatives available. These upgraded boxes allow for much quicker progression through the gears than the standard Moss gearbox ever did (let alone with worn synchro’s) and have synchromesh on all five gears allowing you to change down to first gear without coming to a complete halt.

If a 5-speed gearbox is not your cup of tea we also rebuild original Moss gearboxes and can even convert your Jaguar XK to have an overdrive gearbox if not originally fitted. Please get in touch for more information.

We offer an extensive range of other modifications and upgrades for the XK120, XK140, XK150 and E-Types. Please click here for more information.