These sequential gearboxes are fully compatible with flat-shift ignition cut systems to allow full throttle gear changes, so unlike an H-pattern dog box, where lifting off the throttle is required, gear changes can be made with no noticeable interruption to power delivery. Shifting with a dog box is different to a synchro box in that gear changes need to be fast and positive rather than slow and smooth.įor those looking for the ultimate in fast gear changes, our range of sequential gearboxes is the logical progression from H-pattern gearboxes, offering ultra-fast gear changes through use of Quaife’s proven drum change technology. The ability to shift gear without using the clutch reduces the time spent off the power and allows drivers to get back on the power sooner, resulting in faster overall race times. Many of these dog boxes still use the same ratios as the synchromesh boxes. These are the next progression from a synchromesh gearbox, and are for those looking to decrease the time spent shifting gear by removing the necessity of operating the clutch for each gear change. For product selection advice, please contact the Quaife Technical Sales Team.Quaife’s range of Clubman and heavy duty H-pattern synchromesh gearboxes retain the standard synchromesh engagement parts from the original gearboxes, and offer optimised gear ratios for motorsport to make the most of the power and torque from the engine in any given gear. We invite you to explore Quaife’s gearbox range by clicking the banner below. For historic users, Quaife offers a ZF replacement transaxle, designed for use in GT40 and De Tomaso Pantera fitments. With close ties to the motorsport sector, Quaife has developed its transmission range with popular fitments in mind, including rear wheel drive Ford applications, plus the Porsche 997, Nissan Skyline R32-R34, Land Rover/Range Rover and many more. The inherent performance advantages of the ultra-rapid sequential shift are greatly in demand, which explains why a significant proportion of Quaife’s heavy duty gearbox range is now designed from the outset to incorporate this system. Having pioneered the sequential gearshift in the late 1980’s, Quaife has proactively continued to develop and refine its sequential gearbox technology to improve reliability and to adopt integrated electronic paddleshift systems. A direct replacement for the factory ‘H’-pattern transmission, the Quaife QBE6U sequential gear kit utilises the original Mitsubishi bell housing, with the addition of a bespoke cast outer case containing a state of the art. Three QRE8J final drive ratios are available in addition to an electronic gear position indicator. Assembled 2WD K-Series Quaife QBE8J / QKE8J 5-Speed Sequential Gearbox. The Quaife K-Series kits include the transmission and housing, gear shifter and cable. Quaife is reactive to external requirements and is constantly evolving its gearbox range to suit market demands. An optional Quaife QDF17U K-Series LSD is also available for 28T DSS upgraded driveshafts. Numerous bellhousings for popular engines are available from stock to enable the easy installation of Quaife’s in-line transmission range into a variety of vehicles, as is a range of accessories, including a choice of gear levers to suit individual requirements. Irrespective of selection method, Quaife’s close-ratio gears reduce the rev drops between gearshifts enabling even highly tuned engines to stay operating in their optimum power-band at all times, while the choice of gear ratios and final drives (where available) allows users to fine tune gearing to suit their particular requirements. Dog engagement enables rapid ratio selection without the performance or wear compromises of the synchromesh mechanism and is largely intended for motorsport use, whereas the helical variants of Quaife gearboxes are equally at home in a road environment. Quaife’s motorsport gearbox range includes complete replacement in-line, transaxle and four-wheel drive transmissions, offering five, six and seven-speeds depending on application, with a choice of synchromesh or dog engagement and helical or straight cut (spur) gears. K-Series AWD BILLET Sequential Complete Trans. Designed using the latest FEA 3D software, precision engineered using state of the art CNC machinery, assembled by skilled and experienced technicians, tested, refined and perfected using all of the firm’s considerable drivetrain expertise, Quaife motorsport gearboxes offer unrivalled reliability, performance and value for money for racing, rallying, drag, trackday and fast road use.
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