85mm shaft centres to handle up to 450bhp.Straight cut gears with sequential dog engagement.Major critical dimensions as per Porsche 997 sequential gearbox.Key features of the Quaife QBE85G Porsche 997 six-speed sequential transaxle gearbox include: ![]() QBE85G can also be retro fitted to Porsche 996 models (with heat exchanger) – additional parts are required for the installation. QBE85G is fully compatible with the OEM Porsche 997 motorsport electronics and Porsche wiring loom, avoiding any issues with internal displays or the flatshift ignition cut-off switch. The bellhousing design is integrated into the main gearbox casing to suit 996 / 997 / RSR fitment and for use in 997 models, the original Porsche clutch and flywheel are retained. Quaife’s use of a hypoid crownwheel and pinion ensures maximum strength and minimum gear noise from the QBE85G’s final drive. A Porsche Motorsport plate type limited-slip differential is supplied as standard and the unit is lubricated via an internal oil pump that reuses the stock Porsche 997 heat exchanger, which bolts directly to the Quaife QBE85G gearbox. The QBE85G six-speed sequential transaxle features a large 85mm shaft centre configuration and straight-cut gears, capable of transmitting up to 450bhp. 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. Designed to ensure the optimum blend of performance and ease of installation, race testing has proven that the QBE85G offers exceptional durability compared to its Porsche equivalent. It can also fit 996 models with the use of an adapter kit. A joint development between Quaife and Porsche specialist Parr UK, QBE85G is an uprated direct replacement for the factory 997 sequential gearbox.
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