New Rocket heavy duty four-speed gearbox from Tran-X improves the Ford ‘box’s known weak points and is rated to 270bhp featuring increased gear sizes, all running on ‘caged’ needle roller bearings, while it utilises Tran-X’s new beefy main shaft with larger spigot bearing.

The lay-gear is also of the ‘caged’ type and the gearbox is more efficient with better reliability at higher rpm with a stronger third to fourth gear ‘hub’ area, a known hotspot on Rocket ‘boxes.

All gears have oil holes pre-drilled into them, with grooves cut into the lay-shaft bores thus forcing oil to the gear teeth where it really needs to be.

The Tran-X heavy duty Rocket gearbox costs £2050 (steel main case) or £2150 (alloy main case) while it also requires the customer to supply a ‘donor’ gearbox.

More information from ENDS.