This had a constant-mesh gearbox with an individual electromagnetic clutch to engage each gear.

In 1899 the company introduced a motor tricycle with a "Dust proof" two-speed constant-mesh gearbox.

In 1924, they introduced the "Traffic Transmission," a constant-mesh gearbox that reduced the need for extra clutching when downshifting.

Searle patented and sold to LGOC for £1,000 an ingenious silent roller-chain constant-mesh gearbox.

The Mercedes-Benz colectivos had truck powerplants, a diesel engine with power transmitted to the rear axle by a five-speed constant-mesh gearbox.

The Titan PD3 chassis was modified, and a five speed heavy duty constant-mesh gearbox was used together with the Ashok Leyland version of the O.680 engine.

The now common constant-mesh gearboxes, which can include non-synchronised, or synchronized/synchromesh systems, where typically diagonal cut helical (or sometimes either straight-cut, or double-helical) gear sets are constantly "meshed" together, and a dog clutch is used for changing gears.

Two revisions to specification which were not accompanied by a change in specification number were from 1957 when an Albion five-speed constant-mesh gearbox became an option for manual-transmission chassis and from 1958 when the 105bhp 6.15 litre O375H engine became optional across the range.

The Bristol SU ("small, underfloor-engined") chassis featured the same Albion EN250 engine and BMC rear axle as the Albion Nimbus NS3AN with a David Brown overdrive-top five-speed constant-mesh gearbox and a front axle by Kirkstall.

The engine was mounted transversely and vertically as in the Dominator, but was a 130 bhp 5.7-litre Perkins T6.354 unit, this drove through the radical Avon Maxwell transmission, an automatic electronically controlled constant-mesh gearbox using small multi-plate clutch units to select drive ratios, this also did the jobs of retarder and angle-drive.