Laycock J-Type Overdrive Service Manual

The Laycock J-Type overdrive was introduced in the late 1960s, and it revolutionized the way drivers controlled their gears. Through a system of oil pressure, solenoids, and pistons, the overdrive would drop the revs on whatever gears it was used on by 22% (.778). This innovative technology allowed for smoother shifting and more efficient gear changes.

The J-Type overdrive features an oil pressure-operated device attached to the back of the standard gearbox operating on the gearbox output shaft. This design enables the overdrive unit to seamlessly integrate with various vehicle makes, including Volvo, Triumph, Vauxhall/Opel, American Motors, Chrysler, and Ford Transit vans.

Over a period of 40 years, Laycock Engineering manufactured over three and a half million overdrive Units, with over one million of these units fitted to Volvo motorcars. The J-Type overdrive's popularity can be attributed to its reliability, ease of use, and adaptability to various vehicle models.

The Laycock J-Type overdrive was also used in other iconic vehicles, such as the MGB, Sunbeam Alpines and Rapiers, Triumph Spitfires, and Ford Zephyr. Its legacy continues to be felt in the world of motoring, with many enthusiasts seeking out vintage vehicles equipped with this groundbreaking technology.

In summary, the Laycock J-Type overdrive is a testament to innovative engineering and design. Its ability to seamlessly integrate with various vehicle makes has made it a beloved component among car enthusiasts worldwide.

Laycock j type overdrive service manual