This is operated hydraulically by two pistons which push against two bridge pieces spring loaded against the bearing carrier. Next was the bearing carrier for the cone clutch. First off was to remove the rear case from the main case which pulls apart to separate the main case, brake ring and rear case. Much better for cruising.Īs I’d already stripped the gearbox down, the overdrive was removed and ready to be worked on. It basically consists of an epicyclic gear system which allows the input shaft to reduce speed by about 25% in 3rd and 4th gears. Mine always worked quite well so I wasn’t expecting to find anything particularly out of order. It’s a Laycock J type used on many cars of the era. version and all spares for J and P types worldwide.Once the gearbox was complete the overdrive was next up. of El Cajon, California purchased all the overdrive assets of GKN to continue production of the U.S. Over a period of 40 years, Laycock Engineering manufactured over three and a half million overdrive Units, and over one million of these were fitted to Volvo motorcars. version uses a larger 1.375 outer diameter output shaft for higher capacity and a longer rear case. The Volvo version kept the same package size as the J-type but with the updated 18 element freewheel and stronger splines through the planet carrier. The P-type overdrive marked the last updates and included both a Gear Vendors U.S. The J-type overdrive was introduced in the early 1970s, and was adapted to fit Volvo, Triumph, Vauxhall/Opel, American Motors and Chrysler motorcars, and Ford Transit vans. In 1959, the Laycock Engineering Company introduced the D-type overdrive, which was fitted to a variety of motor cars including Volvo 1s, Sunbeam Alpines and Rapiers, Triumph Spitfires, and also early 3-synchro MGBs.įrom 1967 the LH-type overdrive was introduced, and this featured in a variety of models, including 4-synchro MGBs, the Ford Zephyr, early Reliant Scimitars, TVRs, and Gilberns. Later the A-type overdrive was to be fitted to the entire range of TR cars. Several famous marques used A-type overdrives, including Jaguar, Aston Martin, Ferrari, Austin-Healey, Jensen, Bristol, AC and Armstrong Siddeley. The first unit to be created was the A-type overdrive, this was fitted to many sports cars during the 1950s. The first production vehicle to feature the Laycock system was the 1948 Standard Vanguard Saloon.
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