I hoped that it would all just bolt onto my existing GT6 gearbox and with a change over of the rear propshaft flange be a straight forward fit. OK as you can see there is no provision for a speedo drive output, (the volvo speedo is driven via a propshaft sensor) I would cross that one when I had too. It was described as a new old stock unit that had been in storage for some time and possibly kicked around the garage floor a bit too!!! Looking through ebay I spotted this unit and thought it looked very similar to the J/Type fitted to my GT6. Suggesting that the last and possibly the best unit made was a P/Type overdrive for the Volvo fitted to the 740 turbo of around 160bhp and 175 ft/lb torque. 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 1962-1967 MGBs (those with 3-synchro transmissions).įrom 1967 the LH-type overdrive was introduced, and this featured in a variety of models, including 1968-1980 MGBs, the MGC, 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. As one or two of you may know I was having overdrive problems just before the last 10CR and tried (unsuccessfully) to fix it at the time.Īfter the run when it gave up completely I started to look around for a replacement unit and found this info on wikipedia,
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