Just like the clutch however, the overdrive's clutch can suffer damage or premature wear from continuous abuse. You can engage or disengage at any throttle just like you could engage or disengage the clutch under any load. If for any reason the overdrive does not disengage, do not reverse the car otherwise extensive damage may result. In certain driving conditions while traveling in third gear, the overdrive can be switched in to provide a top gear ratio or out to provide third gear acceleration without the necessity of manually moving the gear-change lever. Do not 'switch out' the overdrive when traveling at speeds exceeding normal third or top gear road speeds. If increased acceleration is required the overdrive can be 'switched out' without alteration to the throttle setting. Overdrive can be engaged at any throttle opening when in third or top gear. To engage overdrive move the switch lever towards the steering-wheel to disengage move the lever away from the steering-wheel.Īccelerator pedal pressure should be maintained and it is not necessary to depress the clutch pedal during engagement or disengagement. Overdrive instructions Questions, answers and reports on various technical subjects. My Austin-Healy model had this owned in Worked in all gears as already pointed out. I had the borg warner t85n in a 69 Ford F truck my grandfather left me and it was by far the most fun to drive because of the overdrive unit.
Gearvendors an aftermarket overdrive unit is also a laycock. Nothing beats the old hand-drawn illustrations wish we still had such publications. Other European car makers that used them include Ferrari and Bentley. I have a major thing for old Volvo and Merc wagons, especially diesels. It was one of those with the square push-button right on top of the shifter. Filed under: TechnicalTechnical Curiosities. Not too shabby for an obscure bit of engineering with a funny name. As all-in-one 5-speeds with integrated overdrive became de rigeurthe Laycock Overdrive faded from the scene. Transmission development has always been pricey, and as fuel economy began to become a priority for automakers, the idea of a fuel-saving external add-on to an existing 3- or 4-speed manual transmission was an appealing one.Ī 4-speed tranny became an 8 -speed, for instance. How I could I not write a post about an automotive component with a name like that? At the press of a button or flip of a switch depending on the car in the cockpit, the overdrive would engage and lower the engine speed relative to the driveshaft, markedly improving fuel economy. This one was used on a pretty wide variety of cars, but I had to include it because of the name.
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