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The J-type overdrive was introduced in the late 1960s, and was adapted to fit Volvo, Triumph, Vauxhall/Opel, American Motors and Chrysler motorcars, and Ford Transit vans. The P-type overdrive marked the last updates and was manufactured in a Gear Vendors U.S. version and a Volvo version.
Aisin automatic transmissions are manufactured by Aisin-Warner (AW) which was established in 1969 as a joint venture between Aisin and BorgWarner.While Aisin Seiki manufactures a variety of automotive components including automatic transmissions for heavy duty vehicle applications, Aisin AW manufactures automatic transmissions for light vehicle applications, including hybrid electric vehicle ...
Before this, the company used semi-automatic systems like a vacuum-powered shifting for overdrive or the "Hydrak" hydraulic automatic clutch system. Alternatively, they bought automatic transmissions of other vendors, such as the Detroit gear 3-speed automatic transmission from BorgWarner for the 300 c and 300 d (not to be confused with the ...
The AOD (automatic overdrive) is a four-speed automatic transmission, with the 4th gear as overdrive. Introduced in 1980, it was Ford 's first four-speed automatic overdrive transmission. The gearset design is based on the Ford "X" automatic transmissions used during the 1950s, '60s, and '70s.
Beginning in 1982, it gained a locking torque converter (L3N71b) for greater efficiency. (See L3N71 link below). It gained an overdrive section in 1983 (L4N71b), culminating with preliminary electronic sensors and control functions being added in 1985 (E4N71b), and proceeding with the initial "R" for "rear wheel drive" with the RL4R01A/RE4R01A.
I was always under the impression that it's called an "overdrive" because it has a gear ratio of OVER 1:1. Before that, the top gear ratio for automobiles was 1:1. Thus, adding a fifth, higher ratio (0.75:1, etc), makes it an "overdrive" transmission.
Renowned for high-performance strength and durability, the Toploader (particularly the four-speed) equipped such sought after "A-list" cars as the Mustang, Talladega, AC Cobra, AC Frua and Sunbeam Tiger as well as the Ford Fairlane, Falcon, Galaxie, Ranchero, Torino, Bronco and the Mercury Comet, Caliente, Cyclone, (Mercury Cougar 1967 1973) and Marauder.
An overdrive is sometimes mistakenly called a freewheel, but is otherwise unrelated. The condition of a driven shaft spinning faster than its driveshaft exists in most bicycles when the rider stops pedaling. In a fixed-gear bicycle, without a freewheel, the rear wheel drives the pedals around.