Automatic transmissions and transaxles pdf
Torqueflites use a torque converter and the Simpson gearset, two identical planetary gearsets sharing a common sun gear. Automatic transmissions and transaxles pdf Corporation licensed this gearset from Simpson in 1955.
The first Torqueflites provided three speeds forward plus reverse. The transmission was controlled by a series of pushbuttons located on the vehicle’s dashboard. The buttons were generally at the extreme driver’s side end of the dash, i. Moving the lever to the “Park” position placed the car into Neutral and engaged a lock pawl on the transmission’s output shaft. Moving the park lever out of “Park” position unlocked the shift buttons so that a driving range could be selected.
Like a vehicle with a General Motors Hydramatic, a vehicle with a Torqueflite transmission starts out in first gear when the Drive or Second position is selected. 1962 brought the addition of a canister-style fluid filter installed in the cooler line. For 1964, the canister filter was eliminated, and the transmission’s internal intake screen was replaced by an efficient Dacron filter. Chrysler engineers reasoned that improved electrical and fuel systems reduced the need to push-start vehicles, and safety concerns weighed against doing so. In 1968, part-throttle downshift functionality was added to A-904 transmissions used with 6-cylinder engines.
This feature permitted the transmission to shift from third to second gear in response to moderate accelerator pressure. Previously, an automatic 3-2 downshift occurred only if the driver pushed the accelerator to the floor. This change was made to maintain acceptable in-town performance with taller final-drive ratios in the rear axle — 2. In 1978, most Torqueflite transmissions gained a lockup torque converter clutch to mechanically connect the converter’s impeller and turbine, eliminating slip for better highway fuel economy.
This addition required the removal of the torque converter drain plug. For 1980, a wide-ratio gearset was released for the A904, A998 and A999, with 2. Torqueflite transmissions and transaxles made through 1991 were assigned arbitrary engineering designations consisting of the letter “A” followed by three digits. The A727 incorporated a parking pawl, with the sole exception of the 1962 Chrysler version, which had an extension-mounted drum brake. The RG application involved a factory adapter plate.
A727 derivative with overdrive, in the A500 ilk. Starting in 1990, it was used in some trucks and vans. The overdrive fourth gear ratio is 0. X-1995 Dodge Ram Van 2500 5. It was used in trucks and vans starting in the mid-1990s.
84 Jeep DJ-5M with AMC 2. 1994-1995 Jeep Wrangler YJ with 4 cylinder engine. 1997-2002 Jeep Wrangler TJ with 4 cylinder engine. The A998, later renamed 31RH was a medium-duty, narrow or wide-ratio version of the small-frame A904 transmission for use with medium-power V8 engines and the 3. It was equipped with four direct friction plates. This transmission differed from the A904 by having a re-enforced case and internals. 00:1 and wide ratios are 2.
1972-1988 AMC 6 cylinder and 304 V8 engines. A904 transmission for use with medium-power V8 engines and the 3. It was equipped with five direct friction plates. These automatics had lower first and second gear ratios to allow the lower-powered engines to provide better acceleration without sacrificing highway fuel economy. 1994-2003 Dodge Ram Van B150 with Magnum 3.
1994-2003 Dodge Dakota with Magnum 3. 1987-1995 Jeep Wrangler YJ with 6 cylinder engine. 1997-2002 Jeep Wrangler TJ with 6 cylinder engine. A904 derivative used in trucks and vans.
Introduced in the 1989 model year on a limited basis, it was the first light-duty Chrysler four-speed automatic and was placed behind the 3. 1998-2000 Aston Martin Virage V8 5. The A404, A413, A470, and A670 are front wheel drive transaxle derivatives of the A904 Torqueflite. The light-duty A404 was used with the smallest straight-4 engines from Chrysler, commonly the 1. This was used with Chrysler’s 2. It was available both with and without a lockup torque converter.
The A415 was developed for the 1. 6 L Simca 1100 engine, but was not released for series production. The A470 was a strengthened version of the transaxle used with the 2. 6 L Mitsubishi Astron engine in the K-cars from 1981 to 1985 and minivans from 1984 through 1987. The highest-specification three-speed transaxle was the A670. It was used with the 3.