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The TH400 was phased out for the 1980 models, when the A-727 replaced the TH-400 as the only automatic transmission option for both the SJ Wagoneer/Cherokee wagons and the J-10/J-20 trucks. Internally similar to the Chrysler A-727, the case was one-piece, cast with an AMC pattern bellhousing (not interchangeable with a Chrysler pattern A-727).
The 48RE is an electronically governed, ECU-controlled, four-speed heavy-duty overdrive automatic transmission, that is stronger than its predecessor, the 47-series. The 48RE was introduced in 2004 to 3rd gen ram pickups with the 5.9 cummins, or the v10, some 03 and early 04 trucks still were equipped with 47RE units, and then came a 48re which ...
1982–1990 RL3F01A/RN3F01A — 3-speed transaxle; 1982–1985 RL4F01A — 4-speed transaxle; 1985–1994 RE4F02A/RL4F02A — 4-speed transaxle; 1991–2001 RE4F03A/RL4F03A — 4-speed transaxle; 1992–2001 RE4F04A/RE4F04V — 4-speed transaxle (aka GEO/Isuzu 4F20E/JF403E and Mazda LJ4A-EL) 3-speed ultra lightweight keicar Suzuki Alto, Mazda Carol
Mini F54, F55, F56, F57, F60 with 6-speed automatic (8-speed models use the AW F8 F35 transmission) BMW X1 (F48) with 3-cylinder engines 6-speed automatic (4-cylinder models use the 8-speed AW F8 F35 transmission) Aisin TF-70SC - 6-speed transverse; Aisin AW60T-6F25 Automatic, Fiat 500 Abarth, Fiat 500L, Jeep Commander (2022)
A transmission control unit (TCU), also known as a transmission control module (TCM), or a gearbox control unit (GCU), is a type of automotive ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely for clutch automation and actuation.
The hydraulic control system consists of a valve arrangement and an engine driven pump. The automatic transmission contains a planetary gear set consisting of two sun gears, two sets of three planet pinions contained within a planetary carrier and ring gear. Various speed ratios are obtained by holding or clutching various combinations of ...
A valve spool that controls output flow and pressure; In the steady-state condition, the typical VFS design intent is to control pressure by balancing three axial forces: A spring force due to spring compression by valve position; A magnetic force primarily due to regulated current through the solenoid coil
The system has the advantage that it is continuously variable rather than switching in at a set speed. Its disadvantage is the complexity of the system and corresponding price. Other systems will achieve similar results with less cost and simpler design (electronic control). For a more detailed description, see the sandsmuseum link below.