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In drag racing, a transbrake is a mechanism that selectively places the transmission in a forward and reverse gear simultaneously. This allows the engine to create full power without transmitting that power through the driveline, allowing the car to stay in one place.
The C4 was designed to be a lighter and simpler replacement for the original Ford-O-Matic two speed transmission being used in smaller, less powerful cars. Ford used the term "SelectShift" because in the first C4's, placing the gear selector in D2 forced the transmission to start in second gear and then shift to third gear.
Ford Capri 1.6, 2.0 1983 onwards, Capri 2.8 1982 onwards, Ford Sierra 1.6, 1.8, 2.0, Sierra XR4i, Sierra XR4x4 2.8, Merkur XR4Ti; New Process 435 heavy duty 4 speed transmission; Clark / Tremec 4 speed OD and SROD; Tremec or Borg-Warner transmissions Borg-Warner T-18/T-19 transmissions - circa 1966–1991 Ford F-Series
Beside the new layout the number of pinions is doubled from 3 to 6 to handle the much higher torque of the big block V8 engine. After the satisfactory experience with the new design, it was adopted in 1967 for the new core model K4C 025 (Type 722.2) of the first automatic transmission series from Mercedes-Benz.
A transmission solenoid or cylinoid is an electro-hydraulic valve that controls fluid flow into and throughout an automatic transmission. Solenoids can be normally open or normally closed. They operate via a voltage or current supplied by the transmission computer or controller.
The 4L80-E uses two shift solenoids, initially called Shift Solenoid A and Shift Solenoid B; they were later changed to comply with OBD-II regulations to 1-2 shift solenoid and 2-3 shift solenoid. By activating and deactivating the solenoids in a predetermined pattern by the PCM, four distinct gear ratios can be achieved.
The delay box acts as an on-board timer for the transbrake (from transmission brake). A transbrake is a part of a racing automatic transmission used in drag racing, and are not found in manual transmissions. The electronic timer is packaged in a metal enclosure when sold to drag racers, thus the slang term delay box.
It is derived from the Tremec T-56 6-speed manual transmission. As usual, the forward helical cut gears are synchronized. As usual, the forward helical cut gears are synchronized. However, the reverse gear operates through a fully synchronized constant-mesh system.