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This was a later model of the 125 that debuted for 1982 and included a torque converter clutch or TCC. The TCC acts similar to a clutch in a manual transmission vehicle, in that at speeds above 35 MPH a combination of engine vacuum- and temperature-sensing valves, and a dedicated brake switch - and in later models an ECU - activated a solenoid which engaged a clutch physically locking the ...
Once fully locked, the torque converter no longer applies torque multiplication and will spin at the same speed as the engine. This provides a major increase in fuel economy. Modern designs provide partial lockup in lower gears to improve fuel economy further, but this can increase wear on the clutch components.
For the 1981 model year, a lock-up torque converter was introduced which coincided with the new EMC control of most GM cars; this version is the THM350-C, which was phased out in 1984 in GM passenger cars for the 700R4. Chevrolet/GMC trucks and vans used the THM350-C until 1986. The lock-up torque converter was unpopular with transmission builders.
6 Variable Force Solenoids · 1 for each clutch · 1 for TCC Torque converter clutch Variable Force Solenoid ECCC · 2 path · turbine damper Converter size 238 mm (9.37 in) 258 mm (10.16 in) Fluid type DEXRON High Performance ATF Fluid capacity 10.8 L (11.4 US qt) [a] 10.3 L (10.9 US qt) [b] Weight 80 kg (176 lb) [a] 98.9 kg (218 lb) [b]
The 4T80-E transmission is electronically controlled and features an automatic overdrive transaxle with an electronically controlled torque converter clutch. The 4T80 originally used a viscous clutch, but this was changed in 2005 to ECCC. [1] [4] [2] [3] The 4T80 is built at Willow Run Transmission in Ypsilanti, Michigan.
The equation expands to include the fifth power of radius; as a result, torque converter properties are very dependent on the size of the device. Mathematical formulations for the torque converter are available from several authors. [1] [2] Hrovat derived the equations of the pump, turbine, stator, and conservation of energy.
Beginning in 1998 a new 300mm torque converter with improved higher-capacity internals, 300mm style input shaft, and 300mm style pump was also introduced on models coupled to a Gen III Small Block. The 4L60E is rated to handle up to 360 ft⋅lb (490 N⋅m) of torque. It weighs 133 pounds without transmission fluid. [1]
The last application was the 2011 Chevrolet Impala as GM has transitioned to the 6T70 family transmissions for 2012. [2] [3] Models: M15 — 245 mm (9.6 in) torque converter; MN3 — 258 mm (10.2 in) torque converter; MN7 — 258 mm (10.2 in) torque converter and heavy-duty gearbox (see 4T65E-HD) MD7 — 245 mm (9.6 in) torque converter ...