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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]
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.
Many TCUs now have an input from the vehicle's traction control system. If the TCS detects unfavourable road conditions, a signal is sent to the TCU. The TCU can modify shift programmes by upshifting early, eliminating the torque converter lock-up clutch application, and also eliminating the first gear totally and pulling off in 2nd. [4]
The "70" may also refer to the transmission's torque capacity after torque converter multiplication which occurs at low RPM when the torque converter is more "elastic". 4R70W indicates 4 gears, Rear wheel drive and Wider gear ratio compared to the AODE. The gear ratios are: First: 2.84 :1; Second: 1.55 :1; Third: 1.00 :1; Overdrive: 0.70 :1 ...
A handfull of other enhancements, part throttle 3rd gear tcc lockup was a big quality of life enhancement. The base design from the original Torqueflite remains essentially unchanged. The addition of a two-speed output shaft (overdrive unit) that is bolted to the back of the three-speed transmission has only two ratios: direct (1:1) and ...
The hydrodynamic torque converter was largely taken over from the previous 7G-Tronic transmission. It has a torque converter lock-up clutch and a twin-turbine harmonic damper with centrifugal pendulum absorber technology. [8] The torque converter lock-up can operate in all 9 forward gears.
Hydramatic transmissions were ultimately replaced by a new three-speed torque converter automatic transmission called Turbo-Hydramatic in 1964 and 1965, whose design was more similar in principle to the Chrysler TorqueFlite and the '51 Borg-Warner-designed Ford Cruise-O-Matic than the fluid coupling Hydra-Matic the "Turbo" replaced.
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