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The 4L60E is the electronically commanded evolution of the Turbo-Hydramatic 700R4, originally produced in 1982. The 4L60E and 4L65E are built at Toledo Transmission in Toledo, Ohio and have also been built at Romulus Transmission in Romulus, Michigan and Ramos Arizpe, Mexico. The two transmissions cannot be differentiated from the outside.
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.
At stall, the torque converter can produce maximum torque multiplication if sufficient input power is applied (the resulting multiplication is called the stall ratio). The stall phase actually lasts for a brief period when the load (e.g., vehicle) initially starts to move, as there will be a very large difference between pump and turbine speed.
For example, a 1995 Beretta features a 1650 rpm stall converter as opposed to a 1999 Century converter with a stall of 2095 rpm. In the 4T60 family of transmissions, the combination of drive-chain sprocket ratios and the differential gear ratio together offer up to 12 different possible final drive ratios to allow the transmission family to ...
In the early 1950s, BorgWarner developed a series of three-speed torque converter automatics for car manufacturers such as American Motors, Ford and Studebaker. Chrysler was late in developing its own true automatic, introducing the two-speed torque converter PowerFlite in 1953, and the three-speed TorqueFlite in 1956. The latter was the first ...
The 2500 series was available with the 5.7L or 7.4L V8 gasoline engine, or the 6.5L V8 diesel engine, and came with a GVWR of 8,600 pounds. The 3500 series came standard with dual rear wheels (the only short-bed GM pickup to have such a feature), a 7.4L V8 (or a 6.5L V8 diesel), and a 9,400 pound GVWR.