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A Hydra-Matic 4L80 transmission at the Ypsilanti Automotive Heritage Museum. The 4L80-E (RPO MT1) is rated to handle engines with up to 440 ft·lbf (597 N·m) of torque. [2]
The General Motors Automatic Safety Transmission (AST) was a semi-automatic transmission released in 1937. The first mass-produced fully-automatic transmission developed for passenger automobile use was the GM Hydra-Matic introduced in the autumn of 1939 as a (very likely subsidized) $57 option for the 1940 Oldsmobile. [1]
The 4L80E (and its successor 4L85E) was the first Hydramatic to incorporate electronic controls — almost all of the THM400/3L80/3L80HD's components are interchangeable. Transmission fluid cooler line connections are found on the right-hand side of the THM400. The lower connection is the cooler feed, and the upper connection is the return. [1]
All engines were paired with a 4-speed overdrive automatic transmission, carried over from the previous van; the 1500 and light-duty 2500 series (below 8,500 pounds GVWR) used a 4L60E transmission while the heavy-duty 2500 and 3500 series (above 8,500 pounds GVWR) used a heavier-duty 4L80E unit.
For 1990, manual transmissions were discontinued and the four-speed automatic became standard equipment on nearly all body configurations; [4] for 1992, the 4L60E and 4L80E four-speed automatics replaced the three-speed automatics entirely.
Transmission broadcast codes in 2005 for the ECCC transmission are 5ABN and 5MMN. [1] The 4T80-E is a hydramatic transmission and was developed for use with V8 front-wheel-drive cars, and at the time exclusively the Cadillac Northstar engine. [3] It was designed with extreme power handling capabilities at the time.
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Callaway's answer was a turbocharged, fuel injected version of the original Stutz 5.0 liter DOHC straight eight that made more than 300 bhp at 3800 rpm. The modernized engine drove a GM Turbo-Hydramatic 4L80E. Suitable power and torque for a 6000-pound automobile.