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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 4L80-E is rated to a maximum GVWR of 18,000 lb, depending on the axle and vehicle.
The police package (9C1) B-body cars featured a First Gear Block Out (FGBO) Plate on the transmission housing to prevent drivetrain damage. The shift point for first to second gear is about 43 MPH (69 km/h) while second to third gear shift point is about 83 MPH (134 km/h) assuming a 3.08:1 differential and a 5,500 RPM engine speed limit.
A transmission control unit (TCU), also known as a transmission control module (TCM), or a gearbox control unit (GCU), is a type of automotive ECU that is used to control electronic automatic transmissions. Similar systems are used in conjunction with various semi-automatic transmissions, purely for clutch automation and actuation.
The 1992–93 LT1s used speed density fuel management, batch-fire fuel injection and a dedicated Engine Control Module (ECM). In 1994 the LT1 switched to a mass airflow sensor and sequential port injection. A new, more capable computer controlled the transmission as well as the engine and got a new name: Powertrain Control Module (PCM). Where ...
The GMT900 series features standard vehicle stability control. Original plans called for American Axle 's "I-Ride" independent suspension module in the rear, but was never used. Tahoe production began at GM's Arlington Assembly plant in Arlington, Texas , on December 1, 2005, six weeks ahead of schedule. [ 2 ]
Complex includes GMC Truck & Coach Division Plants 1, 3, 4, and 5. Plant 1 was originally the plant of Rapid Motor Vehicle Company, one of the 2 main ancestors of the modern GMC Division (the other being Reliance Motor Car Company). Plant 1 was located at 25 Rapid Street and opened in 1906, before Rapid was taken over by GM in 1908-1909.