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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.
1999–2002 Silverado 1500 Extended Cab 2001–2002 Silverado 2500HD Regular Cab. The light-duty trucks used the 1500 and 2500 names. They are available in three cab lengths: a 2-door standard/regular cab, 3- or 4-door extended cab, and for 2004, a full front-hinged 4-door crew cab (derived from the 2001 HD trucks).
First-generation Chevrolet Silverado 2500HD (2001–02 Regular Cab) The GMT800 Silverado/Sierra 1500 and 2500 pickup trucks were released in August 1998 as 1999 models. The "classic" light-duty GMT400 C/K trucks continued to be produced for the first two years alongside the new models, and the Heavy-Duty GMT400 pickups (alongside the GMT400 SUVs) were continued until 2000, with the new GMT800 ...
When it is switched on, an automatic transmission can shift into overdrive mode after a certain speed is reached (usually 70+ km/h [40-45 mph or more] depending on the load). When it is off, the automatic transmission shifting is limited to the lower gears. Overdrive should usually be selected when the average speed is above 70 km/h (40-45 mph).
1991–2007 Chevrolet C/K/Chevrolet Silverado/GMC Sierra 2500 and 3500; 1991–2007 Chevrolet/GMC Suburban/GMC Yukon XL 1500 and 2500; 1991–2009 Chevrolet Van/Chevrolet Express/GMC Savana 2500 and 3500; 1995–1999 Chevrolet Tahoe/GMC Yukon 6.5L Diesel; 2002–2006 Chevrolet Avalanche 2500; 1992–2006 Hummer H1
A 4-speed overdrive automatic was an option on all engines (for 1500- and 2500-series vehicles); a 3-speed automatic was also offered (and was the sole automatic for 3500-series trucks). [ 8 ] For 1991, the THM400 gained a 4th gear and electronic controls, becoming the 4L80-E ; designed for applications over 8,600 lb GVWR, the transmission was ...
It should have no effect to the overdrive: In other words driving with overdrive off your vehicle consumes more fuel wether you use cruise control or not. As stated before, in this case overdrive should be used unless extra pulling power is required... —Preceding unsigned comment added by 80.223.93.188 23:56, 6 January 2009 (UTC)
A new "Generation 4" 1000 was introduced in 2005 that added a 6th gear at the very top of the ratio ladder, making it a double-overdrive. For the 2006 model year, manual gear selection was introduced. This feature gives the driver greater control over the transmission, enhancing operation when engine braking or less frequent shifting is desired.