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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 ...
The LD9 Twin Cam was a 2.4-liter Quad 4 variant which debuted in 1996 with balance shafts and a redesigned cylinder head. In the mid-1990s, these engines, like their earlier 2.3-liter counterparts, were known for timing chain failures, as well as water pump failures, in which the water pumps were often difficult and costly to access and replace.
In 2002, GMC celebrated its 100th anniversary and released a book entitled GMC: The First 100 Years, a complete history of the company. [ citation needed ] In 2007, GMC introduced the Acadia , a crossover SUV , which was the division's second unibody vehicle (after the Vandura) whose predecessor, the GMT-360 based Envoy , was discontinued with ...
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; 1992–1998 Rolls-Royce Silver Spirit/Spur II, III, IV; 1991–1992 Bentley Eight; 1991–1997 ...
The complex included GMC Truck & Coach Plant 1, 3, 4 and 5, as well as numerous administrative and support buildings. The last GM operations at the facility were closed, and the site completely demolished, in 2008. [2]
An electronic control unit (ECU), also known as an electronic control module (ECM), is an embedded system in automotive electronics that controls one or more of the electrical systems or subsystems in a car or other motor vehicle.
The engine block had 4.84-inch (123 mm) bore centers, two-bolt main bearing caps, a "side oiling" lubrication system (the main oil gallery located low on the driver's side of the crankcase), with full-flow oil filter, and interchangeable cylinder heads. Heads used on the high performance 409 and 427 engines had larger ports and valves than ...
In 1996, a bolt-on bell housing was phased in (along with a six-bolt tailhousing) for S-10 Trucks and S-10 Blazers and beginning in 1998 for all other applications. 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 ...