|GMC 4x4 history|
| 1956 GMC Trucks GMC started building 4x4 trucks on the assembly lines using NAPCO components. Chevrolet followed in 1957 releasing their first production 4x4 pickups in 1/2, 3/4 and 1 ton sizes. Prior to this, these trucks had 4x4 conversions done by NAPCO in which the trucks were sent out for a NAPCO Powr-Pak 4x4 conversion and then returned.
The first 'All GM' factory 4x4's were introduced in 1960 when both Chevy and GMC went to a totally new chassis. NAPCO and its Powr-Pak conversion were left out of the equation due to the introduction of GM's completely redesigned truck line featuring independent front suspension on the two wheel drive trucks and a 4-wheel drive specific chassis on the 4-wheel drive trucks.
There are stories of GM trucks being converted as early as late 1949, but the earliest documented truck known of is a 1951 Chevy 3/4 ton owned by Butch Gehrig of Odell, Oregon.
Until October 28th of 1954, when Chevrolet introduced the 1955 1st Series, all the conversions were done on 3/4 ton and larger trucks.
The 1954 and earlier Advance Design 1/2 ton models were not suitable for a NAPCO conversion due to the enclosed drive shaft design.
GMC and Chevrolet conversions were by far the most popular, though conversions were available for Ford, Studebaker and other manufacturers.
NAPCO reached an agreement with both GMC and Chevrolet to supply them with the Powr-Pak conversion kits, and GMC began to produce 4x4 trucks on the factory assembly line (using NAPCO components) starting in 1956, with Chevrolet following suite in 1957.
By the end of 1957 both GMC and Chevrolet trucks could be ordered from the factory with the NAPCO Powr-Pak conversion.
The first 'All GM' factory 4x4's were introduced in 1960 when both Chevrolet and GMC went to a totally new chassis.
NAPCO and its Powr-Pak conversion were left out of the equation due to the introduction of GM's completely redesigned truck line featuring independent front suspension on the two wheel drive trucks and a 4-wheel drive specific chassis on the 4-wheel drive trucks. This was the beginning of the end for the 4x4 conversion element of NAPCO.
Though they did produce conversion kits for a few more years, their main business shifted to the heavier trucks, 1-1/2 ton and larger.
After the huge loss of the contracts with GMC and Chevrolet to supply conversion packages, NAPCO sold the rights to the Powr-Pak package to the DANA Corporation .
All documentation, archives, information and parts were transferred to DANA at that time.
В 1990 г. на базе серии "515" начался выпуск пикапов Sonoma) и Syclone с двигателями V8 (280 л.с.), автоматической коробкой передач, антиблокировочной системой тормозов и постоянным приводом на все колеса. Через два года появились так называемые полноразмерные пикапы "Юкон" (Yukon), а в 1994 г. - серия "Сьерра" (Sierra) полной массой 2,8-6,8 т с двигателями мощностью 197-294 л.с., аналогичная пикапам "Шевроле С/К".
Although General Motors introduced its first pickup truck in 1930, the term "Silverado" was a designation only used to detail the higher-level trim for the Chevrolet "C/K" pickup trucks from 1975 through 1999. Similarly, GMC's line of "C/K" used the "Sierra" as the higher-level trim designation on its vehicles up until 1988. In 1988, GMC decided to use "Sierra" on all GMC pickup trucks, though the "C/K" nomenclature was continued through 1999. "C" trucks had 2WD while "K" models had 4WD. Both Chevrolet and GMC dropped the "C" and "K" designations in 1999.
The Syclone was a high-performance version of the GMC Sonoma pickup truck. Produced in 1991, the Syclone spawned the similarly powered 1992-1993 GMC Typhoon SUV. Another vehicle, the GMC Sonoma GT, offered less performance but was seen as a companion model.
All this was bolted up to general motors famous automatic 700R4 (4L60) trans and into a Borg Warner AWD 1372/4472 transfer case power split was 35% to the front wheels and 65% to the rear. The syclone was the very first production truck to feature four wheel ABS brakes. The suspension was beefed up form the factory verses the Sonama’s that the truck was based on
Introduced in the early ’90s, the full-size Yukon sport-utility has gone from being a two-door 4x4 with a maximum passenger capacity of six to a four-door SUV with a choice of two- or four-wheel drive and seating for up to nine.
The full-size 2010 GMC Yukon offers seating arrangements for five to 9 passengers, and is available in three trim levels: basic SLE, upscale SLT along with the ultra-luxurious Denali.
IT uses a pair of V8 engines. All but the Denali boast a 5.3-liter V8 with 320 hp and 335 pound-feet of torque. This engine features GM’s displacement-on-demand cylinder-deactivation technology and sends its power through a six-speed automatic transmission. Buyers can choose between two-wheel-drive and four-wheel-drive versions; in 2010, the base 4WD system features a single-speed transfer case, with the more traditional two-speed case (with low-range gearing) being an option.
Gmc yucon 2011-Differential, heavy duty locking rear.
Transfer case, active, single-speed, electronic Autotrac with rotary controls. Does not include neutral. Cannot be dinghy towed. Transfer case, active, 2-speed electronic Autotrac with rotary controls, with push-button controls, includes neutral position for dinghy towing. (4WD models only) Transmission, 6-speed automatic , electronically controlled with overdrive, tow/haul mode and tap up/tap down shifting.
The GMC Acadia is a full-size crossover SUV from GM. The GMC Acadia, Chevrolet Traverse, Buick Enclave and Saturn Outlook share the new GM Lambda platform. The Acadia went on sale in the United States in December 2006, and in Canada in January, 2007. The Acadia replaces 3 of the 7/8-passenger vehicles on the Pontiac-Buick-GMC dealership network, the mid-size GMC Safari van, the long-wheelbase GMC Envoy XL/XUV, and the Pontiac Montana SV6 minivan for the USA Only. As of 2009, the Lambda vehicles have replaced the Buick Rainier, Buick Rendezvous and the Buick Terraza, and then subsequently the GMC Envoy and the Chevrolet TrailBlazer. A Denali version of the Acadia will debut in 2010 as a 2011 model.
The Acadia augments GMC with an entry level truck-like SUV and is the first unibody vehicle from the marque. It is also GMC's first front-wheel drive passenger vehicle and GMC's first crossover SUV. The Acadia features seating for eight, generous interior space, and either front or all-wheel drive. With a 4,500 lb (2,042 kg) towing capacity, the Acadia slots between the Envoy and the Yukon. The Acadia is the mid-priced Lambda model between the Outlook (and its successor, the Chevrolet Traverse) and Enclave. The Acadia and Outlook had average durability ratings in Consumer Reports' surveys.
The Denali version of the Acadia arrived at dealerships as a 2011 model in the third quarter of 2010. This upgraded trim is available in FWD and AWD versions in seven- or eight-passenger form and features monotone paint, honeycomb grille, unique front and rear fascias, along with HID headlamps, chrome accents, exhaust tips and six-spoke 20-inch wheels.
The Acadia Denali joins its SUV siblings The Yukon Denali and Yukon XL Denali, and in turn marks GMC's first crossover to take the Denali badge.
The GMC Terrain is a mid-size crossover SUV that replaced the Pontiac Torrent, sold in the same dealerships prior to GM dropping the Pontiac brand,. Like the Torrent, the Terrain is based on the Theta platform. The Terrain slots below the Acadia as GMC's smallest SUV.
The Terrain shares engineering with the 2010 Chevrolet Equinox. The 2010 Terrain debuted at the 2009 New York International Auto Show. Like the preceding Pontiac Torrent, the Terrain will be sold in Mexico.
General Motors also uses the GMC Terrain marque as a rebadged Opel Antara in the Middle East that shares the same Theta platform. This vehicle is similar to the Saturn Vue and Chevrolet Captiva.
Eaton Auto Locking Rear Differential
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