Chevrolet K5 Blazer

See also Chevrolet Blazer (disambiguation)

Chevrolet K5 Blazer
Overview
Manufacturer	General Motors
Model years	1969–1994
Body and chassis
Class	Full-size SUV
Body style	2-door SUV
Layout	Front engine, rear-wheel drive (1970-1982) / four-wheel drive
Chronology
Successor	Chevrolet Tahoe/GMC Yukon

The Chevrolet K5 Blazer is a full-size sport-utility vehicle that was built by General Motors. GM's smallest full-size SUV, it is part of the Chevrolet C/K truck family. Introduced to the Chevrolet line for the 1969 model year, the K5 Blazer was replaced for 1995 by the Chevrolet Tahoe. The third generation was simply called "Chevrolet Blazer", without the K5 name. In 1970, GMC introduced its own model of the truck, called the Jimmy, which was discontinued in 1991 and replaced by the Yukon. The "Jimmy" name was chosen to reflect how GM may sound in a similar manner to how Jeep was thought to be a pronunciation of GP in the competing market.^{[citation needed]} Both were short-wheelbase trucks and available with either rear- or four-wheel drive.

The K5 Blazer and Jimmy had "full convertible" removable tops until 1975. For 1976, GM introduced a half-cab design that was less prone to leaks and slightly safer in a roll-over. These half cabs had the convertible top begin a few inches behind the driver/passenger doors and run back to the tailgate.

The Blazer's long-wheelbase relative, with an integrated rear body and doors for second row passengers, is called the Chevrolet Suburban.

1969–1972[]

First generation
Overview
Also called	GMC Jimmy
Model years	1969–1972
Powertrain
Engine	250 cu in (4.1 L) I6 292 cu in (4.8 L) I6 307 cu in (5.0 L) V8 350 cu in (5.7 L) V8
Transmission	3-speed TH-350 automatic 3-speed manual 4-speed manual
Dimensions
Wheelbase	104 in (2,642 mm) [1]
Length	177.5 in (4,508 mm) [1] 180"(1971)[2]
Width	79 in (2,007 mm) [1]

1970 GMC Jimmy

The original K5 was a short wheelbase truck. It was available in 1969 model year as four-wheel drive only. For 1970, a two-wheel drive model was added, and the truck was also offered as the GMC Jimmy. For the Blazer, there were four choices for power plants: the 250 straight-6, the 292 straight-6, the 307 V8, and the 350 V8.

The Blazer was designed and marketed to compete with International Harvester Scout and the Ford Bronco. Both of these were originally aimed at the short Jeep CJ series, which were much smaller than other trucks. The innovation of the Blazer was to simply offer a shortened pickup truck, which both increased interior space, and lowered the cost of production with a shared platform. The Blazer quickly became popular. For the first time, it married the off-road capabilities of the Scout with the "luxury" features like air conditioning and automatic transmissions routinely available on pickup trucks. By 1970, the Blazer was already outselling both of its older rivals. Ford, Dodge, and even Jeep would counter with similar shortened pickups, with the Dodge Ramcharger and Jeep Cherokee. It also came as a convertible.^[3]

The two-wheel drive version came with independent front suspension and rear trailing arms, both with coil springs. The four-wheel drive version had a solid front axle and used leaf springs front and rear. Both versions used drum brakes at all four corners until 1971, when the entire GM light truck line got standard front discs. A tachometer was optional.^[4]

There was also a choice between a three-speed automatic transmission Turbo Hydromatic (TH350), a three-speed manual transmission, and a four-speed Synchromesh (SM465) manual transmission, often referred to as the "granny gear" due to its 6.55:1 low first gear. Two transfer cases were offered: the Dana 20, available only with the manual transmissions, or the NP-205, available with both types of transmissions. The Blazer had 8 inches (200 mm) of ground clearance and an approach angle of 35°.^[1]

In October 2019, a customized version of the first generation K5 Blazer was made using the entire body of a 2018 Chevrolet Tahoe was circulated throughout the social media world ahead of a scheduled display at the 2019 SEMA Show, and in honor of Blazer’s 50th anniversary.^[5]

Engines:

• 250 in³ (4.1 L) I6 (1969–1984)
• 292 in³ (4.8 L) I6 (1970–1971)
• 307 in³ (5.0 L) V8 (1969–1973)
• 350 in³ (5.7 L) V8 (1969–1991)

Transfer cases:

• NP-205 - gear driven part-time four wheel drive
• Dana 20 - gear driven part-time four-wheel drive

Production Totals:^{[citation needed]}

1973–1991[]

Second generation
1985–1988 Chevrolet K5 Blazer
Overview
Also called	GMC Jimmy
Model years	1973–1991
Powertrain
Engine	250 cu in (4.1 L) I6 292 cu in (4.8 L) I6 305 cu in (5.0 L) V8 307 cu in (5.0 L) V8 350 cu in (5.7 L) V8 400 cu in (6.6 L) V8 6.2 L Detroit Diesel V8
Transmission	4-speed SM465 manual 3-speed TH-350 automatic 3-speed TH-400 automatic 4-speed 700-R4 automatic
Dimensions
Wheelbase	106.5 in (2,705 mm)
Length	184.8 in (4,694 mm)[6]
Width	79.6 in (2,022 mm)
Height	77.8 in (1,976 mm)

1989–1991 K5 Blazer (Scottsdale trim)

1981–1982 K5 Blazer

Military M1009 CUCV K5 Blazer

1985–1988 K5 Blazer equipped for snow plowing

1990 Blazer 1500 Silverado 6.2 Diesel

For 1973, GM's line of full-size trucks was redesigned and updated. A tilt-steering wheel became optional.^[7] Although rear-wheel drive Blazers were manufactured until 1982, the majority sold were four-wheel drive.

Until 1975, the K5 had a removable convertible top. In 1976, a half-cab design was introduced and used until 1991.^[8][9]

Although the GMT400 platform was introduced in the spring of 1987 as a 1988 model, the K5 Blazer, Suburban, and crew-cab trucks retained the earlier platform until 1991. For in late 1988 for 1989 models, the front grille was changed to resemble the squared-off ones used on the GMT400 series of pickups.

The K5 Blazer was fitted with a 250 cu in (4.1 L) inline-six as standard through 1984. Available engines included a 292 cu in (4.8 L) inline-six, small-block V8s of 305, 307, 350, or 400 cubic inches (5.0, 5.0, 5.7, and 6.6 liters), and a 6.2 L Detroit Diesel V8.

1973–1980 Blazers used the gear-driven part-time NP-205 transfer case (mostly mated to the SM465 manual transmission and some TH350s) or the chain-driven full-time NP-203 transfer case (mated to the TH350 automatic) and DANA-44 front/12-bolt rear axle combination through 1980. Starting in 1981 used the chain-driven NP208 transfer case (NP241 after 1988) with front 10-bolt/rear 10-bolt axle combinations until 1991. There is an overlap of 12-bolt rears into the early '80s, while the 10-bolt front axle was phased into production in the late 1970s.

The second generation K5 models incorporated the rear hatch glass and tailgate into a single unit, which allowed the glass panel to retract inside of the tailgate by use of a manual crank mounted on the tailgate or an electric motor activated by a key-operated switch on the tailgate and a dash-mounted switch. The weight of the large glass panel was rumored to be a liability as the manual crank gears wore prematurely and the electric motor was prone to frequent overheating and subsequent failure. This also included the electric motor drive cable which goes to the window regulator to the motor (similar in design to a speedometer cable), which usually would fail under heavy abuse. Another feature of the K5 Blazer tailgate was the safety switch connected to the electric motor which prevented the rear window from being raised if the tailgate was unlatched.

Since 1981 (in the wake of the 1973 Arab Oil Embargo and the 1979 energy crisis), Chevrolet and GMC used the smaller displacement 305s with a 9.2:1 compression ratio. These engines produced nearly as much torque as the 350, giving a similar driving feel. However, these power plants were underpowered and prone to detonation (engine knocking), especially with the electronic spark control module. To achieve the 9.2:1 compression ratio, the cylinder head chambers were smaller, measuring 56 cc instead of 76 cc.

Around 1976, a prototype K5 Blazer ^[10] was used as a testbed for a military CUCV vehicle built by Vic Hickey, father of the HUMVEE. Between 1983 and 1987, what is known as the M1009 CUCV was the production militarized version of the civilian K5. The differences are the lack of an air conditioner, an additional leaf spring in the suspension, a hybrid 12/24 V electrical system (described in detail below), blackout headlights, front mounted brush guard, a rifle rack, and special paint jobs. A majority of them are painted olive drab green or in the woodland camouflage pattern, though some vehicles that saw desert use were painted tan. All M1009s, including its derivatives, are powered with the 6.2 L Diesel power plant.

The M1009s have a split 24/12 V electrical system. Most of the truck actually runs on 12 V. It has two separate 12 V alternators and batteries wired in series, only the glow plug system, injection pump, the starter, and the jumper cable jack are wired to the 24 V terminals. everything else in the truck runs on 12 V. The glow plugs are actually 12 V glow plugs with a resistor pack on the firewall to drop the 24 V down to 12 V. This resistor pack can be bypassed and the glow plugs run directly off of the 12 V battery. If this is done and the 24 V starter is replaced with a standard 12v starter, the second alternator is no longer needed. (If this is done then the military 24 V slave adapter in the grille will need to be disconnected as well.)

Some decommissioned M1009s end up in law enforcement use (e.g. with the Los Angeles County Sheriff's Department) or sold through government auctions, but a handful are still in use by the National Guard.

After 1987, when throttle-body injection was introduced in the truck engines, the 350 was made the standard power plant.

GM temporarily changed the usual "C/K" designation to "R" and "V" for the 1987 through 1991 model years. This was done to avoid confusion with the GMT400-based Chevrolet C/K pickup trucks, which were introduced in 1988, during the overlap period.

In 1988, four new colors were introduced: Bright Blue Metallic, Forest Green Metallic, Light Mesa Brown Metallic, and Dark Mesa Brown Metallic. More new features for 1988 included a fixed mast antenna in place of the old windshield antenna, a trip odometer as part of the gauge package cluster, and an improved pulse windshield wiper control. Also, helping to reduce air leaks in the doors was a new door handle seal.

The 1989 Blazer had new base and up-level grilles, as well as new headlight bezels, body side moldings, and front bumper rub strips. Corporate 10-bolt axles were upgraded to 30 spline axle shafts from previous 28 spline. New for 1989 was the introduction of an all-new base coat/clear coat paint. The standard L05 5.7-liter V-8 now had one serpentine accessory drive belt in place of the older multi-belt accessory drive setup. 1989 was first year for the 241 transfer case and also the only year for speedometer cable driven version of the 241.

A 1990-1991 V5 Jimmy (From 1987 to 1991, "K5" was replaced by "V5")

For the 1990 model year, all Blazers now had a standard rear wheel anti-lock braking system. A new electronic speedometer system, with a 6 digit odometer on the dashboard was also introduced for 1990, along with non-asbestos brake linings. A new brake warning light on the dashboard was also introduced for 1990. The Blazer body also used double sided, galvanized exterior sheet metal. A new option for 1990 was power mirrors. The 5.7 liter V8 (L05) engine was improved for 1990 with the addition of improved oil control rings, a redesigned rear crankshaft seal, a new camshaft sprocket design, non-asbestos intake manifold gaskets, and heavy-duty intake valves. 3 point shoulder harness also become standard for rear passengers. The rear seat arm rest were eliminated from rear seat to make room for shoulder belts and pads were added to the wheel housings.

For 1991, the 700R4 was renamed to the 4L60. The TBI (throttle body injection) system used on the Blazer's standard 5.7 liter V8 had longer throttle shaft bearings, new throttle return springs, and improved fuel mixture distribution. The 5.7 liter V8 also had new heavy-duty intake valves and powdered metal camshaft sprockets. Standard on all engines was a lighter more powerful 100-amp CS130 alternator. Two new exterior colors, Brilliant Blue and Slate Metallic were offered.

Engines:

(All power and torque figures are pulled from GM factory service manual)^{[full citation needed]}

Transfer Cases:

• Dana 20 - gear driven part-time four wheel drive (1973)
• NP-203 - chain driven full-time four wheel drive (1973–1979)
• NP-205 - gear driven part-time four wheel drive (1973–1980)
• NP-208 - chain driven part-time four wheel drive (1981–1988)
• NP-241 - chain driven part-time four wheel drive (1989–1991)
  • (NP-208 & NP-241 are "shift-on-the-fly")

Axles:

• Dana 44 - Front axle (1973–1977/78)
• GM Corporate 10 Bolt - Front axle (1977/78–1991)
• GM Corporate 12 Bolt - Rear axle (1973–1981)
• GM Corporate 10 Bolt - Rear axle (1982–1991)

Production Totals:^{[citation needed]}

1992–1994[]

Third generation
1992-1993 K1500 Blazer
Overview
Also called	GMC Yukon
Production	1991–1994
Model years	1992–1994
Assembly	Janesville Assembly Plant, Janesville, Wisconsin
Body and chassis
Platform	GMT415
Powertrain
Engine	350 cu in (5.7 L) L05 V8 379 cu in (6.2 L) Detroit Diesel V8
Transmission	4-speed 4L60 automatic 5-speed manual
Dimensions
Wheelbase	111.5 in (2,832 mm)
Length	188 in (4,775 mm)
Width	77 in (1,956 mm)
Height	72 in (1,829 mm)
Curb weight	4,500 lb (2,000 kg)
Chronology
Successor	Chevrolet Tahoe

In 1991, for the 1992 models, GM redesigned its large SUVs, moving to the GMT400 architecture that had debuted for GM's 1988 pickup lines. The Chevrolet was now simply called Blazer, dropping the 'K5' prefix. The GMC Jimmy was renamed, and straightaway launched as the first generation GMC Yukon, (while rebadging their S15 Jimmy as just the 'Jimmy' from then on).

The standard engine remained the 350 cu in (5.7 L) small-block V8 with throttle-body fuel injection. A 6.5 L turbocharged Detroit Diesel V8 was added as an option for 1994, with output of 180 horsepower (134 kW) and 360 pound-feet (488 N⋅m) of torque. It was available only with a four-speed automatic transmission.^[11]

In 1995, the full-size Blazer was discontinued – renamed and relaunched as the new 1995 Chevrolet Tahoe, and simultaneously introducing a longer wheelbase, four-door wagon body style. From then on, the Tahoe and Yukon models were offered in two sizes, as two- and four-doors. At the same time, Chevrolet rebranded their 2nd generation successor to the S-10, and simply introduced it as Chevy's 'all-new Blazer' (and GMC Jimmy; 1995–2005).

References[]

External links[]

Wikimedia Commons has media related to Chevrolet K5 Blazer.

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