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CHEVROLET FULL SIZE BLAZER

The K5 Blazer was a full-size SUV version of the C/K pickup truck family. Introduced to the Chevrolet line in 1969, the full-size Blazer was replaced in 1995 by the Chevrolet Tahoe. In 1970, GMC introduced its own model of the truck, called the Jimmy, which lasted until 1992's GMC Yukon. Both were based on the short wheelbase pickups and were available with either 2- or 4 wheel drive. Its long wheelbase relative (with an integrated rear body) is known as the Chevrolet Suburban.

The K5 Blazer and Jimmy had removable tops for the first few years until 1976 when a half-cab bodystyle was introduced. Smaller models, the S-10 Blazer and S-15 Jimmy, were introduced alongside these trucks in 1983. The original Blazer and Jimmy remained in production until 1991; 1992 saw the introduction of a new K1500 Blazer (and rebadged GMC Yukon) on the GMT400 platform. After 1994, the Blazer was renamed the Chevrolet Tahoe.

1969

The original K5 was a very capable short wheel base truck. It came in both two wheel drive and four wheel drive models. There were four choices for power plants: the 250 straight-6, the 292 straight-6, the 307 V8, and the 350 V8.

There was also a choice between a three speed automatic transmission, a three speed manual transmission and a four speed manual transmission. Two transfer cases were offered: the Dana 20, available only with the manual transmission, or the NP-205, available with either transmission.

Engines:

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

Transfer cases:

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

1973

In 1973, GM's line of full size trucks were redesigned and updated.
Although two wheel drive Blazers were manufactured until 1982, the majority sold were four wheel drive.
Until 1976, the K5 was fully convertible. After this, a half-cab design was used until 1991.

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

The K5 Blazer is a very popular in the off-roading scene. It is a strong truck with the 350 V8 (which was the optional powerplant), the gear driven NP-205 and ten and twelve bolt axles. It is very easy to upgrade this engine, because there are many companies with performance parts available. Later models produced after 1980 used the chain-driven NP208 transfer case, and the NP241 after 1988.

Since 1981 (in the wake of the 1973 Arab Oil Embargo and 1979 energy crisis), Chevrolet (and GMC) have been using 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 powerplants were underpowered (a 5000+ GVW vehicle with a small displacement powerplant is the equivalent of a Chevette) and susceptible to detonation, especially with the electronic spark control module. To achieve the 9.2:1 compression ratio, the cylinder head chambers were smaller, measuring 54 cc instead of 60 cc. Some Blazer owners swapped out the 305s in favor of 350s, since the smaller displacement powerplant was used in all Chevrolet/GMC pickups and passenger cars.

After 1986, when throttle-body fuel injection was introduced in the truck powerplants, the 350 was made the standard powerplant.

There are also a variety of suspension and body lifts available for the K5 Blazer. It is easy to clear 33 inch (838 mm) tires stock or with a two inch (51 mm) lift or 35 inch (889 mm) tires with a four or six inch (102 or 152 mm) lift.

Engines:

4.1 L (250 in³) 250 I6 (1973-1984)
4.3 L (262 in³) 262 I6 (1985-1986)
5.0 L (305 in³) 305 V8 (1976-1987)
5.0 L (307 in³) 307 V8 (1973)
5.7 L (350 in³) 350 V8 (1973-1991)
6.6 L (400 in³) 400 V8 (1975-1980)
6.2 L (379 in³) diesel V8 (1982-1991)

Transfer cases:

Dana 20 - gear driven part-time four wheel drive (1973)
NP-205 - gear driven part-time four wheel drive (1973-1980)
NP-203 - chain driven full-time four wheel drive (1973-1979)
NP-208 - chain driven part-time four wheel drive (1981-1988)
NP-241 - chain driven part-time four wheel drive (1988-1991)

1992

The full-size Blazer was updated in 1992 on the new GMT400 platform. The Jimmy name was removed from the full-size truck in favor of Yukon, but the Blazer name lasted for two more years. Since 1995, all full-size Blazers were rebadged as the Chevrolet Tahoe

Miscellaneous

Montrose Patriot Around 1981, a prototype K5 Blazer was used as a testbed for a military CUCV vehicle. Between 1983 and 1986, what is known as the M1009 CUCV was the production militarized version of the civilian K5. The only differences are the lack of an air conditioner and an additional leaf spring in the suspension. A majority of them are painted olive drab green (or in the black-brown-green camouflage pattern used by NATO forces if an M1009 was stationed in Western Europe) until its use in Operation Desert Storm where M1009s were painted desert tan. All M1009s, including its derivatives, were powered with the 6.2 L Diesel powerplant.