K5 Blazer history: the full-size Chevy Blazer, 1969–1994

Chevy K5 Blazer history

Chevrolet launched the Blazer for 1969 as a shortened C/K pickup with a half-cab body and a removable hardtop or soft top. It was four-wheel drive only in its first year; a two-wheel-drive version was added for 1970, the same year GMC began selling a twin as the Jimmy.

The 1973 redesign moved the Blazer onto the square-body C/K. Early trucks kept a fully removable top, and from 1976 the Blazer used a half-cab with a steel front roof and removable rear top through 1991. Two-wheel-drive versions were built until 1982, a 400 cu in V8 was offered on four-wheel-drive trucks from 1975 to 1979, and a 6.2L diesel V8 was available from 1982. The military M1009 CUCV, built from 1983 to 1987, was based on it.

K5 was never GM's internal name; it appeared on Chevrolet badging until 1988. The K5 prefix was dropped for the 1992 GMT400 version, which had a permanent roof and a 111.5-inch wheelbase, and that truck was renamed the Chevrolet Tahoe for 1995, freeing the Blazer name for the midsize S-Blazer.[1]

Years and production numbers

Generations and key variants

Engine and drivetrain facts

• The square-body Blazer's 6.2L Detroit Diesel V8 (1982–91) was offered on four-wheel-drive trucks only, and every M1009 military Blazer used it.
• The 400 cu in small-block V8 was offered on 1975–1979 four-wheel-drive Blazers only.
• The GMT400 Blazer used front torsion bars on four-wheel-drive versions and coil springs on two-wheel-drive versions; a 6.5L diesel V8 with automatic transmission was added for 1994.

Sources:[1]

What changed, generation by generation

1. 1969Blazer launches as a 4WD-only, shortened C/K with a removable top.
2. 1970Two-wheel-drive Blazer added; GMC sells its twin as the Jimmy.
3. 1973Second generation on the square-body C/K, still with a fully removable top.
4. 1976Half-cab design with a fixed front roof and removable rear top, used through 1991.
5. 198117-character VINs begin.
6. 19826.2L diesel V8 offered on 4WD trucks; last year for 2WD and the standard 250 six.
7. 1987–1991Renamed V-series internally (R/V) and sold alongside the new GMT400 pickups; K5 badges dropped from 1988.
8. 1992GMT400 Blazer: permanent roof, longer wheelbase, 2WD and 4WD.
9. 1995Full-size Blazer renamed Chevrolet Tahoe.

Sources:[1]

What to check before you buy one

• Check the rear quarter panels, tailgate, rocker panels and floor pans for rust, plus the body mounts on the frame.
• On removable-top trucks, look at the top seal and the area around the roll bar for water damage, and confirm the top actually fits and seals.
• Ask what has been changed: many Blazers have lift kits, engine swaps and modern drivetrains, and those changes drive value as much as the year does.
• Inspect the front axle, steering box and transfer case for leaks and wear on four-wheel-drive trucks.
• Match the title to the truck: 1981 and later Blazers have a 17-character VIN; earlier ones use GM's shorter serial number.
• For 1981 and later trucks, run the VIN through NHTSA's recall lookup (nhtsa.gov/recalls).

Chevy K5 Blazer prices and values

Hagerty reported in 2019 that every one of eight 1969–72 Blazers and Jimmys it tracked at auction sold above its price-guide value for condition, with a record $132,000 paid for an LS3-swapped 1969, and that the median #2-condition value of the Blazer had risen 164 percent since 2009.[2]

How to verify a Chevy K5 Blazer's factory options

For a 1981-or-later Blazer, the factory build record lists the ordered-option RPO codes — engine, transmission, axle ratio, trim and packages — when licensed build data exists for that VIN. Coverage for 1980s and early-1990s trucks varies, and the record covers ordered options rather than a complete parts list, so the free availability check comes first.

Standardized 17-character VINs began with the 1981 model year, so only 1981–1994 Blazers carry one; earlier trucks use GM's shorter serial format.[4],[5]

For pre-1981 cars, the body (trim) tag and engine stampings carry the original factory codes, and the GM Heritage Center publishes vehicle information kits for many past GM models.