The Classic Chevrolet Silverado: Square-Body to OBS
For the classic era, Silverado was not a model at all, it was the loaded top trim of Chevrolet's C/K pickup, the one with the woodgrain dash, the full gauges, and the brightwork. The name only became a standalone model in 1999. The trucks collectors chase under the Silverado banner are the square-body and the OBS, two of the most popular classic pickups in the market.
Chevrolet Silverado: Generation by Generation
1975–1987
Square-Body (Rounded Line)
"The boxy truck everyone wants"
The Silverado trim arrived in 1975 as the dressiest package on the C/K, above Scottsdale and Cheyenne. The square-body ran an unusually long time and is now one of the most sought-after classic trucks, prized for clean lines, a deep parts supply, and the woodgrain-and-gauges interior. The 350 small-block is the heart of these trucks, with the 454 for heavy hauling and a 6.2 diesel from 1982.
Key Changes
- → Silverado introduced as the top C/K trim (1975)
- → Woodgrain dash, full gauges, brightwork
- → 350 and 454 V8s, 6.2 diesel from 1982
- → Huge aftermarket and parts support
Specs
| Engines | 350 / 454 V8, 6.2 diesel |
| Body | Stepside, Fleetside |
| Most wanted | Short-bed Fleetside |
Chevrolet Silverado for Sale: 1975–1987
United States
1985 Chevrolet Silverado
$17,495
United States
1985 Chevrolet Silverado
$43,995
1988–1998
GMT400 (OBS)
"The Old Body Style, now a modern classic"
The GMT400 trucks, nicknamed OBS, brought a more aerodynamic shape and a far more comfortable cab. They added the extended cab in 1988 and later fuel injection. They drive like a much newer truck than the square-body, which makes them the value entry into a classic Silverado and a daily-drivable one at that.
Key Changes
- → New GMT400 aerodynamic body (1988)
- → Extended cab introduced
- → 5.7 TBI V8, 454, 6.5 diesel
- → More comfortable, modern-driving cab
Specs
| Engines | 5.7 TBI, 454, 6.5 diesel |
| Cabs | Regular, extended |
| Nickname | OBS |
Chevrolet Silverado for Sale: 1988–1998
United States
1992 Chevrolet Silverado
$11,495
United States
1994 Chevrolet Silverado
$6,995
Legacy & Impact
Square-body fever is real, and the Silverado trim is the one everyone wants. Buy a solid, rust-free truck with its woodgrain and brightwork intact and you have bought the right one. The OBS trucks are the value play and the easiest to drive every day. Either way, a short-bed Fleetside is the body to hold out for.
Frequently Asked Questions
Silverado was a trim level on the Chevrolet C/K from 1975 onward. It only became a standalone model name in 1999, after the classic trucks collectors chase today.
OBS stands for Old Body Style, the enthusiast nickname for the 1988-1998 GMT400 C/K trucks. They drive more like a modern vehicle than the square-body that came before.
A clean square-body (1975-1987) short-bed Fleetside with the Silverado trim is the blue-chip pick, followed by well-kept OBS trucks.
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Read our Chevrolet Silverado Buyer's Guide: pre-purchase checklist, common issues, and pricing.
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