Caballero debuts alongside GM's downsized intermediates on a 117-inch wheelbase shared with the El Camino. The Diablo sport appearance package is offered from launch.
Platforms / GM G-Body / GMC
1978–1987 GMC G-BODY
GMC G-Body
A compact branch of the G-body family centered on the Caballero—the GMC-badged counterpart to the El Camino—with its own trim identity and the enthusiast-favorite Diablo appearance package.
Why GMC gets its own branch: the Caballero shared core architecture with Chevrolet's El Camino, but it was sold and branded through GMC dealers with distinct emblems, trim and appearance packages. Master Customs keeps it separate so the GMC identity does not disappear inside Chevrolet coverage.
GMC MODEL GUIDE
One core model, one distinct identity.
This is intentionally a smaller branch than Chevrolet, Pontiac, Buick or Oldsmobile. The Caballero gets a complete model guide, while the Diablo receives its own enthusiast deep dive.
1978–1987
Caballero
GMC's car-based pickup, sharing the long-wheelbase G-body utility architecture with the El Camino while carrying GMC-specific branding and trim.
Open Caballero guide → SPORT APPEARANCECaballero Diablo
The sport-themed Caballero package with distinctive hood graphics and trim—an enthusiast-oriented variation present from the beginning of the Caballero era.
Open Diablo deep dive → PLATFORM RELATIVECompare El Camino
Use the Chevrolet guide for the closely related El Camino chronology, then return here for GMC-specific identity and trim.
Compare Chevrolet →CABALLERO CHRONOLOGY
1978 to 1987
The GMC story tracks the same core utility-body architecture as the El Camino, but its branding, trim and dealer channel make it worth preserving separately.
A revised front-end treatment arrives and remains the visual basis through the final years of production.
Production of the El Camino/Caballero family shifts to GM facilities in Mexico.
Final model year for the Caballero, closing GMC's car-based pickup chapter on the G-body architecture.
RESEARCH STANDARD
GMC Caballero documentation often appears within Chevrolet El Camino factory literature because the two vehicles were engineered and documented together. Master Customs uses factory literature as the baseline and calls out GMC-specific branding or trim only when it can be supported.