GMC SIERRA C15
Built: 1978 · Series: SIERRA
More machines from model year 1978
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
GMC Sierra – light-duty 1500-class pickup for everyday commercial use: six- and eight-cylinder engines from 97 to 216.9 kW, up to 3.5 t gross weight, double cab up to 6,130 mm long
The GMC Sierra has been GMC's standalone pickup range within General Motors since 1999, closely related in use to the Chevrolet Silverado, built at, among other plants, Fort Wayne (Indiana), Flint (Michigan) and Silao (Mexico); earlier generations already carried the Sierra name on the GMC C/K chassis from the 1980s. The base 1500 class, with roughly a tonne of payload, forms the volume model, while trim lines such as SLE, SLT, Elevation and Denali order comfort and appearance.
Read on 3 more paragraphs
The register lists 65 versions here with 97 to 216.9 kW from six- and eight-cylinder engines of 2,999 to 7,440 cm³, unladen weights of 1,640 to 3,198 kg, gross vehicle weights of 2,359 to 3,500 kg, lengths of 5,020 to 6,130 mm and widths of 1,900 to 2,430 mm.
As a double-cab with an open load bed, the Sierra 1500 in North America serves both as a company vehicle for trades and services and as a private everyday vehicle; its main rivals are the Ford F-150, Ram 1500 and Toyota Tundra, against which GMC differentiates itself chiefly through equipment and the Denali luxury line.
When buying used, check frame corrosion at the rear leaf-spring mounts and around the load bed, cylinder deactivation condition and oil consumption on the petrol V8s, the transfer case and axle differentials on four-wheel-drive versions, and wear on the tow hitch on commercially used vehicles; parts are widely available through the GMC and GM parts network.
Sources: SpecCodex register, model data: GMC Sierra (Transporter), GMC
Technical data
Engine
| Cylinders | 8correct |
|---|---|
| Displacement | 5,735 cm³correct |
Dimensions and weights
| Width | 2,040 mmcorrect |
|---|---|
| Wheelbase | 3,350 mmcorrect |
| Unladen weight | 1,930 kgcorrect |
| Gross vehicle weight | 2,744 kgcorrect |
Drivetrain and chassis
| Wheels | 4correct |
|---|
Frequently asked questions
How much does the GMC SIERRA C15 weigh?
The unladen weight is 1,930 kg.
What is the gross vehicle weight of the GMC SIERRA C15?
2,744 kg.
What engine does the GMC SIERRA C15 have?
8 cylinders, 5,735 cm³ displacement.
When was the GMC SIERRA C15 built?
Production years: 1978.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 9 individual figures for this model. They come from 2 recorded sources; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
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Other models in this series
SIERRA 15
SIERRA 1500
SIERRA 1500 4X4
SIERRA 1500 CLASSIC PICK UP-DC14C
SIERRA 1500 DENALI
SIERRA 1500 DENALLI
SIERRA 1500 FLEETSIDE
SIERRA 1500 GLX
SIERRA 1500 PICK UP
SIERRA 1500 PICK UP D
SIERRA 1500 PICKUP DC14C/3340
SIERRA 1500 SLE
Sources: RDW — Dutch national vehicle register (retrieved August 2026) · How we check the data
Van in 3D section
Turn the model, look inside and click an assembly — each one is explained.
