General Motors Gmc C20
Built: 1978 · Series: Other models
More machines from model year 1978
General Motors GMC – other models: the collective page of pick-ups, SUVs and vans outside the named ranges, from Sierra and Yukon to Vandura and Safari, four- to ten-cylinders of 2.4 to 8.0 litres
This page gathers the GMC commercial vehicles the register could not assign to a named range – General Motors' truck and pick-up brand, which grew out of the GMC Truck Company in 1912 and to this day offers its own equipment lines alongside the mechanically related Chevrolet models. The type logic follows GM's modular system: Sierra denotes the pick-up range (sister model to the Chevrolet Silverado), Yukon and the extended Yukon XL the full-size SUVs on pick-up basis, Vandura the classic box van of the 1970s to 1990s, Safari the compact van, Canyon the smaller pick-up and Acadia the crossover SUV; suffixes such as Denali mark the luxury trim. A few models in the stock also carry, because of shared platforms and import routes, the badges of other GM-related brands.
Read on 3 more paragraphs
The register lists here 41 versions from four- to ten-cylinders of 2,350 to 7,990 cm³, unladen weights from 1,337 to 3,015 kg, gross weights from 2,217 to 3,500 kg, lengths from 4,900 to 6,150 mm and widths from 1,720 to 2,530 mm.
GMC is one of the established pick-up and SUV brands in North America and positions itself there as a somewhat more upmarket alternative to the technically related Chevrolet line-up; in Europe the brand is present only through importers and the used market.
On used examples, rust on frame and load bed, the condition of the automatic transmission and four-wheel drive, brakes and suspension count, and on the V8 engines the condition of ignition and injection; parts for the younger model years run through the GMC network, for older models through the North American classic-parts market.
Sources: SpecCodex register, model data: General Motors GMC (weitere Modelle), GMC (manufacturer)
Technical data
Engine
| Cylinders | 8correct |
|---|---|
| Displacement | 5,657 cm³correct |
Dimensions and weights
| Length | 5,500 mmcorrect |
|---|---|
| Width | 1,950 mmcorrect |
| Wheelbase | 3,340 mmcorrect |
| Unladen weight | 2,075 kgcorrect |
| Gross vehicle weight | 2,906 kgcorrect |
Drivetrain and chassis
| Wheels | 4correct |
|---|---|
| Top speed | 160 km/hcorrect |
Frequently asked questions
How much does the General Motors Gmc C20 weigh?
The unladen weight is 2,075 kg.
What is the gross vehicle weight of the General Motors Gmc C20?
2,906 kg.
What engine does the General Motors Gmc C20 have?
8 cylinders, 5,657 cm³ displacement.
What are the dimensions of the General Motors Gmc C20?
5,500 mm × 1,950 mm.
When was the General Motors Gmc C20 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.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
This page carries 11 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.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
Other models in this series
100 SERIES
100 STEPSITE
1500 CUSTOM
2500 SIERRA
AC302
ACADIA
C10 1500 CUSTOM
C15
C1500
C25
CADILLAC ESCALADE EXT
CHEVROLET K30
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.
