Factory build sheet
2021 Chevrolet Silverado Work Truck
Build 1GC4WLEY-M · 6.6L 8cyl · Pickup
VIN positions 1 through 8 read 1GC4WLEY and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every Silverado whose VIN starts 1GC4WLEY and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 26 of them.
- Decoded Jul 7, 2026
- 26 known VINs
Factory specification
As filed by Chevrolet with NHTSA for this build. Fields the filing does not record are left out entirely — a missing row means no recorded value, not a missing feature.
Engine
- Displacement
- 6.6 L
- Cylinders
- 8
- Configuration
- V-Shaped
- Engine model
- L5P - DI, DURAMAX, GEN 5, VAR. 1
- Turbocharged
- Yes
- Fuel type
- Diesel
Drivetrain
- Drive type
- 4x2
- Brake system
- Hydraulic
Body & chassis
- Body class
- Pickup
- NHTSA body type
- TRUCK
- Doors
- 4
- Cab type
- Crew/Super Crew/Crew Max
- Series
- 2500
- Manufacturer
- GENERAL MOTORS LLC
Weight rating
- GVWR class
- Class 3
- GVWR
- 10,001–14,000 lb
Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.
Driver assistance, as built
- Forward collision warning Optional
- Crash imminent braking Optional
- Blind spot warning Optional
Systems the filing does not record are not listed above. Check the window sticker of the exact car before you rely on any single feature.
The same build, other model years
Chevrolet used the VIN pattern 1GC4WLEY for 5 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.
How this VIN pattern is read
A 17-character VIN carries two kinds of information: what was built, and which one it is. This page is the first kind — the nine highlighted positions.
| Positions | Characters | What they encode |
|---|---|---|
| 1–3 | 1GC | GENERAL MOTORS LLC · World manufacturer identifier |
| 4–8 | 4WLEY | Model, body style, engine and restraint system |
| 9 | × | Check digit — computed per vehicle, not part of the build |
| 10 | M | Model year — 2021 |
| 11 | × | Assembly plant |
| 12–17 | ×××××× | Production sequence number, unique to each vehicle |
26 vehicles carry this build
Every VIN we have decoded to 1GC4WLEY-M shares the specification above.
- 26 Known VINs
- 1GC4WLEY 2MF132700
- 1GC4WLEY 1MF134518
- 1GC4WLEY XMF135196
- 1GC4WLEY 2MF191701
- 1GC4WLEY 2MF190984
- 1GC4WLEY 3MF129403
- 1GC4WLEY 8MF191833
- 1GC4WLEY 4MF202522
- 1GC4WLEY 3MF147545
- 1GC4WLEY 1MF192631
- 1GC4WLEY 7MF191435
- 1GC4WLEY 3MF135086
- 1GC4WLEY 6MF135048
- 1GC4WLEY 1MF233565
- 1GC4WLEY 5MF187884
- 1GC4WLEY 7MF216477
- 1GC4WLEY 1MF135538
- 1GC4WLEY 7MF132725
- 1GC4WLEY 6MF147782
- 1GC4WLEY 6MF192477
- 1GC4WLEY 4MF123142
- 1GC4WLEY 2MF148623
- 1GC4WLEY 7MF148035
- 1GC4WLEY XMF135425
- 1GC4WLEY 4MF134822
- 1GC4WLEY 2MF159170
Neighboring configurations
Other factory configurations of the Silverado, each with its own build sheet. The set is fixed by the VIN patterns themselves, so it does not shuffle as prices or inventory move.
Keep going
Where this data comes from
Specification fields are decoded from the manufacturer's filings in the NHTSA vPIC database, keyed on VIN positions 1–8 and 10. We publish the filed values as they stand and leave out anything the filing does not record.
Vehicle counts come from the 26 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.