Factory build sheet
2021 Ram 1500 Longhorn
Build 1C6SRFSM-M · 3L 6cyl · Four-wheel drive · Pickup
VIN positions 1 through 8 read 1C6SRFSM and position 10 reads M. Those nine characters define this build. Position 9 and positions 11 through 17 differ on every car.
Every 1500 whose VIN starts 1C6SRFSM and carries M in position 10 left the plant with the same engine, transmission, drivetrain and equipment listed below. We know of 27 of them.
- Decoded Jul 7, 2026
- 27 known VINs
- 1 listed for sale now
This configuration is identical to 2021 Ram 1500 Longhorn 3L 6cyl Pickup (893 vehicles). That page carries the full record.
Factory specification
As filed by Ram 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
- 3 L
- Cylinders
- 6
- Configuration
- V-Shaped
- Engine model
- 30l v6 24v ddi dohc turbo diesel
- Engine manufacturer
- FCA
- Turbocharged
- Yes
- Horsepower
- 260 hp
- Fuel type
- Diesel
Drivetrain
- Drive type
- Four-wheel drive
- Brake system
- Hydraulic
Body & chassis
- Body class
- Pickup
- NHTSA body type
- TRUCK
- Cab type
- Crew/Super Crew/Crew Max
- Bed type
- Long
- Series
- DT
- Manufacturer
- FCA US LLC
Weight rating
- GVWR class
- Class 2F
- GVWR
- 7,001–8,000 lb
Gross vehicle weight rating is the loaded ceiling set by the manufacturer, not the car's own weight.
The same build, other model years
Ram used the VIN pattern 1C6SRFSM for 2 model years. Nothing but the year changes between these pages, so the price gap between them is depreciation on an identical car.
- 2020 Longhorn 3L 6cyl Pickup · 31 vehicles code L
-
2021 You are here code M
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 | 1C6 | FCA US LLC · World manufacturer identifier |
| 4–8 | SRFSM | 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 |
NHTSA safety ratings
Crash-test results are published per model year and body style, so they cover the 2021 Ram 1500 as a whole rather than this build alone.
Overall
★★★★★ 5 / 5
Frontal crash
★★★★ ★ 4 / 5
Side crash
★★★★★ 5 / 5
Rollover
★★★★ ★ 4 / 5
15 recall campaigns are recorded for the 2021 1500. Recalls are issued per VIN range — check the VIN of the car you are looking at, not the model.
27 vehicles carry this build
Every VIN we have decoded to 1C6SRFSM-M shares the specification above.
- 27 Known VINs
- 1 Listed for sale now
- 1C6SRFSM 7MN657508
- 1C6SRFSM 7MN584138
- 1C6SRFSM XMN529957
- 1C6SRFSM 6MN658021
- 1C6SRFSM 2MN608295
- 1C6SRFSM 0MN653834
- 1C6SRFSM 3MN624781
- 1C6SRFSM 5MN592383
- 1C6SRFSM 4MN657014
- 1C6SRFSM 4MN811480
- 1C6SRFSM 0MN568623
- 1C6SRFSM 8MN658277
- 1C6SRFSM 6MN500794
- 1C6SRFSM 9MN688694
- 1C6SRFSM 1MN541799
- 1C6SRFSM 8MN766608
- 1C6SRFSM 6MN604069
- 1C6SRFSM 3MN542159
- 1C6SRFSM 1MN746393
- 1C6SRFSM 1MN500136
- 1C6SRFSM 5MN766386
- 1C6SRFSM 5MN672928
- 1C6SRFSM 5MN706592
- 1C6SRFSM 6MN565676
- 1C6SRFSM 0MN689314
- 1C6SRFSM 0MN756445
- 1C6SRFSM 4MN628273
Neighboring configurations
Other factory configurations of the 1500, 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 27 VINs of this build we have seen in dealer inventory. They are a sample of the road population, not a production figure.