14 Ignition parts are listed for the 2021 Ram 4000, in 4 part types, covering both the 5.7L V8 and the 6.4L V8. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Ram 4000, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. 12 parts of the 14 listed are Ignition Coil (6 parts), Spark Plug (4 parts) and Camshaft Position Sensor (2 parts). The other 1 part type covers the remaining 2 parts.
The 2021 Ram 4000 was sold with both the 5.7L V8 and the 6.4L V8. 13 parts fit every engine; the other 1 is engine-specific. Each part shows which engine(s) it fits.
7 brands supply ignition parts for the 2021 Ram 4000, led by WALKER PRODUCTS (4 parts), NGK (4 parts) and SPECTRA PREMIUM (2 parts), plus 4 more brands. Quality grades include Economy, Standard Replacement and Iridium.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Ram 4000. 2 parts have it, including STANDARD MOTOR PRODUCTS UF504T (Ignition Coil) and ASTEMO / HITACHI IGC0164 (Ignition Coil). Each part number opens a page with every vehicle that part fits.
Camshaft Position Sensor
Full Service Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: all 2021 4000 engines | 23591288 | 🇲🇽 MX | Full Service Kit | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: all 2021 4000 engines | 2351288 | 🇲🇽 MX | Sensor Only | View on Amazon |
This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
2 Camshaft Position Sensor parts for the 2021 Ram 4000 come from WALKER PRODUCTS. Every part fits both the 5.7L V8 and the 6.4L V8.
The Full Service Kit section lists 1 option from WALKER PRODUCTS — grouped under the catalog's "Full Service Kit" designation — the notes column spells out what sets them apart. WALKER PRODUCTS 23591288 is listed in this group.
In the Standard Replacement grade, WALKER PRODUCTS supplies 1 part: built to original-equipment specification. A representative part number is WALKER PRODUCTS 2351288.
This group includes WALKER PRODUCTS 23591288 and WALKER PRODUCTS 2351288.
Crankshaft Position Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Fits: all 2021 4000 engines | S10399 | 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WALKER PRODUCTS Fits: all 2021 4000 engines | 2351666 | 🇲🇽 MX | Sensor Only | View on Amazon |
This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.
2 Crankshaft Position Sensor parts for the 2021 Ram 4000 come from 2 brands — SPECTRA PREMIUM and WALKER PRODUCTS. Every part fits both the 5.7L V8 and the 6.4L V8.
The Economy section lists 1 option from SPECTRA PREMIUM — the catalog's value-priced group. SPECTRA PREMIUM S10399 is listed in this group.
Standard Replacement: 1 part, from WALKER PRODUCTS. A representative part number is WALKER PRODUCTS 2351666.
Listed part numbers: SPECTRA PREMIUM S10399 and WALKER PRODUCTS 2351666.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 2021 4000 engines | UF504T | 🇲🇽 MX | T-Series | View on Amazon |
| HOLSTEIN Fits: all 2021 4000 engines | 2IGC0173 | 🇲🇽 MX | View on Amazon | |
| SPECTRA PREMIUM Fits: all 2021 4000 engines | C693 | 🇲🇽 MX | Ignition Coil Mounts to Cylinder Head | View on Amazon |
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ASTEMO / HITACHI Popular Fits: all 2021 4000 engines | IGC0164 | 🇲🇽 MX | Coil Type: Individual | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UNITED MOTOR PRODUCTS Fits: all 2021 4000 engines | COP107 | 🇲🇽 MX | View on Amazon | |
| WALKER PRODUCTS Fits: all 2021 4000 engines | 9212093 | 🇲🇽 MX | Single Coil | View on Amazon |
This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.
6 Ignition Coil parts for the 2021 Ram 4000 come from 6 brands — STANDARD MOTOR PRODUCTS, HOLSTEIN, SPECTRA PREMIUM and 3 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS UF504T. Every part fits both the 5.7L V8 and the 6.4L V8.
The Economy section: 3 options from STANDARD MOTOR PRODUCTS, HOLSTEIN and SPECTRA PREMIUM. STANDARD MOTOR PRODUCTS UF504T is listed in this group.
In the Premium grade, ASTEMO / HITACHI supplies 1 part: a step above OE specification in materials, tolerances or warranty terms. A representative part number is ASTEMO / HITACHI IGC0164.
Standard Replacement: 2 parts, from UNITED MOTOR PRODUCTS and WALKER PRODUCTS. A representative part number is UNITED MOTOR PRODUCTS COP107.
Listed part numbers: STANDARD MOTOR PRODUCTS UF504T, HOLSTEIN 2IGC0173 and SPECTRA PREMIUM C693, plus the other parts above.
Spark Plug
Copper / Nickel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Fits: 5.7L V8 | 92174 | 🇲🇽 MX | StandardPre-Set Gap: 0.044" | View on Amazon |
Iridium (lasts up to 4x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Fits: all 2021 4000 engines | 4469 | 🇲🇽 MX | Iridium IXPre-Set Gap: 0.044" | View on Amazon |
| NGK Fits: all 2021 4000 engines | 92145 | 🇲🇽 MX | Laser IridiumPre-Set Gap: 0.044" | View on Amazon |
Platinum (lasts up to 2x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Fits: all 2021 4000 engines | 5018 | 🇲🇽 MX | G-PowerPre-Set Gap: 0.040" | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
NGK supplies the 4 Spark Plug parts for the 2021 Ram 4000. 3 parts fit every engine; the other 1 is engine-specific.
In the Copper / Nickel grade, NGK supplies 1 part: grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. A representative part number is NGK 92174.
The Iridium (lasts up to 4x longer than Copper / Nickel) section lists 2 options from NGK — grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. NGK 4469 is listed in this group.
In the Platinum (lasts up to 2x longer than Copper / Nickel) grade, NGK supplies 1 part: grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is NGK 5018.
This group includes NGK 92174, NGK 4469 and NGK 92145 and the remaining parts above.
Buying Ignition Parts for a 2021 Ram 4000
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- Match the engine first. Some ignition parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Ignition Coil and Spark Plug .
Frequently Asked Questions
How many ignition parts fit the 2021 Ram 4000?
Our catalog currently lists 14 ignition parts for the 2021 Ram 4000 across 4 subcategories and 7 brands, covering both the 5.7L V8 and the 6.4L V8. Each part is matched to the engine(s) it fits.
Do ignition parts differ between 2021 Ram 4000 engines?
Some do. 13 parts fit every engine; the other 1 is engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of ignition problems on a 2021 Ram 4000?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 2021 Ram 4000?
Notes on this page include pre-set gaps of 0.040" and 0.044". Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Ram 4000 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Ram 4000?
First match the engine — each row shows which engine(s) the part fits. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Ram 4000
Ignition Parts for Other Ram 4000 Years
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