Product Description
The Cummins 3949530 OEM T3 turbocharger to exhaust manifold gasket is the correct factory gasket between the turbo and exhaust manifold on many 2003–2007 Dodge Ram 2500/3500 5.9L Cummins trucks. Built from OE-grade multi-layer material, this gasket maintains a tight, leak-free seal under high drive pressure and exhaust gas temperatures, helping your Holset turbo spool quickly and your ISB engine deliver consistent boost.
Whether you are replacing a leaking turbo, upgrading to a fresh OEM turbo assembly, or just buttoning up a manifold swap, using a genuine Cummins 3949530 gasket avoids the fitment and sealing issues that can show up with cheap aftermarket copies. This gasket is also used across many ISB/QSB applications, so it is a smart, low-cost part to keep on the shelf any time you service a T3 flange turbocharger on a B-series Cummins.
- Genuine Cummins 3949530 T3 turbo-to-manifold gasket for 5.9L ISB applications
- Correct fit for many 2003–2007 Ram 5.9L Holset HE341/HE351 style T3 turbochargers
- OE-style multi-layer construction for excellent heat and pressure resistance
- Helps prevent boost leaks, soot streaking, and warped sealing surfaces
- Direct replacement for the factory gasket (no trimming or slotting required)
Fitment
- 2003–2007 Dodge Ram 2500/3500 with 5.9L Cummins ISB (common-rail) using an OEM-style T3 flange turbocharger (e.g. Holset HE341/HE351CW).
- Additional on-road/off-road ISB and QSB T3 applications where Cummins part number 3949530 is specified — verify by engine serial number (ESN) for non-Ram applications.
Always verify fitment by VIN or ESN before ordering when working on industrial, agricultural, or generator-spec engines.
Cross-Reference & Related Genuine Cummins Parts (CPP Diesel)
Pair this turbo gasket with other OE Cummins gaskets and sets when you are into the top end of a 5.9L:
- CUMMINS 3946275 OEM EXHAUST MANIFOLD GASKET – RAM 5.9L (1998.5–2007) – manifold-to-head gasket (6 required on 6-cylinder applications).
- CUMMINS 3969988 OEM INTAKE HEATER GRID GASKET – 5.9L CUMMINS (1989–2007) – intake heater grid gasket commonly serviced with turbo and manifold work.
- CUMMINS 3958645 OEM CYLINDER HEAD GASKET (THICK, MLS) – RAM 5.9L (2003–2007) – thick MLS head gasket for higher boost builds and resurfaced heads.
- CUMMINS 4089263 OEM UPPER ENGINE GASKET SET – ISB 5.9L (REAR GEAR) – complete upper gasket set for full top-end service on many 5.9L ISB engines.
Why Choose a Genuine Cummins 3949530 Gasket?
- Designed by Cummins specifically for T3 flange B-series applications
- Maintains sealing under repeated heat cycles and turbo removal/installation
- Helps protect expensive turbochargers and manifolds from erosion and leaks
- Backed by Cummins engineering, not a generic “fits-all” imprint
Specifications for cummins 3949530
| Attribute | Value |
|---|---|
| Brand | Cummins |
| Part Number | 3949530 |
| Description | T3 turbocharger to exhaust manifold gasket |
| Engine Platform | Cummins B / ISB / QSB (including many 5.9L ISB truck applications) |
| Primary Vehicle Fitment | 2003–2007 Ram 2500/3500 5.9L Cummins ISB with OEM-style T3 turbocharger |
| Material | OE-style high-temperature gasket material (multi-layer composite/steel) |
| UPC | Not specified by manufacturer |
| GTIN | Not specified by manufacturer |
| Cross Reference | Used with various Cummins turbo and manifold assemblies where 3949530 is called out; see related Cummins gasket part numbers above. |
| E-codes / CARB EO | Not applicable (replacement gasket – does not alter emissions output) |
| Shipping Weight | Approx. 0.04 lb (small parcel) |
| Shipping Method | Ships via standard ground service in protective packaging |
| Country of Origin | As marked on part or packaging (genuine Cummins) |
| Prop 65 Warning | WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
Frequently Asked Questions
Will this Cummins 3949530 gasket fit my 2003–2007 Ram 5.9L Cummins?
In most cases, yes – this is the OEM T3 turbo-to-manifold gasket used on many 2003–2007 Ram 2500/3500 5.9L ISB trucks with the factory-style Holset T3 turbocharger. If your build uses a non-stock turbo or manifold, confirm that it uses a standard T3 turbine inlet and that Cummins 3949530 is specified for your engine serial number (ESN).
Can I reuse my old turbocharger gasket?
Reusing a turbo gasket is not recommended. Once a turbo-to-manifold gasket has been heat cycled and crushed, it may not reseal properly and can cause boost leaks, soot tracking, or warped sealing surfaces. For any turbo removal, installing a new genuine Cummins 3949530 gasket is cheap insurance against future leaks.
Does this gasket work with aftermarket T3 turbos on a 5.9L Cummins?
If your aftermarket turbocharger uses a standard T3 turbine inlet flange and bolts to an OEM-style 5.9L Cummins exhaust manifold, this gasket will generally work. However, some performance turbos and manifolds use different flange styles or V-band connections. Always confirm flange type before ordering.
Should I replace other gaskets when I change the turbo?
It is a good idea to inspect and replace other sealing components in the system while you are there. Many technicians also replace the exhaust manifold-to-head gaskets, intake heater grid gasket, and inspect the cylinder head gasket and upper-engine gaskets during major service. See the related Cummins gasket links above for OE options that pair well with this turbo gasket.
Is this a genuine Cummins part or an aftermarket replacement?
This is a genuine Cummins 3949530 turbocharger gasket sourced through CPP Diesel, not an off-brand replacement. You get OE fit, OE materials, and Cummins engineering, which is critical in a high-heat, high-drive-pressure connection between the turbo and manifold.
