Product Description
Interstate-McBee M-3900299 Valve Spring Retainer — 89–98 5.9L Cummins (Aftermarket Replacement)
Quality aftermarket valve spring retainer for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Built to OE form, fit, and function for reliable valvetrain service. Sold individually.
- Direct replacement: Installs in the factory location for OE-equivalent performance.
- Correct fitment: Matches Cummins reference 3900299 for B-series applications.
- Service friendly: Pair with new keepers and springs for a complete refresh.
- Value: Interstate-McBee quality at a competitive price.
What’s Included
- (1) Valve spring retainer, P/N M-3900299
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
- Model Years: 1989–1998
- Additional B-Series applications (4B/6B) where Cummins 3900299 is specified (confirm by ESN).
Recommended/Related Parts
- Interstate-McBee M-3900250 Valve Keeper (Locks)
- Interstate-McBee M-3802355 Intake Valve Kit
- Interstate-McBee M-3802356 Exhaust Valve Kit
- Interstate-McBee M-3284377 Push Rod
- Interstate-McBee M-3283335 Head Gasket (12-Valve)
Install Notes
- Use a proper valve spring compressor; wear eye protection.
- Inspect valve locks/keepers and verify installed height and retainer seating.
- Service one valve at a time and follow the Cummins service manual.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary B-series valvetrain parts
FAQ
Will this retainer fit my 1989–1998 5.9L Cummins?
Yes—this listing covers the 12-valve 5.9L Cummins used in 1989–1998 Dodge Ram 2500/3500. For edge cases, verify by ESN.
How many do I need?
The 12-valve 5.9L uses 12 retainers (one per valve). Retainers are sold individually.
Are the keepers included?
No. Order keepers separately (see the M-3900250 link above).
Does this fit 24-valve (1998.5–2002) engines?
No. This part is for 12-valve engines only.
Specifications for Interstate-McBee M-3900299
| Brand | Interstate-McBee |
| Part Number | M-3900299 |
| UPC | Not specified by manufacturer/seller |
| GTIN | Not specified by manufacturer/seller |
| Shipping Info | Individual small component (valve spring retainer). Exact package weight and dimensions: Not specified. |
| Cross Reference | Cummins OEM reference: 3900299 valve spring retainer for 5.9L 6BT (1989–1998) applications. Other equivalent numbers may apply; always verify by VIN/engine serial number. |
| E-Codes | Not specified |
| Prop 65 | WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: https://www.P65Warnings.ca.gov |
