Product Description
Cummins 3925377 — Genuine Outer Throttle Return Spring
MPN: 3925377 | Also Known As: accelerator return spring (outer), throttle spring | Ends: metal hook (one end) + plastic clip (other end)
Bring back crisp pedal return on your 2nd Gen. The genuine Cummins 3925377 outer throttle return spring is the OE piece for the 1994–1998 Ram 2500/3500 5.9L 12-valve (P7100). Built to the correct rate and length with the factory hook/clip ends for a clean, secure install at the throttle bellcrank.
Features & Benefits
- OE spring rate & length to restore positive pedal return and steady idle.
- Correct hardware ends — metal hook + plastic clip for proper attachment points.
- Durable spring steel resists sagging and corrosion.
- Direct-fit for P7100 mechanical throttle linkage (no universal hooks or hacks).
- Genuine Cummins part for reliable, repeatable performance.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1994–1998 | 5.9L 12V (P7100) | Ram 2500/3500 |
Industrial/Off-Highway: Cataloged by Cummins as a tension spring on B-Series platforms—verify by ESN for equipment engines.
Compatibility Notes:
- Not for 1998.5–2002 24-valve (VP44) or 2003+ common-rail trucks—different throttle/APS systems.
- This is the outer spring; pair with the inner spring 3933130 for best results.
Specifications
- Type: Accelerator / throttle return spring (outer)
- OE Part Number: 3925377
- Ends: One metal hook, one OE plastic clip
- Material: Spring steel
- Quantity Required: 1 per vehicle (outer spring)
Often Paired With
- Inner throttle return spring: Cummins 3933130 (’94–’98, with plastic clips on both ends)
- Throttle linkage rod / ends: Cummins 3932317 (as needed)
- Throttle/bellcrank bushings to remove play and improve feel
What’s In The Box
- (1) Genuine Cummins Outer Throttle Return Spring (3925377) — hook/clip ends
Installation Tips
- Match original routing and end locations; inspect bellcrank/linkage for wear.
- Replace the inner spring 3933130 at the same time to restore OE return force.
- After install, verify smooth pedal travel and reliable return to idle.
FAQ
WILL THIS FIT MY 1994–1998 12-VALVE RAM?
Yes—direct OE replacement outer throttle return spring for 1994–1998 5.9L 12V (P7100) applications.
IS THIS THE INNER OR OUTER SPRING?
This listing is the outer spring (hook/clip ends). The inner spring is Cummins 3933130 (sold separately).
DOES THIS FIT 24-VALVE OR COMMON-RAIL TRUCKS?
No—those platforms use different throttle/APS systems. This spring targets the 12-valve P7100 linkage only.
HOW DO I KNOW IF MINE IS WEAK?
Symptoms include lazy pedal return, occasional high idle, or the need to blip the pedal to drop idle after revs.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins 3925377.
