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)

Industrial/Off-Highway: Cataloged by Cummins as a tension spring on B-Series platforms—verify by ESN for equipment engines.

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.