Yukon Gear High Performance Gear Set For 09 & Down Chrysler 9.25in in a 3.90 Ratio

Yukon Gear Ring & Pinion Gear Set for Chrysler 9.25 in. Rear (2009 and Earlier) (YG C9.25-390)

The YG C9.25-390 is a Yukon Gear high performance ring & pinion gear set engineered for the Chrysler 9.25 in. Rear (2009 and Earlier). Whether you are building a dedicated trail rig, upgrading for larger tires, or replacing worn factory gearing, part number YG C9.25-390 delivers the precision, strength, and long-term reliability your drivetrain demands. Yukon Gear applies CNC-machined tooth profiles, high-grade alloy steel, and vacuum heat treating to every YG C9.25-390 gear set they produce.

Features and Benefits

• High-grade alloy steel construction for superior strength and fatigue resistance
• CNC-machined tooth profile reduces friction and heat during high-load operation
• Vacuum heat treatment improves case hardness and core toughness throughout
• Designed to OEM dimensions for precise fit in the Chrysler 9.25 in. Rear (2009 and Earlier)
• Compatible with factory and aftermarket limited-slip and locking differentials
• One-year warranty against manufacturer defects; optional Y.E.S. lifetime protection plan available
• Sold as a matched set for balanced break-in and consistent wear patterns
• Drop-in fit eliminates time-consuming custom fitting during installation

Vehicle Fitment

Specifications

What Is Included

• One (1) ring gear
• One (1) pinion gear
• Installation instructions

Frequently Asked Questions

Q: What differential does part number YG C9.25-390 fit?
A: The YG C9.25-390 is engineered specifically for the Chrysler 9.25 in. Rear (2009 and Earlier). Always verify your axle model and spline count before ordering.

Q: What gear ratio does YG C9.25-390 provide?
A: This gear set produces a 3.90 ratio, suitable for towing-oriented builds or mild tire upgrades on Dodge/Ram trucks and SUVs equipped with the 9.25 in. rear axle.

Q: Will this ring and pinion fit alongside a limited-slip or locking differential?
A: Yes. The YG C9.25-390 is compatible with standard open, limited-slip, and locking differentials in the Chrysler 9.25 in. Rear. Verify carrier compatibility before ordering.

Q: Does YG C9.25-390 come with a warranty?
A: Yukon Gear provides a one-year warranty against manufacturer defects on the YG C9.25-390. The Magnuson-Moss Warranty Act protects your right to use aftermarket parts without voiding your vehicle's factory warranty.

Q: Do I need a break-in procedure after installing YG C9.25-390?
A: Yes. All new ring and pinion sets require a proper break-in. Avoid sustained high speeds or heavy towing for the first 500 miles.

Q: What additional parts will I need when installing YG C9.25-390?
A: A complete installation typically requires a differential overhaul kit (bearings, seals, shims), fresh gear oil, and RTV sealant.

Q: Is professional installation required for YG C9.25-390?
A: Professional installation by a drivetrain specialist is recommended. Precise backlash and preload settings are critical for gear longevity.

Q: Can using aftermarket gears like YG C9.25-390 void my vehicle warranty?
A: Under the Magnuson-Moss Warranty Act, an automotive manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part. They must demonstrate the aftermarket part directly caused the failure.

Installation Instructions

1. Raise the vehicle on a level surface and support it safely with jack stands before removing the differential cover.
2. Drain the existing differential fluid completely into a catch pan.
3. Remove the differential carrier and note the original shim locations and bearing preload settings.
4. Press out the old ring gear from the carrier using an appropriate gear press and protective blocks.
5. Clean all mating surfaces on the carrier and housing thoroughly before proceeding.
6. Press the new ring gear from the YG C9.25-390 set onto the carrier, heating the ring gear to approximately 250 degrees F to ease fitment if necessary.
7. Install the pinion with the correct depth shim and set pinion preload per Yukon specifications.
8. Set carrier bearing preload and backlash to specifications in the Yukon installation guide included with YG C9.25-390.
9. Verify tooth contact pattern using gear marking compound before final assembly.
10. Reinstall the differential cover with fresh RTV or a new gasket and torque bolts to factory specification.
11. Fill with the correct differential fluid type and quantity for the Chrysler 9.25 in. Rear.
12. Perform a proper break-in drive cycle and re-inspect the fluid level after the first 50 miles.

WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.