Yukon Gear High Performance Gear Set For GM 11.5in in a 3.73 Ratio

Yukon High-Performance Ring and Pinion Gear Set for GM 11.5in Rear Axle, 3.73 Ratio

The YG GM11.5-373 is a high-performance ring and pinion gear set engineered for the GM and Chrysler 11.5-inch AAM (American Axle Manufacturing) 14-bolt rear differential found in heavy-duty Silverado, Sierra, and Ram HD trucks from 2001 to 2018. This YG GM11.5-373 gear set is manufactured from 8620 triple-alloy steel using computer-controlled forging processes and precision heat treatment to deliver a quiet, strong, and long-lasting 3.73 ratio gear change. Whether you are running larger tires, adding horsepower, or restoring factory performance, the YG GM11.5-373 meets OEM-level standards at a fraction of dealer pricing.

Features and Benefits

• 8620 Triple-Alloy Steel Construction - Computer-controlled forging from premium steel delivers superior strength and fatigue resistance under high-torque loads common in 3/4 and 1-ton trucks.
• State-of-the-Art Heat Treatment - Advanced case hardening and tempering processes ensure a durable surface with a tough core for long service life.
• Precision Tooth Geometry - Yukon engineers optimize tooth profile for reduced friction, lower operating temperatures, and quieter gear mesh at highway speeds.
• 30-Spline Pinion Shaft - Direct factory-replacement spline count for GM 11.5in AAM axles, simplifying installation without additional machining.
• 12-Bolt Ring Gear - Factory bolt pattern maintained for use with standard ring gear bolts and carrier hardware.
• Broad Gear Ratio Selection - The YG GM11.5-373 is available as part of Yukon's complete 3.73 through 5.13 ratio lineup for this axle, letting you match any tire upgrade.
• One-Year Warranty - Backed against manufacturer defects, with the optional Yukon Y.E.S. Plan for lifetime, no-questions-asked coverage while you own the vehicle.

Vehicle Fitment

Specifications

What is Included

• One ring gear (11.50in, 12-bolt, 3.73 ratio)
• One pinion gear (30-spline)
• Installation and setup instructions

Frequently Asked Questions

• Q: Which differential does the YG GM11.5-373 fit?
  A: It fits the GM and Chrysler AAM 11.5-inch 14-bolt rear differential found in Chevrolet Silverado HD, GMC Sierra HD, and Ram HD trucks.
• Q: What is the pinion spline count on the YG GM11.5-373?
  A: The pinion shaft is 30-spline. Verify your carrier and pinion before ordering.
• Q: What tire sizes work well with a 3.73 gear ratio?
  A: A 3.73 ratio pairs well with stock through 35-inch tires on most heavy-duty trucks. For larger tires, consider 4.10 or 4.56 ratios.
• Q: Does this gear set require a new carrier?
  A: The YG GM11.5-373 uses a 3.73 ratio which typically fits the standard open carrier. Confirm carrier breaks for your specific axle before ordering.
• Q: Is professional installation required?
  A: Yes. Ring and pinion installation requires precise backlash and preload setup. Yukon recommends installation by an experienced drivetrain technician.
• Q: Does Yukon's warranty comply with the Magnuson-Moss Warranty Act?
  A: Yes. Yukon's written warranty terms are provided with the product, in compliance with the Magnuson-Moss Warranty Act. Using the Y.E.S. Plan does not require using specific dealers.
• Q: Is a ring gear bolt set included?
  A: Ring gear bolts are not included. Reuse factory bolts in good condition or purchase new ring gear bolts separately.
• Q: What break-in procedure should I follow?
  A: Avoid sustained high-speed or high-load driving for the first 500 miles. Change the differential fluid after 500 miles to flush metal particles from the gear break-in.

Installation Overview

1. Drain the differential fluid and remove the axle shafts and differential cover.
2. Remove the carrier assembly and note all existing shim locations and thicknesses.
3. Press off old bearings from the carrier and pinion, noting the original shim stack.
4. Install the new ring gear from the YG GM11.5-373 set onto the carrier using factory torque specifications and thread-locking compound.
5. Install new pinion bearings and set pinion depth using a depth gauge or marking compound.
6. Assemble with a new crush sleeve and tighten the pinion nut to achieve proper preload as measured with an inch-pound torque wrench.
7. Install the carrier with ring gear, set backlash between 0.006 and 0.010 inch using side bearing shims.
8. Verify gear contact pattern using marking compound; adjust shims until pattern is centered on drive and coast sides.
9. Reinstall differential cover with RTV sealant, fill with the correct gear oil, and torque cover bolts to spec.
10. Reinstall axle shafts and test for noise or vibration before returning vehicle to service.

California Proposition 65 Warning: This product can expose you to chemicals including lead and its compounds, which are known to the State of California to cause cancer and reproductive harm. For more information, go to www.P65Warnings.ca.gov.