Yukon Gear High Performance Gear Set For 10 & Down Ford 10.5in in a 3.73 Ratio

Yukon Gear Ring & Pinion Gear Set for Ford Sterling 10.5 in. (1999-2010) (YG F10.5-373-31)

The YG F10.5-373-31 is a Yukon Gear high performance ring & pinion gear set precision-engineered for the Ford Sterling 10.5 in. (1999-2010). Built for enthusiasts and professionals demanding consistent performance under the most demanding conditions, the YG F10.5-373-31 uses CNC-machined gear profiles and vacuum heat-treated alloy steel to deliver superior tooth strength, reduced friction, and extended service life. The YG F10.5-373-31 is the popular all-around ratio for the Ford Sterling 10.5 inch axle, balancing daily drivability with improved off-road capability.

Features and Benefits

• High-grade alloy steel construction engineered for heavy-duty applications
• CNC-machined tooth geometry optimized for low friction and heat generation
• Vacuum heat treatment provides consistent case hardness and core toughness
• Precision-machined to OEM tolerances for straightforward installation in the Ford Sterling 10.5 in. (1999-2010)
• Compatible with most factory and aftermarket limited-slip, locker, and open differentials
• One-year manufacturer warranty; optional Yukon Y.E.S. lifetime protection plan available
• Sold as a matched ring and pinion set for synchronized break-in and wear patterns
• Excellent choice for vehicles running larger tires or modified for towing and off-road use

Vehicle Fitment

Specifications

What Is Included

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

Frequently Asked Questions

Q: What differential does YG F10.5-373-31 fit?
A: The YG F10.5-373-31 is engineered specifically for the Ford Sterling 10.5 in. (1999-2010). Confirm your axle model, housing type, and pinion spline count before ordering.

Q: What gear ratio does YG F10.5-373-31 provide?
A: This set delivers a 3.73 gear ratio for the Ford Sterling 10.5 in. (1999-2010). This ratio is ideal for vehicles running larger than stock tires or requiring more low-speed torque.

Q: Is a new carrier required when installing YG F10.5-373-31?
A: Depending on the ratio change, a new differential carrier may be required. Consult the Yukon gear ratio guide or contact a drivetrain specialist to confirm carrier compatibility for your specific axle ratio change.

Q: What warranty comes with YG F10.5-373-31?
A: Yukon Gear backs the YG F10.5-373-31 with a one-year warranty against manufacturer defects. The Magnuson-Moss Warranty Act ensures that installing aftermarket parts like YG F10.5-373-31 cannot void your vehicle's original manufacturer warranty unless the part is proven to have caused a specific failure.

Q: What break-in procedure is required for YG F10.5-373-31?
A: After installing YG F10.5-373-31, avoid sustained highway speeds and heavy towing for the first 500 miles. Change the differential fluid after the break-in period to flush out metal particles.

Q: What gear oil should I use after installing YG F10.5-373-31?
A: Use the gear oil type and viscosity recommended for your specific differential. For limited-slip applications, always add friction modifier additive as required. Consult your Yukon installation guide for specific recommendations.

Q: Can I install YG F10.5-373-31 myself?
A: Professional installation is recommended. Proper backlash, pinion depth, and bearing preload settings are critical. Improper setup leads to premature gear failure. A dial indicator, a bearing press, and a torque wrench are the minimum required tools.

Q: Will installing YG F10.5-373-31 affect my vehicle's factory warranty?
A: Under the Magnuson-Moss Warranty Act, a vehicle manufacturer must prove that an aftermarket part directly caused the failure before denying warranty coverage. Simply having an aftermarket part installed is not sufficient grounds to void your vehicle warranty.

Installation Instructions

1. Support the vehicle safely on jack stands and remove the differential cover. Drain all fluid.
2. Remove the driveshaft and the differential carrier assembly from the axle housing.
3. Record factory shim thicknesses and bearing preload values before disassembly.
4. Press the old ring gear off the carrier. Clean all mating surfaces thoroughly.
5. Press the new ring gear from the YG F10.5-373-31 set onto the carrier, heating to 250 degrees F if needed.
6. Install the new pinion gear with the appropriate depth shim. Set pinion bearing preload per Yukon specifications.
7. Install the carrier, set carrier bearing preload and backlash per the Yukon gear installation guide included with YG F10.5-373-31.
8. Apply gear marking compound and verify the tooth contact pattern before final assembly.
9. Reinstall the differential cover with new gasket or RTV sealant. Torque bolts to specification.
10. Fill with the correct differential fluid and additive as required for the Ford Sterling 10.5 in. (1999-2010).
11. Road-test and re-inspect fluid level after 50 miles during the break-in period.
12. Change differential fluid at 500 miles to remove break-in metal particles.

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.