Yukon Gear High Performance Gear Set For 15+ Ford 8.8in in a 4.56 Ratio

Yukon Gear High Performance Ring and Pinion Gear Set for 2015 and Up Ford 8.8 Inch in 4.56 Ratio

The YG F8.8-456-15 from Yukon Gear is engineered for 2015 and up Ford F-150 and Mustang owners running the Ford Super 8.8 inch rear differential who want to restore powertrain performance after upgrading to larger tires. This YG F8.8-456-15 ring and pinion gear set features a 4.56 ratio, one of the most aggressive gear choices for serious off-road or high-performance builds. Yukon Gear manufactures the YG F8.8-456-15 from high-grade steel using advanced heat-treating processes and precision-ground tooth profiles for reduced noise and extended service life.

Features and Benefits

• High-grade steel construction with advanced heat treatment for fatigue resistance
• Precision-ground tooth surface reduces friction and heat buildup under load
• Designed specifically for the Ford Super 8.8 inch differential platform
• 4.56 ratio delivers maximum torque multiplication for larger tire installations
• Compatible with Ford OEM limited slip and aftermarket locking differentials
• Meets or exceeds original equipment tolerances for smooth, quiet operation
• Eligible for Yukon Gear Y.E.S. extended protection plan
• Engineered by the same team behind Yukon Grizzly and DuraGrip traction products

Vehicle Fitment

Product Specifications

What Is Included

• One ring gear
• One pinion gear
• Installation instruction sheet

Frequently Asked Questions

What differential does the YG F8.8-456-15 fit?
This gear set is designed specifically for the Ford Super 8.8 inch differential found in 2015 and up F-150 and Mustang models. It is not interchangeable with the earlier Ford 8.8 inch differential.

Do I need an install kit with the YG F8.8-456-15?
Yes. A differential installation kit with bearings, shims, and a crush sleeve or solid spacer is required for proper installation and must be purchased separately.

Is 4.56 the right ratio for my build?
A 4.56 ratio is ideal for builds running 37 inch or larger tires and is common in dedicated off-road or towing applications where maximum torque multiplication is desired.

What does the Magnuson-Moss Warranty Act mean for my powertrain warranty?
The Magnuson-Moss Warranty Act of 1975 prevents dealers from voiding your OEM warranty solely because you installed an aftermarket part. The dealer must demonstrate that the aftermarket part directly caused the failure.

Can I use YG F8.8-456-15 with a locker differential?
Yes. This gear set is compatible with most locker differentials designed for the Ford Super 8.8 platform, including ARB Air Locker, Eaton ELocker, and other aftermarket options.

How do I confirm I have the Ford Super 8.8 and not the standard 8.8?
The Super 8.8 uses a 34-spline pinion and was introduced in 2015 F-150 and Mustang platforms. Vehicles before 2015 typically use the older 28 or 31-spline Ford 8.8.

What gear oil should I use after installing YG F8.8-456-15?
Use a high-quality 75W-140 synthetic gear oil meeting Ford specification. If the vehicle has a limited slip differential, add the appropriate friction modifier per manufacturer recommendations.

Is there a break-in period for this gear set?
Yes. Yukon Gear recommends driving conservatively for the first 500 miles after installation to allow proper gear surface contact and heat dissipation.

Installation Instructions

1. Drain the differential and remove axle shafts and the differential cover.
2. Mark bearing caps for correct reinstallation and remove the carrier assembly.
3. Remove the old ring gear from the carrier and clean the mating surface thoroughly.
4. Install new ring gear from YG F8.8-456-15 and torque ring gear bolts in a star pattern.
5. Remove old pinion, bearings, and crush sleeve from the differential housing.
6. Press new pinion bearings into the housing and onto the pinion shaft.
7. Install a new crush sleeve and set pinion depth with shims and a dial indicator.
8. Torque pinion nut to achieve proper pinion bearing preload with an inch-pound wrench.
9. Reinstall carrier and set ring and pinion backlash to the specified range.
10. Verify contact pattern with gear marking compound before closing the differential.
11. Reinstall the cover with a new gasket or RTV sealant and refill with correct gear oil.
12. Drive carefully for 500 miles to complete the gear break-in process.

Prop 65 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.