Yukon Gear High Performance Gear Set For 10 & Down Ford 10.5in in a 4.88 Ratio

Yukon Gear High Performance Ring and Pinion Gear Set for 2010 and Down Ford 10.5 Inch in 4.88 Ratio

Truck owners running heavy-duty Ford F-250, F-350, or E-350 vehicles will recognize the Ford 10.5 inch 14-bolt rear differential as one of the toughest factory axle assemblies ever produced. The YG F10.5-488-31 from Yukon Gear delivers a high-quality 4.88 ratio ring and pinion upgrade designed for 1999 through 2010 Ford Super Duty and E-Series applications. This YG F10.5-488-31 set is made from premium high-grade steel with advanced heat treatment and precision gear geometry to withstand the demands of towing, hauling, and heavy off-road use. When you install the YG F10.5-488-31, you restore powertrain performance lost after upgrading to larger tires or changing the vehicle's gearing requirements.

Features and Benefits

• High-grade steel construction with advanced heat treatment for maximum load capacity
• 4.88 ratio ideal for heavy-duty applications with larger tires on Super Duty trucks
• Precision-ground tooth profile for reduced friction and lower operating temperatures
• Designed for the Ford 10.5 inch 31-spline pinion differential platform
• Compatible with factory limited slip and aftermarket locker installations
• Meets or exceeds OEM tolerances for smooth, quiet performance under load
• Eligible for Yukon Gear Y.E.S. extended service protection plan
• Popular upgrade for F-250, F-350, and Excursion owners running 35 inch tires or larger

Vehicle Fitment

Product Specifications

What Is Included

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

Frequently Asked Questions

What differential uses the YG F10.5-488-31?
This set fits the Ford 10.5 inch 14-bolt rear differential found in 1999 through 2010 Ford F-250 Super Duty, F-350 Super Duty, and E-Series van platforms.

Do I need a rebuild kit alongside YG F10.5-488-31?
Yes. A master installation kit including bearings, seals, and shims is required for a complete ring and pinion replacement and should be purchased separately.

Why regear a Ford Super Duty with the 4.88 ratio?
Larger tires significantly raise the effective axle ratio, reducing torque and throttle response. A 4.88 ratio reinstates performance levels close to factory feel when running 37 inch or larger tires.

Does the Magnuson-Moss Warranty Act protect my Ford warranty?
Yes. The Magnuson-Moss Warranty Act prohibits dealers from denying warranty coverage simply because an aftermarket part was installed. The dealer must prove the part caused a specific failure.

Will YG F10.5-488-31 work with a limited slip differential?
Yes. This ring and pinion set is compatible with the Ford factory limited slip carrier and most aftermarket lockers designed for the Ford 10.5 inch differential.

What is the ring gear bolt count on the Ford 10.5 differential?
The Ford 10.5 inch differential uses 12 ring gear bolts. Always torque ring gear bolts to specification in a cross pattern during installation.

What gear oil is correct for the Ford 10.5 differential?
Use a 75W-140 full synthetic gear oil rated for limited slip applications. Ford recommends Motorcraft Synthetic Gear Lube XT-M5-QS or equivalent.

How do I know if my Ford F-350 has a 10.5 inch rear differential?
Most 1999 through 2010 Ford F-250 and F-350 Super Duty trucks came standard with the Dana 60 or Ford 10.5 inch 14-bolt axle. Check the door sticker or axle tag to confirm the axle code.

Installation Instructions

1. Raise the vehicle and secure on jack stands, then drain the differential fluid.
2. Remove the rear axle shafts and differential cover.
3. Mark bearing caps for correct orientation and remove the carrier from the housing.
4. Press off the old ring gear and thoroughly clean the carrier mounting surface.
5. Press on the new ring gear from YG F10.5-488-31 and torque bolts in a star pattern to factory specification.
6. Remove the old pinion, bearings, and crush sleeve or shim pack from the housing.
7. Press new bearings onto the pinion shaft and into the housing bores.
8. Set pinion depth with shims and confirm with a dial indicator and pinion depth tool.
9. Set pinion bearing preload using an inch-pound torque wrench.
10. Install the carrier assembly and set backlash to the specification range.
11. Verify contact pattern with gear marking compound before final assembly.
12. Reassemble the differential, refill with correct gear oil, and reinstall axle shafts.

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.