Yukon Ford 10.5" Ring & Pinion Gears- Super Duty, '99-'10, 31 Spline
YUKYG F10.5-355-31
This Ford Super Duty 10.5" ring and pinion gear set is designed for 1999–2010 Ford truck, van, and SUV's with the Ford 10.5" rear axle and 31 spline pinion. These gear sets are commonly used in towing, off-road, commercial, and performance applications. Ford 10.5" rear axles are widely used in Super Duty trucks, Excursions, vans, and commercial chassis because of their large ring gear size and heavy-duty load capacity.
Lower numerical ratios such as 3.55 and 3.73 are commonly used for highway towing and fuel economy, while deeper ratios like 4.56 and 4.88 help restore drivability with oversized tires or improve low-speed pulling power. Proper gear setup and preload adjustment are critical to maintaining quiet operation and long-term reliability under heavy load conditions.
Includes:
- Ford 10.5" Ring Gear
- Matching Pinion Gear
Note: Installation kit, bearings, seals, and shims sold separately unless noted
Specifications
- Fits Ford 10.5" rear differentials
- Fits 1999–2010 axle applications
- 10.50" ring gear diameter
- 31 spline pinion
- 12 ring gear bolts
- 12 cover bolts
- Available Gear Ratios: 3.55, 3.73, 4.11, 4.30, 4.56, 4.88
- Designed for heavy-duty truck and SUV applications
Fitment
|
Make |
Model |
Year Range |
|
Ford |
E-250 |
1999–2010 |
|
Ford |
E-350 Econoline Club Wagon |
1999 |
|
Ford |
E-350 Super Duty |
2000–2010 |
|
Ford |
E-450 Econoline Super Duty |
2000–2002 |
|
Ford |
E-450 Super Duty |
2003–2010 |
|
Ford |
E-550 Econoline Super Duty |
2002 |
|
Ford |
E-550 Super Duty |
2003 |
|
Ford |
Excursion |
2000–2005 |
|
Ford |
F-150 |
2000–2010 |
|
Ford |
F-250 |
1999 |
|
Ford |
F-250 Super Duty |
1999–2010 |
|
Ford |
F-350 Super Duty |
1999–2010 |
Fitment Notes:
- Fits Ford 10.5" rear differential applications only
- Designed for 31 spline pinion configurations
- Compatible with both RWD and 4WD applications where applicable
- Verify axle type and gear ratio before ordering
Tech Insight
What gear ratio should I choose?
|
Ratio |
Best For |
|
3.55 |
Highway driving, towing with stock tires |
|
3.73 |
Mixed towing and daily driving |
|
4.11 |
Mild tire upgrades, improved pulling power |
|
4.30 |
35" tires and towing |
|
4.56 |
37" tires, off-road use |
|
4.88 |
38"-40" tires, heavy off-road builds |
Will these gears fit my axle?
- 12-bolt differential cover
- 10.5" ring gear diameter
- 1999-2010 applications use a 31 spline pinion
-
Commonly found in:
- F-250 Super Duty
- F-350 Super Duty
- Excursion
- E-Series Vans
Does this include a master install kit?
This listing includes only the ring and pinion gear set. A master overhaul kit is recommended when installing new gears.
- Ford 10.5 Master Overhaul Kit
- Ford 10.5 Bearing Install Kit
Will these gears fit my existing carrier?
Yes. These gear sets fit standard Ford 10.5 carriers designed for the selected ratio range. Verify your existing carrier break before ordering.
Compatible with:
- Open Differentials
- Limited Slip Differentials
- Mechanical Lockers
- Air Lockers
- Spools