Yukon Gear Master Overhaul Kit For Dana 80 Diff (4.375in OD Only On 98+ Fords)

Full Rebuild Kit for the Dana 80 Differential on 1998-and-Up Ford Super Duty Trucks

The YK D80-B from Yukon Gear provides every component necessary to completely rebuild the Dana Spicer 80 rear differential found on 1998-and-newer Ford F-350 Super Duty, F-450, F-550, and E-350 Super Duty applications. The kit is designed around the 4.375-inch O.D. inner pinion bearing that Ford adopted for the Dana 80 starting with the 1998 model year, distinguishing YK D80-B from the earlier 4.125-inch-bearing kit. Inside the box you will find Timken carrier bearings, Timken inner and outer pinion bearings, a full shim assortment, ring gear bolts, a pinion nut, pinion seal, oil baffles, slingers, thread locker, silicone, and gear marking compound so the YK D80-B covers every aspect of a proper differential rebuild in one purchase.

Features and Benefits

• Engineered specifically for the 4.375-inch O.D. Dana 80 pinion bearing used on 1998-and-up Fords
• Timken carrier bearings and races for superior load capacity and longevity
• Timken inner and outer pinion bearings with precision-matched races
• Complete shim set for both pinion depth and carrier bearing preload adjustments
• High-quality pinion seal to eliminate gear-oil leaks at the yoke
• Oil baffles and slingers included to protect bearings from contamination
• Ring gear bolts and thread locking compound for secure ring gear fastening
• Pinion nut for proper clamping load on the pinion shaft
• Gear marking compound and brush for contact-pattern verification
• RTV silicone included for differential cover sealing
• 1-year manufacturer warranty against defects

Vehicle Fitment

Specifications

What Is Included

• Timken carrier bearings and races (pair)
• Timken inner pinion bearing and race (4.375-in. O.D.)
• Timken outer pinion bearing and race
• High-quality pinion seal
• Complete shim kit (carrier and pinion depth)
• Ring gear bolts (12-bolt pattern)
• Pinion nut
• Crush sleeve
• Oil baffles and slingers
• Thread locking compound
• Gear marking compound with brush
• RTV silicone for differential cover
• 20-page installation instruction sheet

Frequently Asked Questions

Does the YK D80-B include a crush sleeve?
Yes. The YK D80-B includes a crush sleeve for the Dana 80 differential so you can establish correct pinion bearing preload during assembly.

What differential does YK D80-B fit?
The YK D80-B fits the Dana Spicer 80 rear differential on 1998-and-newer Ford trucks and vans that use the 4.375-inch O.D. inner pinion bearing. This covers F-350 Super Duty through F-550 Super Duty and E-350 Super Duty applications.

How is YK D80-B different from YK D80-A?
The YK D80-B is designed for 1998-and-up Fords with the 4.375-inch O.D. pinion bearing and 37-spline axle shafts, while the YK D80-A covers older applications using the 4.125-inch O.D. pinion bearing.

Does YK D80-B include ring gear bolts?
Yes. The YK D80-B includes ring gear bolts and thread locking compound as part of the complete kit.

Are Timken bearings used in YK D80-B?
Yes. Both the carrier bearings and all pinion bearings included in YK D80-B are Timken-brand components for OEM-quality performance.

Does YK D80-B fit the Dana 80 on Dodge Ram trucks?
The YK D80-B is designed for 1998-and-up Ford applications with the 4.375-inch O.D. pinion bearing. Dodge Ram Dana 80 applications use the 4.125-inch O.D. design; those require the YK D80-A kit.

What warranty covers YK D80-B?
Yukon Gear provides a 1-year limited warranty against manufacturer defects on the YK D80-B. Under the Magnuson-Moss Warranty Act, this written warranty gives you specific legal rights, and you may have additional rights that vary by state.

Does YK D80-B include oil baffles and slingers?
Yes. Oil baffles and slingers are included in the YK D80-B to protect bearings from contamination during operation.

Installation Overview

1. Drain gear oil and remove the differential cover; clean all mating surfaces.
2. Remove the carrier assembly; inspect housing bore and bearing pockets for wear.
3. Press out the existing pinion and remove all old bearings and races.
4. Drive new Timken inner and outer pinion bearing races into the housing.
5. Set pinion depth using the shims from the YK D80-B kit and a dial indicator.
6. Install the crush sleeve and new inner pinion bearing; insert pinion into housing.
7. Install the outer pinion bearing, oil slinger, and new pinion seal from the kit.
8. Install yoke and tighten the new pinion nut to achieve correct pinion bearing preload.
9. Press new Timken carrier bearings onto the carrier; lower carrier into housing.
10. Adjust carrier shims to achieve factory-specified ring gear backlash.
11. Coat ring gear teeth with marking compound; verify contact pattern and adjust as needed.
12. Torque ring gear bolts with included thread locker to specification.
13. Seal and reinstall the differential cover; refill with the appropriate gear oil.

Proposition 65 Warning: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.