Yukon Master Overhaul kit for Ford 9ft LM104911 Differential

In this review the Yukon Master Overhaul kit for Ford 9' LM104911 is presented as a one-stop solution for technicians and experienced DIYers tackling a Ford 9' differential rebuild. The bottom line: this kit's single biggest selling point is its comprehensiveness, packing carrier and pinion bearings and races, a complete shim kit and the small parts needed to restore proper preload and backlash. For anyone who wants to minimize parts hunting and ensure quality components during a tear-down, this review finds the kit a sensible choice.

Key Features

• Complete bearing set: Carrier bearings and races plus pinion bearings and races allow a full rebuild without sourcing separate Timken units.
• Full shim kit: The included shim kit makes it possible to set pinion depth and backlash accurately for correct gear mesh.
• Hardware and seals: Ring gear bolts, pinion nut, crush sleeve and high-quality seals reduce the need to reuse old parts that could fail later.
• Assembly aids: Thread locker and marking compound with brush help achieve reliable fastener torque and correct gear pattern during setup.
• Quality sourcing: Uses Timken bearings and races and high-grade small parts, which increases confidence in long-term durability.
• Manufacturer backing: Packaged by Yukon Gear & Axle and manufactured by Randys Worldwide, indicating established supply chain oversight.

Who It's For

This kit is best for professional mechanics and experienced home builders working on a Ford 9' rear end who want to complete a comprehensive overhaul with as few additional purchases as possible. It is particularly useful when the goal is to replace bearings, races and related hardware in one service session while using trusted Timken components.

Less experienced DIYers who are unfamiliar with setting pinion preload or measuring backlash may prefer to have a shop perform the installation, since precise shimming and crush sleeve installation are required. Also, owners who need an exact match for a rare variant should verify fitment first, as some customers reported fit differences on certain applications.

Pros & Cons

Pros

• High-quality Timken bearings and races included, which improves reliability over reused components.
• Comprehensive contents reduce the chance of missing small parts mid-rebuild, saving time sourcing parts.
• Includes assembly aids like thread locker and marking compound to help achieve a correct gear setup.

Cons

• Some customers report occasional fit issues or missing parts, so checking the kit against your vehicle requirements before installation is advisable.

Specifications

Product	Master Overhaul kit for Ford 9' LM104911
Manufacturer	Yukon Gear & Axle (manufactured by Randys Worldwide)
Fitment	Ford 9' with LM104949 carrier races
Bearing type	Timken bearings and races
Contents	Carrier & pinion bearings and races, shim kit, ring gear bolts, pinion nut, crush sleeve, seals
Extras	Thread locker, marking compound with brush, pilot bearing, gasket/silicone where applicable

Our Verdict

The Yukon Master Overhaul kit for Ford 9' LM104911 is a strong value for anyone rebuilding a Ford 9' differential who wants quality Timken bearings and a very complete parts package. It streamlines the rebuild process and avoids multiple orders for small parts, though buyers should confirm fitment and inventory the kit on receipt to avoid surprises. Overall, it is recommended for technicians and confident DIYers seeking a thorough overhaul kit.

Frequently Asked Questions

Does this kit include seals and gaskets?
Yes, the kit includes pinion and axle seals and supplies gasket or silicone where applicable for the application.

Will these bearings fit any Ford 9' housing?
The kit is intended for Ford 9' applications using LM104949 carrier races; verify your carrier race type before purchase for best fit.

Are the bearings OEM quality?
The bearings and races supplied are Timken units and high-quality small parts, which are equivalent to OEM quality for most rebuilds.