Ford Racing 8.8 Inch Ring Gear and Pinion installation Kit - M-4210-B2

The Ford Racing 8.8 Inch Ring Gear and Pinion Installation Kit (M-4210-B2) is the go-to solution for anyone swapping ring and pinion gears in a Ford 8.8-inch rear axle. Designed to fit a wide range of Ford, Lincoln, Mercury, and Mazda vehicles equipped with the 8.8" rear end from 1986 through 2013 — including independent rear suspension (IRS) applications — this kit from Ford Racing delivers all the hardware and consumables you need for a complete, professional-grade differential gear installation. Whether you're upgrading to a performance gear ratio on a Mustang GT, re-gearing an F-150 after a lift kit, or refreshing a Crown Victoria's rear end, this all-in-one kit eliminates the hassle of sourcing individual components separately.

Key Features & Benefits

• Comprehensive all-in-one kit: Includes every component required to complete a ring and pinion swap, so you're not hunting down individual parts or making multiple trips to the parts store mid-install.
• High-torque pinion bearings: The kit features 2012 Shelby GT500 high-torque rear pinion bearings, adding durability for modified and higher-output vehicles that place greater stress on the differential.
• Heavy duty carrier bearings: Upgraded carrier bearings are included to handle the demands of performance driving and modified powertrains.
• Broad fitment coverage: Fits all Ford 8.8-inch axles from 1986 to 2013, including IRS-equipped vehicles, making it one of the most versatile install kits available for the platform.
• Superset of M-4210-A: This kit contains all components found in the M-4210-A kit, plus all differential bearings — giving you a more complete package without needing to supplement with additional bearing sets.
• Genuine Ford Racing parts: All components are Ford Racing parts, engineered to work together for proper preload, pattern, and backlash setup.
• Gear-marking compound included: The included gear-marking compound allows you to properly check and verify your ring and pinion contact pattern during setup — a critical step for long differential life.

Specifications

• Part Number: M-4210-B2
• Brand: Ford Racing
• Application: Ford 8.8-inch rear axle (solid axle and IRS)
• Fitment Years: 1986–2013
• Weight: Approximately 7.00 lbs

What's in the Box

• 2012 Shelby GT500 high-torque rear pinion bearings
• Pinion shims
• Carrier shims
• Crush sleeve
• Pinion nut
• Pinion seal
• Ring gear bolts
• Heavy duty carrier bearings
• Gear-marking compound
• Differential cover gasket

Fitment

The M-4210-B2 fits all Ford 8.8-inch axles from 1986 to 2013, including IRS (independent rear suspension) variants. The 8.8" axle was used across an exceptionally wide range of Ford, Lincoln, Mercury, and Mazda vehicles, including but not limited to:

• Ford Mustang GT: 1986–2014 (multiple trims including Bullitt, Boss 302)
• Ford F-150: 1986–2013 (including SVT Raptor, Lightning, Harley-Davidson, King Ranch, and more)
• Ford Crown Victoria: 1992–2011 (including Police Interceptor)
• Ford Ranger: 1986–2011 (select trims with 8.8" axle)
• Ford Thunderbird: 1986–1997 (select trims)
• Lincoln Town Car: 1986–2011
• Mercury Grand Marquis: 1986–2011
• Mazda B4000: 2001–2007 (select trims)

Important exceptions — this kit does NOT fit:

• 2013 Ford Mustang Boss 302 (axle code S-215-D)
• 2013 Ford Mustang GT500 (axle code S-219-D)

If your vehicle carries either of those axle codes, a different installation kit is required. Always verify your axle code before ordering.

Why Buy from ThreePiece.us

At ThreePiece.us, we specialize in performance Ford parts and drivetrain components, and our team understands the nuances of 8.8-inch axle builds. Every order ships free, so there are no surprise freight charges on your differential rebuild parts. Need to spread out the cost of your project? Affirm financing is available at checkout, letting you get your build moving today and pay over time. Have a fitment question before you order — like whether your specific axle code is covered, or whether you need the M-4210-A versus M-4210-B2? Reach out to our team and we'll help you get the right kit the first time.

Frequently Asked Questions

Q: What is the difference between the M-4210-A and the M-4210-B2?
A: The M-4210-B2 contains all of the components found in the M-4210-A kit, plus all differential (carrier) bearings and the high-torque pinion bearings sourced from the 2012 Shelby GT500 application. If you want a more complete package that includes the carrier bearings without sourcing them separately, the M-4210-B2 is the more comprehensive choice.

Q: Does this kit fit the 2013 Mustang Boss 302 or GT500?
A: No. The M-4210-B2 specifically does not fit the 2013 Boss 302 or 2013 GT500, which use different axle assemblies identified by codes S-215-D and S-219-D. All other 8.8" axle-equipped Mustangs from 1986 through the model years listed are covered.

Q: Does this kit include the actual ring and pinion gears?
A: No. The M-4210-B2 is an installation kit — it includes the bearings, shims, crush sleeve, pinion nut, seal, ring gear bolts, gear-marking compound, and cover gasket needed to properly install a ring and pinion set. The ring and pinion gears themselves are sold separately.

Q: Is this kit appropriate for modified or high-horsepower vehicles?
A: Yes. The kit is specifically noted as an excellent upgrade for modified 8.8" rear ends, and the inclusion of high-torque Shelby GT500 pinion bearings and heavy duty carrier bearings reflects its suitability for vehicles making more power than stock.