1986-14 Ford Performance Mustang 3.73 Gear Kit for 8.8 by Ford Performance

1986-14 Ford Performance Mustang 3.73 Gear Kit for 8.8
1986-14 Ford Performance Mustang 3.73 Gear Kit for 8.8
Ford Racing Rear End Gears & Mustang 8.8 Ring and Pinion Installation Kits
Mustang Rear End Gear Installation: Ford Racing 8.8 Ring & Pinion

Improve acceleration in your 1986-2014 Mustang with this Ford Performance 3.73 gear kit!

Item #LRS-4209FRB-K

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  • Improved Acceleration
  • Eliminates Guesswork
  • Everything You Need To Do The Job Right


  • Royal Purple Gear Oil Virtually Eliminates Wear
  • Friction Modifier Provides Smooth Operation & Prevents Chatter

 What's in the Box

  • (1) Ford Performance Parts 3.73:1 gearset
  • (1) Outer 2012 GT500 Style Pinion Bearing & Race
  • (1) Inner 2012 GT500 Style Pinion Bearing & Race
  • (1) Carrier Shim Set
  • (1) Pinion Shim Set
  • (2) Carrier Bearings with Races
  • (1) Pinion Seal
  • (10) Ring Gear Bolts
  • (2) Crush Sleeve
  • (2) Pinion Nut
  • (1) Tube Gear Marking Compound
  • (1) Cover Gasket
  • (1) Bottle of Ford Racing Friction Modifier
  • (2) Bottles of Royal Purple 75W140 gear oil

Ford Performance Mustang 3.73 Gear Kit

These Ford Performance Mustang 3.73 gears are a great way to improve acceleration to make your Mustang faster! This kit fits the 1986-2014 Mustang with an 8.8" rear end. The kit includes Ford Performance 3.73 gears, a Yukon gear install kit with American-made Koyo bearings, a bottle of Ford Performance friction modifier, and 2 bottles of Royal Purple 75W140 gear oil.

Additionally, the bearing kit comprises a GT500-style pinion bearing, new carrier bearings, pinion seal, ring gear bolts, pinion nut, crush sleeve, shims, and marking compound. This kit streamlines gear installation, making it quick and easy.

Ford Racing Friction Modifier

Ford Racing friction modifier is a specially formulated additive to provide smooth operation of clutch-type, limited-slip differentials. One bottle of friction modifier is required when changing the gear oil in rear ends equipped with Ford traction-lock units.

Royal Purple Max-Gear Oil

Royal Purple Max-Gear gear oil is an ultra-tough automotive gear oil. It’s designed to maximize power and provide unsurpassed protection to heavily loaded gears. It makes gears run smoother, quieter, cooler, and longer without overhauls. Max-Gear stands out from other gear oils due to its blend of premium synthetic oils and Royal Purple's exclusive Synslide additive technology, delivering superior performance.

Installation Note

  • Although the Royal Purple gear oil has a friction modifier mixed in, it is still recommended that you use the bottle of Ford Performance friction modifier to supply your 8.8 rear ends with the proper amount of modifier.
  • PVTKF8.8-B 2012 GT500 high-torque rear pinion bearings are included as an Upgrade for Factory Components and works on all 1986-2014 Mustang 8.8 differentials.
  • LMR recommends the 75W140 viscosity for all 1986-2014 8.8" differentials as it is appropriate for most climates, fuel economy, and performance.



  • Fits 1986-2014 Mustang with 8.8" Rear End

Speedometer Correction

  • After installation of rear gears, you will need to correct the speedometer. There are different methods to do this depending on year model.

1979-1995 Speedometer Correction - Click Here
1996-Present Speedometer Correction - Click Here

Ford Performance Racing Parts "Packs" and Component Parts Limited Warranty - Click Here
Ford Performance Racing Parts - NO WARRANTY - Click Here
Ford Performance Racing Parts Crate Engine Limited Warranty - Click Here

  • Ford Mustang - 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
  • Does not fit 2013 Boss or 2013-2014 GT500 with rear axle codes S-215-D and S-219-D
  • Some track pack option cars will require the larger pinion bearing - LRS-4625AB

Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more. The best place to go for anything Mustang related!

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About This Brand

Ford Performance
Ford Performance - Mustang Ford Racing Parts
Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning. is proud to offer Ford Racing Performance Parts for your project. Ford Racing is dedicated to manufacturing the highest quality products offered in the industry. Choose from suspension, exhaust, wheels, and other performance parts at Late Model Restoration. If you want the best for your Mustang or SVT Lightning, look no further than Ford Performance Parts!
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