Powered by Mustang Enthusiasts - Call Now (866) 507-3786

1986-14 Mustang Yukon 3.73 Gear Kit by Yukon

Details   |  Videos   |  Reviews

Details   |   Videos   |   Reviews
1986-14 Mustang Yukon 3.73 Gear Kit
1986-14 Mustang Yukon 3.73 Gear Kit
1986-14 Mustang Yukon 3.73 Gear Kit
1986-14 Mustang Yukon 3.73 Gear Kit
1986-14 Mustang Yukon 3.73 Gear Kit
1986-14 Mustang Yukon 3.73 Gear Kit
Mustang Rear End Gear Installation: Ford Racing 8.8 Ring & Pinion

Improve acceleration in your 1986-2014 Mustang with this complete Yukon 3.73 gear kit!

Item #LRS-4209FRG-K

Everyday Low Price: $279.99

In Stock Ships tomorrow!
 This item is returnable. Details

Free Shipping over $99

 Add to Cart

Not Available for APO or Air shipping.

× close


  • Increased Acceleration
  • Smooth & Quiet Performance
  • Complete Kit


  • 3.73:1 Ratio
  • Heavy Duty Construction
  • Royal Purple Gear Oil

 What's in the Box

  • See Below

Mustang Yukon 3.73 Gear Kit

Increase acceleration on the street and the track with this Yukon 1986-2014 Mustang 3.73 gear kit! Rear-end gears are the best way to get a "seat of the pants" increase in performance on your Mustang. Once installed, you can instantly feel the difference, unlike most other modifications! Yukon gears feature a heavy-duty construction that's built to last! Each gear is precision machined for a smooth and quiet operation for years to come. Yukon backs this gear kit against the manufacturer's defects for one year. This kit includes everything needed to install 3.73 gears on your Mustang!

Gear Installation Kit

The gear install kit w/American-made Koyo bearings install kit from Yukon Gear includes everything you need for a ring and pinion gear swap on a Mustang 8.8" rear axle. This kit includes the same style high torque pinion bearing found in the 2012 Mustang GT500. This bearing increases durability for modified Mustangs. Along with the GT500 style bearing, this kit includes a carrier and pinion shim set, carrier bearings w/ races, pinion seal, ring gear bolts, crush sleeve, pinion nut, marking compound, and differential cover gasket!

Motorcraft Friction Modifier

Motorcraft 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 outperforms other gear oils because it combines the highest quality synthetic oils with Royal Purple’s proprietary Synslide additive technology.

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.

What's In The Box

(1) Yukon 3.73 Gear Set
(1) Inner 2012 GT500 Style Pinion Bearing & Race
(1) Outer 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
(1) Crush Sleeve
(1) Pinion Nut
(1) Tube Gear Marking Compound
(1) Cover Gasket
(1) Bottle of Motorcraft Friction Modifier
(2) Bottles of Royal Purple 75W140 gear oil


  • 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

Yukon Gear & Axle 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 axle codes S-215-D and S-219-D
  • Some track pack option cars will require the larger pinion bearing - LRS-4625AB

Mustang Rear End Gear Installation: Ford Racing 8.8 Ring & Pinion

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!

  • How To Install Mustang Gears

    Watch our 8.8" Mustang Rear End Gear Installation Video here. We also cover many ring and pinion questions that most Mustang enthusiasts ask about when replacing their rear-end gears. more

    Read more: mustang , ford racing , ford performance , how to , install , installation , rear end , rear end gear , ring and pinion , 79 93 mustang , 94 04 mustang , 05 09 mustang , 10 14 mustang

    Posted on 6/23/2017

  • California Residents:
    Prop 65 Warning SignWARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

    About This Brand

    Yukon - Yukon is Stronger and Lasts Longer
    Yukon strives to exceed expectations of high quality, competitive pricing and value for their customers. By manufacturing product with state of the art software, Yukon's in house experts provide stronger, reliable axles, gears, rear ends, and many other differential parts for Ford Mustangs. Proven to hold up to the extremities of the drag strip, road course, and circle tracks, these products are built to last! Get the right 28 spline or 31 spline performance Yukon axles for your Mustang at LMR.com

    Look for Similar Items by Category

    1979-1993 Mustang Fox Body Parts » 1979-1993 Mustang Fox Body Drivetrain » 1979-1993 Fox Body Mustang Rear End Gears
    1994-2004 Mustang Parts » 1994-2004 Mustang Drivetrain » 1994-2004 Mustang Rear End Gears
    2005-2009 Mustang Parts » 2005-2009 Mustang Drivetrain » 2005-2009 Mustang Rear End Gears
    Mustang & Lightning Tech, Articles, How To Videos » 94-04 Mustang Tech, Articles, How To Videos » 94-04 Guides » Mustang Rear Gear Ratio To RPM Chart
    1994-2004 Mustang Parts » 2003-2004 SVT Cobra Parts » 2003-2004 Cobra Clutches, Shifters, Gears, & More
    2010-2014 Mustang Parts » 2010-2014 Mustang Drivetrain » 2010-2014 Mustang Rear End Gears

    Products by Vehicle

    Add to Cart