Mustang Ford Performance 3.31 Gear Kit for 8.8" Rear End | 86-14 by Ford Performance

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

Upgrade your Mustang's stock gears with this complete 3.31 gear kit for 8.8 rear ends from Ford Performance!

Item #LRS-4209FRJ-K

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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

Benefits

Replaces Damaged Or Whining Gears
Upgrade For Fox & SN95 Gears
Complete Kit Eliminates Guesswork
OEM Quality

Features

3.31 Ratio Ring And Pinion Gears
GT500 Pinion Bearings
Royal Purple Gear Oil
Friction Modifier

What's in the Box

(1) Ford Performance Parts 3.31:1 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 3.31 Gear Kit
Improve your Mustang's acceleration and eliminate gear whine with this complete 3.31 gear installation kit! Specifically designed for the Mustang 8.8 rear end, this kit includes a Ford Performance 3.31 ring and pinion gear set that is made in the USA as well as the additional parts needed for proper installation. Also included are two bottles of Royal Purple 75W140 gear oil and one bottle of friction modifier. Ford Performance built this 3.31 gear kit with everything you will need to make the installation of the ring and pinion gear set as painless as possible.

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 is 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.
LMR recommends the 75W140 viscosity for all 1986-2014 8.8" differentials as it is appropriate for most climates, fuel economy, and performance.
PVTKF8.8-B 2012 GT500 high-torque rear pinion bearings included as an Upgrade for Factory Components and works on all 1986-2014 Mustang 8.8 differentials.

Application

Fits 1986-2014 Mustang with 8.8" Rear End

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

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!

Published on 2013-11-05
See our full line of Mustang Rear End Gears here: http://www.latemodelrestoration.com/products/Mustang-Rear-End-Gears

Are you looking to improve your ET's? Nothing improves your acceleration and helps you launch your Stang like a set of Ford Racing Rear End Gears! The FRPP ring and pinion gear sets are available in multiple gear ratios for your Ford 8.8 rear end. Each gear set includes the pinion and ring gears, crush sleeve and pinion nut. Here at LatemodelRestoration.com we know that you need more than just the gears to finish off your installation. That is why we are the originators of the Mustang Rear Gear Kits!

Each of our Gear Kits features all the needed parts for you properly install a new set of gears in your Mustang! We include only the best components in each kit. They begin with your choice of Ford Racing Rear End Gears (see below of available ratios) and then we throw in Ford Motorcraft Friction Modifier, Royal Purple Max Gear 75W-90 gear oil and finish it off with a master bearing & shim kit.

Installation of your new ring and pinion gears should always be done by a mechanic with a good working knowledge of rear end gears! We put together this how to installation video to help walk you through the install process. If you feel at any point this removal and installation process is above your mechanical skill level -- you aren't alone. Make sure you take your Mustang and new gears to a good trustworthy shop with experience installing Ford 8.8 rear end gears. This video will help you have a better understanding of what questions you should be asking and what to look for in the installation!

Changing your rear end gear ratio will require you to recalibrate your speedometer. For 83-95 Fox Body and SN95 Mustangs, you will need to replace your speedometer gear to fix your speedometer. Click the following link to see our speedometer gear calculator to properly select the correct speedometer gear - http://www.latemodelrestoration.com/products/Mustang-Speedometer-Gear-Calculator . If you have a 1996 to present Mustang your best fix is to pick up a SCT tuning device such as the SF3 handheld tuner to correct your speedometer. You can see our full line of SCT Tuners and Tech Videos here - http://www.latemodelrestoration.com/products/Mustang-SCT-Tuners .

When replacing the ring and pinion gears on your Mustang don't forget to pick up a traction lok clutch repair kit or new traction lock differential. The clutches in the factory unit wear out over time -- especially with aggressive driving. Save yourself time and money by replacing these when installing new rear end gears!!!! See our full line of Mustang Traction Lock Differentials and Repair Parts here - http://www.latemodelrestoration.com/products/Mustang-Traction-Lock-Differentials

Popular Gear Ratios:
3.08
3.15
3.27
3.31
3.55
3.73
4.10
4.56

Installation Instructions

Download the pdf Link opens in a new window

How To Install Mustang Gears

Published 6/23/17

California Residents:

WARNING: Cancer and Reproductive Harm- www.P65Warnings.ca.gov

About This Brand

Ford Performance - Mustang Ford Racing Parts
Ford Performance Parts is the leader in performance parts and accessories for Mustang and Ford Lightning.

LMR.com 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!