Yukon Gear Mustang Duragrip Posi Rear Differential - 31 Spline 8.8 in. YDGF8.8-31-1 (86-14 V8; 11-14 V6)

Yukon Gear Duragrip Posi Rear Differential - 31 Spline 8.8 in. (11-14 V6; 86-14 V8, Excluding 13-14 GT500)

10 Reviews 6 Answers

Market Price $580.02 You Save 12% ($66.73)

Starting At

$513.29

FREE Shipping

Item 21612
MPN# YDGF8.8-31-1

Local Install Shops

Quoted installation from $125

View 3 Shops

near 19355 (change)

Sorry, please enter a valid US or CA postal code

We're sorry, zip can't be updated at this time.

Will this fit your Mustang?

In Stock Ships same business day.

Ship to: ASHBURN - 20146

Sorry, please enter a valid US or CA postal code

We're sorry, zip can't be updated at this time.

Add to Cart

Save for later

Create a list

Name your new list Add to New List

Saved - View your saved items

We're sorry. We couldn't save this product at this time.

Features & Details

Put All Your Power to the Pavement
Assembled 8.8" Limited Slip Differential
Heavy Duty - Nodular Case with Forged 4320 Internals
Composite Clutches Included
Requires 31 Spline Axles
Fits 1986-2014 V8 and 2011-2014 V6 (Excludes 1999-2004 Cobra and 2013-2014 GT500)

Product Resources

Customer Photos (4) Customer Reviews (10) Questions (4) & Answers (6)

Duragrip Posi Differential. Stop doing those ridiculous one wheel burn outs by upgrading to a Yukon 8.8in 31 Spline Duragrip Posi Differential from AmericanMuscle. A Limited Slip Differential (LSD) sometimes referred to as a "Posi" will allow both rear wheels to plant the power to the pavement giving you better traction and more impressive burnouts.

Heavy Duty. Featuring a case constructed from nodular iron, this Yukon Gear Duragrip Limited Slip Differential boast forged 4320 steel internals and composite clutches for dependable heavy duty performance and long life.

Application. This 8.8" Yukon Gear Duragrip Posi Differential will fit solid axle suspensions equipped V8 Mustangs from 1986 to 2014 as well as 2011 to 2014 V6 Mustangs. Requires use of 31 spline axles. (Will not fit the 1999-2004 Cobra and 2013-2014 GT500).

Application Note. 1986-2004 V8 Mustangs came factory equipped with 28 spline axles. All 2005 and newer V8 Mustangs come equipped with 31 spline axles.

Technical Note. You will need to reuse your factory 8.8” gear set, or upgrade to a set of our 8.8" rear gears required for this Limited Slip Differential. No aftermarket gears are included. For normal driving conditions we recommend you use 75W 90 rear gear oil. This will give you the same oil weight as factory. For colder temps or race use try 75w 140.

Fitment: 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 Details

What's in the Box

(1) 8.8" Limited Slip Differential

Installation Info

Installation Time: (approx) 4 Hours

Difficulty Level:Mechanical expertise or professional installation required.

Installation Guides:

Tech Specs

Specifications:

8.8" Limited Slip Differential
Heavy Duty
10 bolt cover
Requires 31 spline axles
Requires 3 quarts gear oil
Requires 4 ounces of CM-19546-A1 friction modifier with initial fill
Fits solid or independent rear suspension

Tech Guides:

Fox Body Rear Gears & Ratios Explained

Will it fit my Mustang?

Boss 302 - 12, 13
Bullitt - 01, 08, 09
Cobra - 93, 94, 95, 96, 97, 98, 99, 00, 01, 03, 04
Cobra R - 93, 95, 00
GT - 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 00, 01, 02, 03, 04, 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
GT500 - 07, 08, 09, 10, 11, 12
LX - 87, 88, 89, 90, 91, 92, 93
Mach 1 - 03, 04
Other - 86
V6 - 11, 12, 13, 14

Fits Mustangs equipped with a 8.8" rear end. Will not fit the 1999-2004 Cobra and 2013-2014 GT500.

4 Questions / 6 Answers

Sort By Not finding an answer? Ask a Question

if i changed to 31 spline axles could i use this for a 05 mustang with a v6

danielc

This Yukon Gear Duragrip Posi Rear Differential is designed for 8.8" differentials. Since your 2005 V6 is equipped with a 7.5" differential, this would not fit properly even with the correct axles. If your vehicle is equipped with an 8.8" rear, then this would work well with 31 splined axles.

AMJEFF

Helpful (0)

Would this be able to fit in a 99-04 V6?

RevyWolf

This differential will not fit a 99-04 V6 Mustang, as they are equipped with 7.5" differentials. To utilize this differential it would require an 8.8" differential and the associated components such as the carrier, axles, etc.

AMJEFF

Helpful (0)

Which weight gear oil is recommended with this differential and should I Use synthetic or non synthetic?

Anonymous

We recommend using 75w90 rear gear oil as it is the same oil weight as the factory. If you are using this in colder temperatures, we recommend switching to 75w140. Also, synthetic oil is always better than non synthetic especially for the rear gears.

KevinD92

Helpful (0)

Is a Friction modifier needed? I know the OEM differentials require a friction modifier, does the Yukon need the same added to it?

ScreamnV8

Not if you use Royal Purple. If you use Mobile 1 or anything else, yes.

Joser
Yukon recommends the use of high grade GL-5 gear oil and a bottle of Limited slip additive additive for long life and smooth operation. The use of synthetic fluid could in aggressive or noisy operation.

Allen
It's not required if your using Royal Purple gear oil! I do recommend using it still though!

Joes02

Show 2 more answers Helpful (0)

Customer Reviews (10) Write a Review

Overall Rating

3.7

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

Performance Gain 3.5 3.5
Fit 3.777778 3.8

no one in the world ever gets what they want, and that is beautiful

Sort By
Filter By

1/5
April 06, 2018

Ehhh

Dont get this it will break, ended up returning it and theow in 10-15 more bucks to get eatons lsd diff. It has carbon fiber clutches and makes both wheels hook HARD

Swaggyd

Year: 2011 Submodel: GT

Helpful (2) Thanks for your input!
- Performance Gain 1
  1
- Fit 1
  1
1/5

Installation Time: Afternoon

February 27, 2018

JUNK

I only have 400hp and on the 5th run it went done no more 100 JUNK!!!!

RockyF

Year: 2002 Submodel: GT

Helpful (1) Thanks for your input!
- Performance Gain 1
  1
- Fit 5
  5
5/5
February 19, 2017

Use non synthetic.

AM said to use a synthetic oil but if you go on yukons web site they clearly say to use gear oil non synthetic which is what I used and it's whisper quiet and no issues yet the duragrip posi works flawlessly.

Terter

Year: 2014 Submodel: GT

Helpful (4) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
1/5

Installation Time: Afternoon

November 14, 2016

Junk

Got around 670 street miles and 2 trips to the track before this thing exploded. Took a bunch of pics and sent to Yukon, their support was awful. They may make great stuff for trucks but I'll never use a Yukon again. 670rwhp ProCharged E85 '13 - in just a couple months I'm buying a new diff, gear set, bearings, and paying shop labor to do this again, do yourself a favor and find another product.

Beznich

Year: 2013 Submodel: GT

Helpful (2) Thanks for your input!
- Performance Gain 1
  1
- Fit 1
  1
5/5
October 04, 2016

Awesome

Very quality product..and fast and great shipping from American muscle

Tbbuilt

Year: 2012 Submodel: V6

Helpful (3) Thanks for your input!
4/5

Installation Time: Full Day

September 24, 2015

nice upgrade

Everything went in good except for the clips its a pretty tight fit other than that awesome upgrade

josh970

Year: 2008 Submodel: GT colorado

Helpful (2) Thanks for your input!
- Performance Gain 5
  5
- Fit 2
  2
- Bang for your Buck 4
  4
5/5

Installation Time: Afternoon

January 16, 2015

power posi

This product offers power traction in various conditions that improved my wheel spin. Even ender normal driving conditions. I'm pleased that this is what you need. With out over thinking performance as a daily driver it has the ability.

gtspeed

Year: 2000 Submodel: GT Hollywood, FL, USA

Helpful (2) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $100-$250

September 20, 2013

awesome product and awesome price!!!

I broke the spider gears in my 2012 GT differential. I debated over the Yukon vs. the Eaton, but after talking with many dealers, I found that they are pretty much built with the same design. After the install, it seems to be working great with no noise or problems. I would highly recommend this product based on the fact that its an upgrade over ford traction lok without a large price difference.

zaks12gt

Year: 2012 Submodel: GT Sumter, SC, USA

Helpful (3) Thanks for your input!
- Fit 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Weekend

May 01, 2013

Great Product For The Price!

i had blown my original LSD while having fun, installed this with some issue due to me but once that went away and i broke it in, phenomenal product. installed and had a solid feel of the rear end and grip!! Not to aggressive for street but aggressive enough to hold it's own!

ScreamnV8

Year: 1989 Submodel: GT NH

Helpful (2) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
- Bang for your Buck 5
  5
5/5

Installation Time: Afternoon

December 22, 2012

This product has espectacular

The car improve at the start. And the quarter mile time improve also.

Ray805

Year: 2000 Submodel: GT

Helpful (6) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
- Bang for your Buck 5
  5