Ford Performance Mustang 4.10 Gears and Install Kit 100577 (86-09 V8)

Ford Performance 4.10 Gears and Install Kit (86-09 V8)

100+ Reviews 18 Answers

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$259.99 (kit)

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Features, Video & Details

Money Saving Combo Kit
Ford Racing 4.10 Gears - 8.8"
Motive 8.8" Rear End Installation and Bearing Kit
1 Bottle of Ford Racing Friction Modifier
2 Quarts of Royal Purple Max Gear 75w90 Gear Oil
Fits 1986-2009 V8 with 8.8" Solid Rear Axle

Product Resources

Customer Photos (17) Customer Reviews (100+) Questions (39) & Answers (18)

Review & Installation Video

Improve ET's and low end torque. Are you looking to get more low end grunt off the line and lower ET's at the same time? Then look no further than installing a set of steeper gears in your Pony. This Ford Racing Ring and Pinion Gears are perfect for street, road, or race use.

Complete Kit. This Ford Racing Gear and Installation Kit comes complete with all the components needed to swap out your ring and pinion gear. It includes Ring gear, Pinion gear, 1 bottle of Friction Modifier, 2 bottles of 75w90 Gear Oil, gaskets, seals, shims, bearings and all the required hardware.

Legendary Ford Racing Quality. When you're adding performance parts to your Pony, you can't go wrong by installing parts from the folks that know it best. Ford Racing's legendary quality ensures years of hassle-free use.

Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a Speedometer Gear, a Ford Racing Speedometer Recalibration Tool or a Bama SF4/X4 Power Flash Tuner is a quick and easy way to fix this issue.

Application. This Ford Racing 4.10 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle equipped Mustangs, including the 1986-2009 GT, Bullitt, Mach 1, Shelby GT500 and 1994-1998 SVT Cobra. It will not fit the 1999-2004 IRS equipped Cobra Mustangs.

Technical Note. Installation costs will vary, but a good rule of thumb is between $250 and $300. Be sure to work with a reliable shop that you trust for installations. You can also save money on your installation labor by having your Trac-Lok rebuilt at the same time as your gears are installed, see drop down option above.

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 Details

MPN# 100577

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

What's in the Box

(1) Ring gear
(1) Pinion gear
(1) 3.8 fluid oz bottle of Friction Modifier
(2) one quart bottle of Royal Purple Max Gear 75w90 Gear Oil
Front & Rear Pinion Bearing
Pinion Seal
Carrier Bearings
Carrier Shims
Differential Bearings
Crush Sleeve
Pinion Nut
Cover Gasket
Ring Gear Bolts
Brush
Gear Marking Compound
Loctite

Installation Info

Installation Time: (approx) 4 Hours

Difficulty Level:Mechanical expertise or professional installation required.

Installation Guides:

Manufacturer:
Differential Gears - Installation Instructions

Will it fit my Mustang?

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

Questions & Answers (39)

5 Top Rated Questions

Should I get the Traction-LOK rebuild?? I have a 2007 mustang GT automatic with only 20k miles on it.. Do you think I need the traction-LOK rebuild kit.. PLEASE HELP I don't know what to do !!!!

Yes go ahead and get it. It will upgrade it the cobra and gt500 specs. The carbon discs hold up way more. And since I'm sure you'll be getting nasty with those 4.10s I'd go ahead and upgrade. You'll have to reuse your clip spring though the kit comes with a cobra spring. But yes go ahead and spend a little extra!
Unless you are going to take it to the track and do a bunch of hard launches you won't need it. If you had higher mileage I would recommend a replace or upgrade.
Since you are putting some taller gears in it sounds like you are doing some drag strip duty with your car. You are going to have the diff torn down to change the gears it would make sense to freshen up the traction loc as well.

Helpful (6) Show 2 more answers

Real quick question, ordering these gears for my 97 cobra. Which gear tooth exactly will I need to fix my speedometer?? 97 cobra stock t45

For your 97 Cobra with 4.10's you would either need a 23t speedo gear, or you would need a 6 tooth drive gear used in conjunction with a 20t speedo gear. We do not offer and recommend against the 23t speedo gear, as they have a tendency to wear prematurely not seen in the lower tooth count gears.

Helpful (3)

Do i really need the rebuilding loc kit? I have a 2001 ford Mustang gt convertible 5 speed with 97k miles I want to purchase the 4.10 install kit

The Ford Performance LOK kit is not required to do when swapping how gears, however, it would not be a bad idea to have everything changed to new when you are in and doing the gears.

Helpful (2)

will i have to update my tune through bama whenever i install these new gears? i have a bama tune and am wondering if i will have to email them requesting a tune upon installation.

Yes - for those with 1999+ V8 Mustangs, you will want to let our Bama team know that you have upgraded your gear ratio. They can add that to your tune information, which will correct your speedometer reading. Hope this helps!
Yes. The gears will affect your speedometer and shift points for transmission. If you have tuner that you can update your mods you can also do it that way. But it's really easy to call or email Bama for a custom tune.

Helpful (2) Show 1 more answer

can i use this oil ? car specifies 75-140

Use the oil that comes in the kit.
You can. The 75w-140 flows the same as 75w-90 The 90 is a thinner viscosity than the 140. Both are fine to use. I use the 140 vs the 90. Really just a preference. Ford used to call for the 90. Then changed do to the 140 being a tad better at resisting breakdown.

Helpful (1) Show 1 more answer

Not finding an answer? Ask your question! Post Your Question

10 More Questions

Do I have to have a tune with these gears? 0 answer

Will this kit work on my 28 spline? 1 answer

This Ford Racing 4.10 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle equipped Mustangs. This will work with a 28 Spline axle set-up used on a 8.8in rear end.

Helpful (0)

I have the iTSX tuner, if I get the gear kit can I correct the speedometer myself ? All ready have a tune installed . Do I HAVE to get a new tune? 06 gt automatic 1 answer

If you have custom tunes on the ITSX you would need to get a new updated tune. If you are using the pre-loaded tunes on the ITSX then you can adjust it yourself.

Helpful (0)

Do I need to buy the full rebuild kit if Im buying a brand new differential to install these for 1 answer

We recommend the full install kit as this will include everything needed for a pain free swap.

Helpful (0)

Will this work with the stock clutch or do I need to get a upgrade 1 answer

The clutch will not need to be upgraded when going with a new gear set.

Helpful (0)

is anything else needed to change gears 1 answer

This would be a full kit and would not need anything else to do the swap. A tuner would be recommended to correct the speedometer but would not be needed for the install of the gears.

Helpful (0)

I've had 2 quotes for this upgrade by local shops. 1 was for $2100.00 plus tax telling me I need to upgrade my carrier as well. the other was for $1200.00 plus tax both are way higher than the suggested cost. I own a 2007 Mustang GT 4.6L 3v that has a 3.31 rear with 8.8 axles why would the cost be so much higher than what you list on your site. 2nd question Dose this car ave a 28 or 31 spline? 1 answer

For the 2007 model years, the Mustang GT had 28 splines, the GT 500s had 31 splines. As we do not partner with any installation locations, we cannot comment on the quotes you received from local shops. Conferring with the shops in question to confirm exactly what is included in their quotes (labor, parts, shop fees) is suggested.

Helpful (0)

Would this fit my 2014 mustang gt 1 answer

This will not fit with 2014 GT Mustangs.

Helpful (0)

I was told I need to replace my rear end, would this kit be all I need to rebuild it instead of buying a new rear end? 1 answer

This kit will include all the internals that you will need to rebuild a rear end.

Helpful (0)

Hi, I have a 1996 Bronco and was wondering if one of these kits would fit the 8.8 in the truck? Was planning on installing a Detroit Trutrack locker and 4.10 gears. Thanks! 1 answer

The gears, gasket, bolts, oil and shims in the Ford Performance 4.10 Gears and Install Kit will work with any 8.8" rear, however the bearings may not work as these can vary in some Ford applications.

Helpful (0)

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Customer Reviews (100+) Write a Review

Overall Rating

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

Performance Gain 4.782609 4.8
Fit 4.904348 4.9

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

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5/5

Installation Time: Afternoon

January 09, 2019

Power!

This set up added a ton of torque to my mustang! I feel bad for my tires now, easy to burn a set up!

Timmay

Year: 2007 Submodel: GT

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

Installation Time: Full Day

January 06, 2019

Best Mustang Modification

Went from stock 3.27’s to 4.10’s in an 03 GT with a 5 speed. I drive 90 miles round trip for work daily at 70 mph and love it. Makes the car way more fun to drive. If you do the install yourself be sure to support the car by the frame to let the axle drop as low possible to make it easier to install the pinion bearing races. Have a torch handy in case you need to heat the old bearings up to drive the old pinion out.

DannyS

Year: 2003 Submodel: GT

Helpful (6) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
4/5

Installation Time: Afternoon

December 10, 2018

Good quality gears

gears are probably the best upgrade you can give your car on a budget, unless you have money to get forced induction. More often than not you probably won't be using the high end of your car unless you want to drive around going 150mph so enjoy that low end rip and get the gears. The Ford racing gears seem like they are good quality.

Enthusiast

Year: 2004 Submodel: Mach 1

Helpful (6) Thanks for your input!
- Performance Gain 5
  5
- Fit 4
  4
5/5

Installation Time: Shop Install

Installation Cost: $250-$500

November 28, 2018

Happy Stang!

Very happy with my new gear swap just what my mustang needed thank you American Muscle!

CharlesG

Year: 2007 Submodel: GT

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

Installation Time: Afternoon

November 22, 2018

New 4 10s

Just had the 4 10 gear installed all I can say is WOW

TerryL

Year: 2008 Submodel: GT

Helpful (8) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Afternoon

November 21, 2018

Awesome gains

This gear kit is really well worth the money. Comes with everything you need. I took it to my local shop. They charged me $350 for the install but its so worth it knowing it was done right. No gear noise at all. Night and day difference from 3.27 to 4.10. My cars an automatic so it helps a lot. Ordered a Bama tuner yesterday, waiting on that to get here to fix my speedometer and tune my car. Can't wait!

RobertO

Year: 2000 Submodel: GT

Helpful (9) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Afternoon

November 19, 2018

Good start

Ford Performance is the main Ring and pinion set we Order ford Ford cars and Trucks in our Shop. good quality .the kit give gives you everything, but axle bearing and seals.

Flipper

Year: 1992 Submodel: GT

Helpful (7) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Full Day

October 31, 2018

Don't fear the Gear!!

This should be one of the fisrt mods done on any car. My Pony has being awaked!. Totally different car. In conjuntion with a 3000 stall converter snaps on every shift.. And without OD, its another experience. Love driving my car.

DennisD

Year: 2006 Submodel: GT

Helpful (11) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $100-$250

October 30, 2018

Whole new car!

4.10 gears made my 00 Mustang GT feel like a completely different car. 10/10 mod everyone needs.

BrandonH

Year: 2000 Submodel: GT

Helpful (9) Thanks for your input!
- Performance Gain 4
  4
- Fit 5
  5
5/5

Installation Time: Full Day

October 28, 2018

Great product

Must include this in your new gear install excellent priced as a kit with the gears I bought and why not replace all you bearing when it already apart easy dessision to make. High quality parts at a great price

JonD

Year: 2002 Submodel: GT

Helpful (9) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Afternoon

October 25, 2018

great for around town driver

if your looking for more butt dyno power these will do the job. be warned that highway rpms are really high and if you daily 70mph plus wih a manual trans you may be unhappy with how high it has to be in the rpm range.

ChristopherW

Year: 2009 Submodel: GT

Helpful (8) Thanks for your input!
- Performance Gain 4
  4
- Fit 5
  5
5/5

Installation Time: Afternoon

August 24, 2018

4.10

Do not fear the gear!! Were I live highway speed limits are 55 to 70mph.... But when you punch the pedal it's a game changer... It made my stock 97gt with the pi swap and cams and some mild bolt on and it will wake it up... I recently put a serious quick whooping 0n a 2010 rt challenger from a dig.. They make 450hp stock.. So thats night and day for you... You will be in love... Now I'm going boosted so I might be going 6speed but till then I'm in love with the 4.10

BobbyB

Year: 1997 Submodel: GT

Helpful (11) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Afternoon

June 15, 2018

So Beyond happy I went 4:10

Most amazing decision ever to make instead of 3:73 gears and I’m heavily modified and it’s so worth the money and was such an easy painless install by my mechanic thanks american muscle.

Anthony

Year: 2008 Submodel: GT

Helpful (15) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Afternoon

April 14, 2018

4.10 the best

Installation was a breeze. Took my mechanic half day to finish but he did a great job. No vibrations at all and works great. Drives like a whole new car and good power

MustangDubai

Year: 2004 Submodel: GT

Helpful (9) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $250-$500

April 07, 2018

Torque 2005 GT

Wow like a different car! Much more power in all gears, fifth is actually a usable gear now. And the car still has good top speed. Had my garage install these along with new axel seals. My mechanic said the kit was complete and fitment perfect.

JT

Year: 2005 Submodel: GT

Helpful (10) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $250-$500

January 12, 2018

What a change in my manual!!

Had the car for 5 years and started looking into gears about a year ago or so. Can't believe how much different it feels. 1st gear is still usuable, I just shift higher than I use to and I can run through 3rd and into 4th without hitting speeds I don't want to. I have rarely ever taken the revs above 5k and rarely above 4k in the past, now I hit above 4k daily and love it. No gear whine so far so shop did a great job. Gas mileage looks to have dropped about 2mpg but I shift higher than before and have been getting on it more so it may have only been 1mpg if I drove the exact same...which I won't do now.

Shredder

Year: 2003 Submodel: GT

Helpful (12) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Shop Install

Installation Cost: $100-$250

November 17, 2017

07 Gt500

Nice kit came with everything had a shop install it for me $230.00. The 4:10 are a little much for a gt500 with stock tire size. Switched to 29inch tall tires and car is a beast!

MatthewH

Year: 2007 Submodel: GT500

Helpful (12) Thanks for your input!
- Performance Gain 4
  4
- Fit 5
  5
5/5
November 13, 2017

4.10 gears and loving it

Had a friend install them with no issues love the new feel really wakes the car up

RobertH

Year: 2004 Submodel: GT

Helpful (13) Thanks for your input!
- Performance Gain 3
  3
- Fit 5
  5
5/5

Installation Time: Full Day

November 08, 2017

410 gears

Best thing I've done to my car!! I waited a month to see if the 373 kit would be back in stock and got impatient so I got the 410s. Man am I glad I did. My car is 10× more fun to drive. I cannot wait to drive my car everyday. I drive on the highway for 3 hours a day and its not bad. I'm around 2400 at 70 and it sounds good. Do not hesitate to get the 410s!!! You will love it and will not regret it. Thanks AM!!!

KeithR

Year: 2003 Submodel: GT

Helpful (13) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Full Day

November 05, 2017

No regrets

First gear is a waste, but the the Oomph you get in 2nd, 3rd and 4th is well worth it. By far the best upgrade I've done to my car (I'm also running the Bama Racing tune).

ArmandoH

Year: 2009 Submodel: GT

Helpful (10) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5

Ford Performance 4.10 Gears and Install Kit (86-09 V8)

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