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 19 Answers

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Item 100577
MPN# 100577

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

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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 (15) Customer Reviews (100+) Questions (32) & Answers (19)

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

CA Residents: Warning: California's Proposition 65

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 (32)

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

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)

so I am thinking about putting 4.10s in my 06 GT automatic. The only thing is that I travel a lot so how would these affect my performance on the highway? How much gas mileage will I be sacrificing? 1 answer

With the Ford Performance 4.10 Gears and Install Kit, at 65mph, you would expect to see just over 2300RPM, and at 75mph, around 2700RPM. Unfortunately there are a number of additional factors that would play into fuel economy to give any type of numbers for fuel economy changes with these gears.

Helpful (0)

Hi. Was looking this kit up online about a month ago and it was stated you were out of stock. Then received an e-mail last week saying they were now in stock. But, presently the ad states it's out of stock. Which is it ? Also, what brand of gears and bearings come with this assembly ? Thanks. HT 1 answer

Unfortunately the Ford Performance 4.10 Gears and Install Kit is still currently out of stock with an estimated time of arrival of 3-4 weeks. As for the bearing kit, that is manufactured from Motive and the ring gear and pinions are manufactured by Ford.

Helpful (0)

So I see it says 86-09 V8 but I see similar kits online that are compatible with v6 and v8. So is this just for V8s or can it be installed on a v6. 1 answer

This Ford Performance 4.10 Gears and Install Kit is only intended to be installed on the rear end of 86'-09' V8 Mustangs.

Helpful (0)

Will it work with a automatic what do u need to do and will the 4.10 gears work with a stock 2008 mustang gt 1 answer

Yes, this will work with an automatic mustang, this is a complete kit with everything you need. A tuner would also be recommended to correct the speedometer as the increased gear size will change your speedometer reading by up to 10-15 mph.

Helpful (0)

Will is work with a stock mustang gt and then put the 4.10 gear 1 answer

The Ford Performance 4.10 Gears and Install Kit will work with a stock 1986-2009 V8 Mustang.

Helpful (0)

Out of stock?? About 2 weeks... Approximately for when will be this item in stock?? 1 answer

Unfortunately we do not have an ETA on the Ford Performance 4.10 Gears and Install Kit at this time.

Helpful (0)

I have a 1992 fox body, 5 speed car. Just did 4.10's, what speedo gear do I need to fix the speedo? 1 answer

The OEM T5 Transmission has a 8 tooth drive gear, and many aftermarket T5's prior to 1993 used a 7 tooth drive gear. Unfortunately, the drive gear for the 8 tooth drive geared transmission, there are not any speedometer gears. If you have the 7 toothed drive gear, your vehicle would require a 23 tooth speedometer gear, item 53680. http://www.americanmuscle.com/speedo-gear-19tooth-manual.html

Helpful (0)

People Who Bought This Item Also Bought

Customer Reviews (100+) Write a Review

Overall Rating

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

Performance Gain 4.788462 4.8
Fit 4.903846 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

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 (0) 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 (8) 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 (2) 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 (2) 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 (4) 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 (3) 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 (4) 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 (3) 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 (2) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5

Installation Time: Weekend

October 31, 2017

Best Bang for the Buck ... Period!

I used this kit to swap my 3.27's to 4.10's and did the work myself. The only part I needed a shop for for pressing on and off the pinion and carrier bearings (I'm not a tech by any standards). I had heard that if you use the factory shims (in the same orientation) that pinion depth, backlash and pattern would probably be good; and they were perfect! All-told it took me a bit longer than listed because I pulled the whole axle, did the axle bearings, painted everything; etc. In my opinion; the best mod for the money! This turned my trotting Vortech 2V pony into a bucking ... well ... Mustang. Thanks again AM, wow ... just wow!

DanielD

Year: 2003 Submodel: GT

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

Installation Time: Weekend

October 23, 2017

4:10 gears

The best mod you can do for your 4.6 awesome response like night and day difference.well worth the money

EdwardM

Year: 2002 Submodel: GT

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

Installation Time: Full Day

October 20, 2017

4.10 gears awesome

I'm ripping through gears now better throttle response and take off

JoshuaL

Year: 1996 Submodel: GT

Helpful (3) Thanks for your input!
- Performance Gain 4
  4
- Fit 5
  5
5/5

Installation Time: Full Day

September 30, 2017

Zero to fun like a 'stang should.

Used these to replace a set of 3.55 in an '93 LX getting set up for auto-cross. Had everything needed. Use RTV instead of the gasket. Bears are great, lube is top notch.

Pheagey

Year: 1993 Submodel: LX

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

Installation Time: Afternoon

September 03, 2017

Really wakes up the 4.6

This is a must I love the change in performance with the mustang. It is a little different driving city but when you really let the car open up it is a noticeable difference. A must have for the 4.6

wcc7890

Year: 2007 Submodel: GT

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

Installation Time: Shop Install

Installation Cost: $500-$1000

August 25, 2017

Perfect performance and semi daily gears

For the longest time I was debating between 4.10s and 3.73s. I wanted to extra kick 4.10s would give but was worried it would effect drivability of the car around town - I'm not really a daily and not really a weekend warrior - somewhere in between. I was thoroughly impressed by these gears. You're pretty much always in the power band and the car is far more fun to drive than before. It goes without saying you will sit at some higher RPMs at highway speeds, but it hasn't totally killed my mileage as I've slipped from roughly 17 MPG to 15.7 MPG. A difference, sure, but not as bad as it could be. If you're on the fence about what gears to get, trust me and go 4.10 - you've won't be sorry.

YJeter2

Year: 2006 Submodel: GT

Helpful (4) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
5/5
August 16, 2017

Best bang for buck

By far the best bang for your buck, had a buddy put them in for me for around 200$. Made my 97 cobra a lot more fun to drive and not such a dog with the stock 3:27's. Honestly makes daily driving better (for me atleast) getting in the power band quicker. Thanks AM!

Gearman19

Year: 1997 Submodel: Cobra

Helpful (3) Thanks for your input!
- Performance Gain 5
  5
- Fit 4
  4
5/5
August 13, 2017

**** Serious Fun ****

I really labored over 3.73 or 4.10 and everything I was reading seemed like quite a few people that picked the 3.73 wished they had gone with the 4.10. Granted, you lose top end but I'm rarely in that neighborhood and the low end is way too much fun. The other thing I was worried about was noise in the cabin on the freeway at speed, pppfffttt... no worries, even with the windows down. That being said I still have stock exhaust ;), soon to change. I found a shop for the install and they struggled with it but after bringing it back to get it right they did a great job. All in all, 0 regret

RickJ

Year: 2006 Submodel: GT

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

Installation Time: Full Day

July 05, 2017

4.10 gears

huge difference with the gears a must have its a long install but worth the time

John

Year: 2003 Submodel: GT

Helpful (3) Thanks for your input!
- Performance Gain 5
  5
- Fit 5
  5
4/5

Installation Time: Full Day

July 04, 2017

stang it!

perfect fit! LMR has nailed the install of this item. The only thing i would change is the install kit, dont need the nut crush collar or all those shims but you do need wheel bearings and seals to do the job right and i feel that these items should have been part of the kit?

Bill

Year: 2007 Submodel: GT

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

Installation Time: Afternoon

July 02, 2017

Woke up the rear

Way better than stock. looking at 2.5k ish when doing 70-75mph in 5th but the overall driving experience has just gone way up.

TravisE

Year: 2004 Submodel: GT

Helpful (3) 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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$259.99

+$112.99