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Ford Racing 3.55 Gears and Install Kit (10-14 V8; 11-14 V6)

11 Reviews
Our Price

$279.99

(kit)
  • Item #100572
  • MPN# 100572

  • Market Price $359.99
  • You Save 22% ($80.00)
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Features
  • Money Saving Combo Kit
  • Ford Racing 3.55 Gears - 8.8"
  • Ford 8.8" Rear Gear Pinion Bearing
  • Motive 8.8" Rear End Installation and Bearing Kit
  • 1 bottle of Ford Racing Friction Modifier
  • 2 quarts of Royal Purple Max Gear 75w140 Gear Oil
  • Fits 2005-2014 V8 and 2011-2014 V6 Mustangs with 8.8" solid rear axle
Description
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, inner rear gear pinion bearing, 1 bottle of Friction Modifier, 2 bottles of 75w140 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 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 3.55 Rear Gear and Installation Kit is designed for use with 8.8in solid rear axle equipped Mustangs, including the 2005-2014 GT, Bullitt, BOSS, Shelby GT500 and 2011-2014 V6 models.

Application Note: Does not fit 2013 Boss or 2013-2014 Shelby GT500 Mustangs with axle codes S-215-D and S-219-D.

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: 2010 2011 2012 2013 2014 Details

Won't fit? Add an exception

What's in the Box
  • (1) Ring gear
  • (1) Pinion gear
  • (1) Rear Gear Pinion Bearing
  • (1) 3.8 fluid oz bottle of Friction Modifier
  • (2) one quart bottle of Royal Purple Max Gear 75w140 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
Will it fit my Mustang?
  • GT - 10, 11, 12, 13, 14
  • GT500 - 10, 11, 12, 13, 14
  • V6 - 11, 12, 13, 14
  • Boss 302 - 12, 13

Does not fit 2013 Boss or 2013-2014 Shelby GT500 Mustangs with axle codes S-215-D and S-219-D.

Most Helpful Reviews

5/5
THE Best bang for your buck mod you can do.

I had my these gears installed by a local shop, and after cruising around on them for a week or so now, I can't think of a better way to have spent my money. When combined with a new Bama tune, I was shocked ...

Read More
Helpful (4)

5/5
3.55's on a 2014 V6

Take into consideration that I did this mod along with a Steeda CAI and a SCT 91 tune. Talk about a different vehicle, wow. If you're considering any mod, definitely go with this combo. It really makes ...

Read More
Helpful (2)

Read All 11 Reviews
Overall Rating 4.5 out of 5 stars

Customer Photos

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2 Questions / 1 Answers

Ask a Question

Do you have to buy the trak loc rebuild kit?

DRush Year: 2012 Model: V6

  • You don't have to, especially on a newer car with lower mileage. But it is highly recommended and can help increase the overall performance gained with the gear kit.

    13green Year: 2013 Model: V6

    Good Answer (0)

New 2010+ pinion bearing included? I am looking for 3.55 gears for my 2011 V6. Next to this complete kit It says "(10-14 V8; 11-14 V6)". So is the new pinion bearing needed for all 2010+ Mustangs included?

Lestat1795 Year: 2011 Model: V6

Answer This Question I need this answered (0) (0)

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Customer Reviews (11) Write a Review

Overall Rating 4.5

out of 5 stars

Installation Time:Shop Install

Installation Cost:$250-$500

  • Performance Gain 4.636364 4.6
  • Fit 4.636364 4.6
  • Bang For Your Buck 4.818182 4.8



  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    December 17, 2013

    THE Best bang for your buck mod you can do.

    I had my these gears installed by a local shop, and after cruising around on them for a week or so now, I can't think of a better way to have spent my money. When combined with a new Bama tune, I was shocked with just how much quicker the car pulls over the stock 2.73 gears that I swapped out. Acceleration is smooth and strong all the way to the now much-quicker-approached redline. Whereas the car barely wanted to squeak the tires on take-off before (slushbox), I now have no problems whatsoever in wasting rubber on launches and on the 1-2 shift! Now, for the other main concerns most people have with new gears: noise and fuel consumption increases due to higher revs. With 3.55 gears and stock 18" tires, I'm now running at about 2200rpm in 6th gear at 70mph, as opposed to 1750ish RPM at 70 on the 2.73's (again, with the slushbox). With my Dynomax catback, I definitely do hear more "noise" at highway speed, but honestly, that's what I wanted when I had the exhaust put on. I don't hear any sort of annoying "drone" unless the engine is under load at highway speeds, such as crawling up an incline. For basic cruising around, it sounds just fine. As for the impact to fuel economy, the jury is still out on that one as I have yet to run through a full tank. My trip meter is telling me I'm averaging right at 20mpg currently as opposed to hovering around 22ish like normal, but it's never been entirely accurate. Of course your mileage may vary, as the bulk of my driving is off highways, commuting to and from work on roads that vary from 40-55mph with traffic. That, and I've been out having fun with my new-found acceleration instead of driving like a normal person! In conclusion to this long-winded review, if you've grown tired of the ridiculously tall factory gearing breaking any and all speed limits before leaving 2nd gear, this is a no-brainer mod. It's not an easy mod (my shop ended up trying 4 times before getting everything perfect), but it's one of the best things you can do to your Mustang.

    t0ad

    Year: 2013 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 WV

    Helpful (4) (0)

  • 5/5

    Installation Time: Full Day

    October 03, 2014

    3.55's on a 2014 V6

    Take into consideration that I did this mod along with a Steeda CAI and a SCT 91 tune. Talk about a different vehicle, wow. If you're considering any mod, definitely go with this combo. It really makes it feel like you have a different vehicle. Very quick, better shift points and a whole lotto fun. I was contemplating 3.55's or 3.73's, obviously went with the 3.55's and couldn't be happier. Do a fair amount of highway driving and my automatic runs around 2100 rpm's at 65 just for a reference for anybody considering this mod. Also bought the install kit, which honestly I wouldn't pursue. The gear oil included was the wrong weight, and since the car was new, really didn't need all the extra bearings/seals included in the kit. Had it installed at a garage for about $400/ actually a little less than that since the mechanic bought back the kit oil from me. All in all, if you can afford a couple mods, wait for exhaust and go with gears/ CAI and a tune - you'll thank me for it, and you'll think you have a new mustang!

    RichK

    Year: 2014 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 10+ Alamogordo, NM

    Helpful (2) (0)

  • 3/5

    Installation Time: Full Day

    November 02, 2014

    3.55 gears

    Decent quality kit, but I believe Ford Racing offers much better quality, so I would recommend buying all Ford Racing parts and forget the kit. My biggest disappointment is with the shim assortment. You will receive numerous shims of the same size so there is no way to precisely adjust your contact pattern without buying additional shims.

    My2014Stang

    Year: 2014 Model: V6

    Helpful (1) (0)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    October 27, 2014

    gear noise

    my mechanic warned me against this brand (he recommended Richmond or Motive) due to noise, but since I didn't see very many complaints about this, I went ahead with the purchase. I'm hoping that as these break-in, the whirring will diminish -- it seems to be most noticeable in the 1200 to 1800 RPM range. I also have a MagnaFlow exhaust, so the noise might still be there at higher revs, but the exhaust note drowns out everything else. my '11 GT had 3.15's, and these were a noticeable improvement, without too much higher RPM's during cruising.

    JG183

    Year: 2011 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Edgewater, NJ, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    July 27, 2014

    Poor man's turbo

    Definitely could feel the increase in torque after installing the 3.55 gears, only a slight decrease in mileage at highway speeds, around town I get better mileage now. Be careful on the install, I have some bad whine between 50-65 MPH which I'm going to bring my car back into the shop to have fixed. Aside from that, wonderful product that's definitely worth the money.

    13green

    Year: 2013 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 16, 2014

    3:55 or 3:79

    I was trying to decide between the 3:55 or 3:79 gear kits. After a lot of extensive research on every forum I could find, I finally settled on the 3:55 gear and I'm very happy with my decision. I think this is the perfect setup for a daily driver with the 6 speed manual trans and the 3.7L V6. First gear is very short if you don't wind it out, but it is still useful. Also expect to actually have a need to use 6th gear after install. If I had an automatic V6, or a GT with a 6- speed (the GT is geared slightly differently- eg. first gear is not as low. It's 4.2:1 on the V6 vs 3.6:1 on the GT both with the 6speed manual), or if I spent more time on the drag strip than the street (mine will probably never make it to the track) I think 3:79 gears would have been my choice. But IMHO for the 3.7 L with the 6 speed manual trans as a daily driver 3:55 gears are the perfect setup and the best of both worlds (all out acceleration vs drivability as a daily driver). I also plan on adding forced induction, probably with a turbocharger, in the future. So I think 3:79 gears would be too steep for my overall build plan. In fact, had I had factory 3:31 gears instead of the 2:79 highway commuter gear setup I probably would have left it alone. On a side note I do 90-95% city driving and my mpg actually went up 1-2mpg. Overall the gears and kit themselves are top quality pieces. No howl or wine on mine, but that has more to do with install than parts. Make sure you find a shop you trust that will let you bring your own parts before you buy everything. At least in my area it was no easy task, but we'll worth my efforts. Because I saved hundreds by getting my parts from AM instead of letting the mechanic get them. Plus I also know exactly what he used and know that I have true ford racing parts.

    DcH5

    Year: 2014 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Corpus Christi, TX, USA

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    March 21, 2014

    Instant sports car... fixed the weakest point in a 2014 V6 Mustang!

    No whine at all, just like the Ford factory 2.73 gears quality, of course, it's by Ford! Local Knoxville Performance Shop did a fine job, took 3 hours. Coupled with a Bama tune and Borla mufflers, my V6-Automatic is about half way there. Next up: lowering springs, X-pipes, CAI and Throttle body will complete the internal modifications... 1970 Boss 302 vintage power in an economical 229 cu. in. V6!

    Henry99

    Year: 2014 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Knoxville, TN

    Helpful (2) (1)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    January 25, 2014

    Best Bang for buck

    Install went smooth no whine at all. Night and Day difference going from 2.73s to 3.55s. Highly recommend.

    Ksweezy

    Year: 2012 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (2) (1)

  • 5/5

    Installation Time: Shop Install

    June 15, 2015

    Better performance

    My v6 automatic had stock 2:73 gears. Great for 32 mpg but nothing else. I needed more power to the road a lower speeds when driving thu the twisties. Had them professionally installed for $350.00 . I can do most thing on a car but wouldn't think of putting gears in myself. Well worth the 350 install price.

    Frank

    Year: 2013 Model: V6 'Stangs I have owned: 1 easley, SC

    Helpful (0) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    June 14, 2015

    New gears, way better than stock!

    I had a local shop put the gears in while I was at work. It took them about half a day and the install was $408. He recommended a break in period of 300 miles. Then when they were ready I hit the gas and noticed a big improvement over stock. I had to wait a few days for a new tune to fix my speedometer but I just used my gps to get by. My car now runs about 2100 rpms at 70 so I don't think my gas mileage will change much. Now that I have the shorty headers, throttle body, CAI, Bama tune, and gears it's a LOT more fun to drive!

    Optimized

    Year: 2012 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1 Mount Pleasant, WI

    Helpful (0) (0)

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