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Ford Racing 3.73 Gears and BAMA X4 Tuner (99-04 V8)

100+ Reviews
Our Price

$619.99

  • Item #101657
  • Market Price $699.99
  • You Save 11% ($80.00)
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Features
  • Money Saving Combo Kit
  • Bama SF4/X4 Tuner with 3 Custom Tunes
  • Free Tunes for Life
  • Ford Racing 3.73 Gears - 8.8"
  • Motive Gears 8.8" Rear End Installation and Bearing Kit
  • 2 Quarts Royal Purple Max Gear 75w90 Gear Oil
  • 1 Quart of Ford Racing Friction Modifier
  • Includes datalog reviews to ensure your vehicle is fully optimized
  • Free Personalized ID Plaque (Pictured Above)
  • Fits 1999-2004 V8 Mustangs
Description
Bama Performance

The Gears
The Gears

Improve ET's and Low End Torque. Installing a set of steeper rear gears is a great way to get more low end grunt off the line and lower your ET's at the same time. Ford Racing Mustang ring and pinion gears feature a super strong forged construction, CNC cut & lapped gear teeth, and a black oxide finish to resist corrosion making them perfect for street, road, or race use. More info about these gears - Here

The Tuner
The Tuner

Power. Performance. Personalized. The SCT Power Flash Tuner features Bama Performance custom tunes that are written specifically for your Mustang. Our tunes are based on a 19 point questionnaire to deliver the most power and performance possible for your Mustang’s modifications. All Bama Performance tunes are tested and proven on our very own in-house Dynojet 224xLC Chassis Dyno. More info about this tuner - Here

The Combo
The Combo
  • More horsepower and torque
  • Better throttle response
  • Enhances existing modifications
  • Custom Dyno proven tunes
  • Free Tunes for Life
  • Free personalized ID plaque


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.

**NOTE: Programming custom tunes may take 2-3 business days plus applicable shipping time. We recommend ordering other products separately to avoid delay. Some heavily modified cars are not tunable with a mail order tune. Click for details. Membership in the Tunes for Life program is is valid for as long as you own the car that was originally tuned and is non-transferrable.

Fitment: 1999 2000 2001 2002 2003 2004 Details

What's in the Box
  • (1) SF4/X4 Power Flash Tuner
  • (1) One USB PC Interface Cable
  • Ford Racing 3.73 Gears
  • Motive Gears 8.8" Rear End Installation and Bearing Kit
  • (2) quarts Royal Purple Max Gear 75w90 Gear Oil
  • 1 quart of Ford Racing Friction Modifier
  • Free Tunes For Life
Installation Info
Tech Specs
Bama Custom Tuning at AmericanMuscle. Power. Performance. Personalized. Proven
Ordering a Custom Tune?Whether it's a new mod or just an octane change on your existing tunes, our Bama Performance calibrators have got you covered in a few easy steps:
  1. Buy this Tuner & Submit your Mustang's Info
  2. A Bama Performance Calibrator writes custom tunes just for your Mustang & Mods
  3. Load 'em on your Mustang and GO!
  4. As you add new mods, Bama will update your tune files for FREE!
That's right, Free Tunes for Life!

More Power. Do you want the ultimate power package for your Mustang? Well look no further, because it has arrived. AmericanMuscle introduces the kit that will launch you into quarter mile times that you have never dreamed of possible; designed to give the best possible performance upgrade for your car, without having to empty your wallet.

Kit includes: (click on each item for full product description)

Increased HP and torque. From the factory, the manufacturer programs their vehicles to cater to the needs of the daily driver, not the performance enthusiast. After loading the custom Bama Tune on a vehicle, even a bone stock, unmodified Mustang will realize noticeable gains in HP, Torque, and Fuel Economy.

Increase your mod's potential. Factory computer settings are calibrated for the original factory components. When making performance modifications, you need to recalibrate the vehicle's computer to realize the full potential that these modifications can achieve.

Free tunes for life! Every customer that purchases a tuner is enrolled in the "Free tunes for life" program. Any time that you make additional mods to your vehicle, our team of SCT certified Bama Custom Tuners will create new tunes for you.

Custom Bama Tunes specific to your vehicle. When you order a tuner, you aren't just getting a tuner - you are getting the tuner and 3 dyno-tested custom Bama tunes:

  • Street (87-93 octane) - the street tune is designed as a daily driver program that focuses in on increasing mid-range power. It does give up a few HP at higher RPMs, but that's why there is a Performance file. Automatic vehicles are further enhanced by making adjustments to the transmission's shift points and firmness.
  • Performance (87-93 octane) - The Performance program is designed to add power at 3000 RPMs and higher, focusing more on the top end horsepower and all out performance driving. Timing, fuel and throttle response settings are slightly more aggressive than the street tune. This is a great track tune but also works well for daily drivers that are looking for a little more "get up and go" than the street tune. The automatic transmission settings are the same as in the street tune.
  • Race (91 - 93 octane) - The race tune will ensure the largest increase in vehicle performance. Using the highest grade of fuel available in your area is mandatory. This file is designed for "Race only Use" as the timing, fuel, and throttle response settings are very aggressive. in fact, the adjustments are so aggressive, that we do not recommend it for daily driving as it may cause your vehicle to try to jump out from a stop and easily spin the tires. Finally, with the automatics, we implement entirely new shift points and firmness settings to further enhance the all-out performance of the vehicle.

Nitrous (91-unleaded race gas) - Our nitrous option can be added to any of our previously mentioned tune options, but only for 91-octane unleaded fuel.

Easy to load; easy to restore. Not only are the custom tunes easy to load on your vehicle, it is just as easy to restore your factory settings. When you load your custom tune on the vehicle, the tuner automatically stores your vehicle's factory settings. To return the vehicle to its factory settings, just plug the tuner back in, select the option to restore the factory settings, and you're done.

SCT SF4/X4 Power Flash Tuner Features:

  • The SF4/X4 by SCT is the newest replacement for the popular SF3/X3
  • Reads / Clears DTC Trouble Codes
  • On screen data logging and monitoring
  • Full color LCD display with auto dim feature
  • Built-in WiFi for easy updates
  • PC/Windows compatible
  • Custom tuning applications for 1999-2004 GT, Bullitt, Mach 1 and SVT Cobra Mustangs
  • Click for Instructions on Loading Custom Tunes to your Mustang.

Approximate RPM for 1999-2004 GT


Manual
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 3888 5443 6998      
2 2301 3221 4141 5061 5981 6902
3 1518 2126 2733 3340 3948 4555
4 1150 1610 2070 2531 2991 3451
5 782 1095 1480 1721 2034 2347


Automatic
Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
1 3267 4573 5880      
2 1783 2496 3209 3922 4636 5349
3 1150 1610 2070 2531 2991 3451
4 805 1127 1449 1771 2093 2416
Will it fit my Mustang?
  • Bullitt - 01
  • Mach 1 - 03, 04
  • Cobra - 99, 01, 03, 04
  • GT - 99, 00, 01, 02, 03, 04

Fits Mustangs equipped with a 8.8" rear end only

Most Helpful Reviews

5/5
Needed this

My cobra came with a chip installed by previous owner. Not sure what tune details were on the vehicle. Installed the bama tune night and day/difference!!!

Helpful (1)

5/5
Great drivability

Tore up a 3.90 ratio set and put this instead! In my opinion felt better! Did not lose the top end like before!

Helpful (4)

Read All 16 Reviews
Overall Rating 4.9 out of 5 stars

Customer Photos

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21 Questions / 10 Answers

Ask a Question

Whats the difference? What is the difference between this kit and the kit for 35 dollars?

ncstang06

  • This kit comes complete with everything you need for a full rebuild: bearings, shims, crush sleeve, etc... The $35 kit is a basic kit that is the same as the more expensive version, but there are no bearings included. We highly recommend getting the complete kit and replacing all your bearings and shims at the same time to prevent any costly problems down the road. It's better to replace them all at once, rather than having to tear the car apart again just for a bearing gone bad.

    LisaS

    Good Answer (5) (0)

Show 2 more answers Question Resolved

4.10 gears installation kit I recently purchased the 4.10 gears for my 2006 mustang GT and I'm not sure which installation kit I should buy !! Is this the right one !?!

andres

  • Certainly is the correct kit! It will come with everything you need for a complete swap during your 4.10 gear install! Includes all the bearings, shims and seals necessary!

    LisaS

    Good Answer (3) (0)

Show 3 more answers Question Resolved

4.10 Gears/Shift Points on an Auto i had 4.10 gears put in, i want to know does the tune itself fix the spedometer? and also does my custom tune's change the shift points change for the gears ? or do i have to go about changing the shift points on my own

BlackPony2001

  • Within the tune, we will correct the shift points when notified of a gear change such as 4.10's and the speedometer will be fixed as well.

    LisaS

    Good Answer (2) (0)

Show 2 more answers Question Resolved

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Customer Reviews (100+) Write a Review

Overall Rating 4.9

out of 5 stars

  • Performance Gain 4.8125 4.8
  • Seat Of Your Pants Feel 4.6875 4.7
  • Ease Of Use 4.875 4.9
  • Bang For Your Buck 4.5 4.5
  • Preferred Tune: Performance



  • 5/5

    February 07, 2016

    Review from Bama X4/SF4 Power Flash Tuner w/ 2 Custom Tunes (03-04 Cobra)

    Needed this

    My cobra came with a chip installed by previous owner. Not sure what tune details were on the vehicle. Installed the bama tune night and day/difference!!!

    s281joel

    Year: 2003 Model: Cobra 'Stangs I have owned: 4 watsonville, CA

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    December 22, 2012

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    3.73 for my 98 gt

    Was very impressed with the difference it made with launching the car and acceleration through the first 2 gears.. Especially over the stock 2.73 gear. I put this on a stock 98 gt paired with a great set of tires and I was now able to beat my friends fox with heads cams out of the whole! Then he eventually pulled me in third. Great bang for your buck...

    Broche

    Year: 1998 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Canada

    Helpful (1) (0)

  • 5/5

    August 15, 2009

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    Great drivability

    Tore up a 3.90 ratio set and put this instead! In my opinion felt better! Did not lose the top end like before!

    Josh Hastings

    Year: 1990

    Helpful (4) (0)

  • 4/5

    November 21, 2007

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    respectable product

    My first mod, and I can feel the difference.. and not to mention a lot cheaper than other web sites!!!!

    rickster

    Helpful (3) (0)

  • 5/5

    March 03, 2010

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    Everyone should get gears!

    I put these and a new diff in my 94 GT... otherwise basically stock... and WOW it really does make a difference... if you are thinking about it... DO IT! you will not regret it!

    Dave Anderson

    Year: 1994 Model: GT

    Helpful (7) (1)

  • 5/5

    February 15, 2010

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    !!!!!! HOLY SH*T !!!!!!!!

    Put on hot rod cams and had to change my gears for the cmas... since its my daily i put in the 3.73's...... from 3.55... OMG what a difference.... its like my car went from ... wow that prety fast to..."HLY F*CKIN SH#T" best performance mod fo the buck hands down!!!!!

    John

    Helpful (6) (2)

  • 5/5

    January 09, 2010

    Review from Motive Rear End Installation and Bearing Kit - 8.8 in. (86-14 V8; 11-14 V6)

    Pay for it now

    Even if you send the car to the shop to get it rebuild, you are much better off buying this kit then paying for parts. I was quoted a $900 installation + parts for redoing my rear gears. So I purchased the parts and lube here in American Muscle and only paid for labor which was only $360, so I ended up saving $275.

    R. Hidalgo

    Year: 1990

    Helpful (19) (0)

  • 5/5

    October 13, 2010

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    Good buy for any guy (or gal)

    Bought gears, install kit, and girdle a few weeks ago and had them professionally installed. Very happy with the gears and how well my car pulls now. If you want to make your car a little quicker without major cash, these gears are an excellent choice.

    Tracy

    Driving Style: Daily Driver

    Helpful (17) (1)

  • 5/5

    April 09, 2010

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    Can you say IMPROVEMEMT?

    Installed on my 03 GT. Install price was $200 trust me if you dont know what you are doing with the shims and setting the backlash have a pro install these, but lauch is much improved 2nd gear is nasty. Went to the local strip with is an 1/8 mile track and ran 9 flat with the help of the AM CAI. Killed a few Comaros in the process and isn't that what we are all after? Buy it stop reading! GO!

    Matt D

    Year: 2003 Model: GT

    Helpful (21) (4)

  • 5/5

    April 05, 2010

    Review from Ford Racing 3.73 Gears (86-14 V8; 11-14 V6)

    04GT 3.73gears

    DONT FEAR THE GEAR! The perfect gear for a street car. Decent RPMs on the highway and crazy excelleration through first 3gears. Have them installed by an experiance tech who has done these before. Its hard to keep my foot out of it now!

    Dickie Ayer

    Year: 2004 Model: GT

    Helpful (15) (1)

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