1986-09 Ford Racing Mustang 3.73 Gears Kit for 8.8 by Ford Racing

Mustang Ford Racing 3.73 Gears Kit for 8.8" Rear End (86-09)


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  • Ford Racing Mustang 3.73 8.8" Ratio Rear End Gear Kit (86-09)
Mustang Ford Racing 3.73 Gears Kit for 8.8" Rear End (86-09)

This 86-09 Mustang 3.73 gear kit includes everything needed to complete your gear install!

Item #LRS-4209FRB-K

Your Price: $255.99

Market Price:$259.99
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Benefits

  • Improved Acceleration
  • Eliminates Guesswork
  • Everything You Need To Do The Job Right

Features

  • Royal Purple Gear Oil Virtually Eliminates Wear
  • Friction Modifier Provides Smooth Operation & Prevents Chatter

What's in the Box

  • (1) 3.73 Ring Gear
  • (1) 3.73 Pinion Gear
  • (1) Master Bearing & Shim Kit
  • (1) Bottle Friction Modifier
  • (2) Bottles 75w90 Gear Oil

Product Description

3.73 Gears For Mustang Kit M-4209-F373N
These Mustang 3.73 gears are a great way to improve acceleration to make your Mustang faster! This kit fits 1986-2009 Mustangs with an 8.8" rear end and features a set of performance Ford Racing 3.73 gears, an FRPP M-4210-B2 bearing kit, a bottle of Ford Racing friction modifier, and 2 bottles of Royal Purple 75W90 gear oil. The bearing kit includes GT500 pinion bearing, carrier bearings, pinion seal, ring gear bolts, pinion nut, crush sleeve, shims, and marking compound. With this kit, you can get your gear installation done quickly and easily.

Ford Racing Friction Modifier
Ford Racing friction modifier is a specially formulated additive to provide smooth operation of clutch-type limited-slip differentials. 1 bottle of friction modifier is required when changing the gear oil in rear ends equipped with Ford traction-lock units.

Royal Purple Max-Gear Oil
Royal Purple Max-Gear gear oil is an ultra-tough automotive gear oil. It’s designed to maximize power and provide unsurpassed protection to heavily loaded gears. It makes gears run smoother, quieter, cooler and longer without overhauls. Max-Gear outperforms other gear oils because it combines the highest quality synthetic oils with Royal Purple’s proprietary Synslide additive technology.

Notes
Although the Royal Purple gear oil has friction modifier mixed in, it is still recommended that you use the bottle of Ford Racing friction modifier to supply your 8.8 rear end with the proper amount of modifier.

Kit includes:
1 Ford Racing Performance Parts 3.73:1 gearset
1 FRPP M-4210-B2 bearing kit (includes GT500 pinion bearing, carrier bearings, pinion seal, ring gear bolts, pinion nut, crush sleeve, shims, and marking compound)
1 bottle of Ford Racing Performance Parts Friction Modifier
2 bottles of Royal Purple 75W90 gear oil

Application
- Fits 1986-2009 Mustangs with 8.8" Rear Ends

**Although the Royal Purple gear oil contains friction modifier, we highly recommend including the Ford Racing friction modifier along with the gear oil when refilling your rear end.**

Due to Hazmat regulations, lubricants/fluids cannot be shipped to APO/FPO addresses.


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    Customer Photos (1)



    Product Reviews (37)


    4.9
    out of 5 stars
    5 stars
    37 reviews
    5 stars    34
    4 stars    2
    3 stars    1
    2 stars    0
    1 star    0

    100%
    OF CUSTOMERS
    RECOMMEND THIS PRODUCT
    37 of 37 REVIEWS
    RECOMMEND THIS PRODUCT
    37 of 37 REVIEWS


    5 Stars   Feels great
    By on 2/12/2014
    So far I'm only 100 miles into my break in period but there is no noise whatsoever. I'm still gonna take it easy for the first 500, but I can already tell that 5th gear pulls harder, but I haven't had a chance to compare them to my 1/4 mile times or acceleration yet....a second review to come.

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   3.27 to 3.73 upgrade on 92 Mustang Convertible with AOD
    By on 11/4/2014
    This complete Gear kit is the only way to go.

    I brought everything up to a local ring and pinion shop and 3 hours later I had new gears.

    I did a few heat cycles as recommended by Ford motor sport. I also accumulated about 400 miles before really getting on it.

    My 5.0 has the following:
    AFR185 heads with upgraded springs
    RPMII intake
    Comp Cam XE270HR-12
    1.6 Roller rockers
    Neutral balanced Forged Eagle 5.0 crank
    Scat forged 5.090 in. I-beam connecting rods
    Probe FPS Forged Pistons P2482F
    AOD with Fairbanks shift kit
    3000 Stall TCI Conv Lock/Up

    My car felt heavy and slightly lethargic with the stock 3.27 gears, it ran good and pulled strong up to 6200 rpm, but it just didn't get into the power band quick enough. With the 3.27 gears I could *barely* spin the tires when I nailed it from a stand still.

    The 3.73 Gears really did the trick, now the car can spin the tires from a 25mph roll and it runs and feels just like I was hoping it would.

    The way the car performs with the new gears is night and day, I am extremely pleased with the performance and the rear end is dead silent thanks to the new bearings and all the parts included in the kit, I guess the ring and pinion shop deserves some credit too :)


    1st to 2nd and 2nd to 3rd shifts easily chirps the tires with the new gears. The 2nd to 3rd chirps never happened with the 3.27 gears

    My car feels about 1000 lbs lighter with the new gears, it takes less throttle to get going and the rpms only changed by about 250 to 300 rpm.

    I also upgraded to the 23 tooth black speedo gear from late model, my Speedo now reads about 1.5 mph low instead of 10 mph too high.

    All in all I would say the 3,73 gear was the perfect upgrade for my Fox Body Mustang.


    Yes, I would recommend this item to a friend!


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    5 Stars   Love it
    By on 3/22/2014
    Installed this kit on my 89 gt. Way better then the stock 2.73 gears. Awsome. Very happy

    Yes, I would recommend this item to a friend!


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    5 Stars   The gear ratio Ford should have used
    By on 7/2/2014
    Like most people I bought this gear ratio to replace the 3.27 gears that came stock in my 1996 Cobra. Out of all the brand gears out there Ford Racing Gears are by far the best and easiest to install in an 8.8 rear end. This kit has all the bearings (the ones in my kit were made in the USA) and more than enough shims to do the job, all you need is an afternoon, a good press and a few hours to have in my opinion the best gear ratio for your Mustang.

    Yes, I would recommend this item to a friend!


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    5 Stars   A perfect match.
    By on 3/17/2014
    These FRPP 3.73 gears really make my pony gallop...

    Yes, I would recommend this item to a friend!


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    5 Stars   Great mod!
    By on 3/27/2014
    Bought the Ford racing 373 gear kit a coupleweeks ago and just got them installed today. It sure did wake my stang up! The PA valve body and gears on my aod sure feels a lot different than the stock 273's! I would definitely recommend these gears and valve body combo on your Fox body aod before any other mods! Got my sub frames to. Will install later. All my stuff arrived on time! Thanks Latemodel Restoration!!

    Yes, I would recommend this item to a friend!


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    5 Stars   Love the gears
    By on 8/15/2014
    I bought the last week and put them in as soon as I got them in the mail. And man do you feel the difference, compared to the stock gears! I recommend this part for mustang lovers that still drive highway every so often. I drive highway and it doesn't idle too high.. Over all love them! Thanks late model

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   LOVING IT!
    By on 4/1/2014
    I am loving driving my Mustang with the new gears. The power is awesome.

    Yes, I would recommend this item to a friend!


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    5 Stars   the best kit available
    By on 5/23/2014
    Comes with everything needed to install the gear correctly

    Yes, I would recommend this item to a friend!


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    5 Stars   Great product
    By on 3/29/2014
    Easy to install great quality product

    Yes, I would recommend this item to a friend!


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    5 Stars   3.73 gear kit
    By on 4/25/2014
    Purchased this kit two weeks ago, price was excellent and shipping was fast. Got them installed last week and what a difference it made compared to the stock 2.73 gears. Like a new car. Just ordered the tune up kit..

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   Perfect kit
    By on 9/29/2014
    Product shipped and arrived quickly, as usual. Everything was in the kit as described, it's really handy that there's 2 crush sleaves. Installs with a factory like fit.

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   3.73 Gears
    By on 1/13/2015
    Excellent product. Really woke up my mustang in terms of performance. Would recommend this to anyone for beginning mods to start off.

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   Awesome product
    By on 11/24/2014
    Image uploaded by JORGE L. I bought this about 2 weeks ago I am 100% satisfied with the product . Extremely fast shipping.

    Yes, I would recommend this item to a friend!


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    5 Stars   Geared to perfection
    By on 5/5/2014
    Recently purchased the 3:73 gear set. Turnkey job. All you add is labor. Thanks for packaging the product in this manner.



    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   Awsome product
    By on 9/11/2014
    Installed this kit on my 89. I loved it. Just bought a 94 mustang. And order the same set of gears for it.

    Yes, I would recommend this item to a friend!


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    5 Stars   Much better gearing
    By on 8/6/2014
    Perfect gears for my car. Much better bottom end and still good for the highway

    Yes, I would recommend this item to a friend!


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    5 Stars   Geat deal for everything
    By on 7/30/2014
    My mechanic wanted to know where i got a great deal on the kit and gears!

    Yes, I would recommend this item to a friend!


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    5 Stars   3.73 gears and install kit
    By on 4/30/2014
    Great technical support and product.
    Love the free shipping, too.

    Yes, I would recommend this item to a friend!


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    5 Stars   Perfect for my application
    By on 5/26/2015
    The gentleman who installed this for me said it was nice to have everything included so he didn't have to go searching for extra or missing parts. The install was uneventful (even though we discovered that my axle shafts are shot). He suggested I go thru several break-in cycles and then flush and drain at 500 miles. My car used to tach ~2,000 RPMs at 80 MPH, now its hitting that mark just above 60, but that's fine for what I do. We rarely take the car on long drives on the interstate; it's mainly used for going to car shows and running "stoplight-to-stoplight" down to the ice cream stand. And I can neither confirm nor deny that it goes to the the local dragstrip 3 or 4 times a year. I haven't made any hard pulls yet because I don't have that 500 miles on the odometer yet, but I can really feel the difference during moderate acceleration. I can't wait to try it on the track....I mean, if I were to put it on the track.

    Yes, I would recommend this item to a friend!


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    3 Stars   shims are too thick..
    By on 9/20/2014
    I'm no mechanic but I have some mechanical know how.. It has everything you need.. except shims don't go small enough to get the backlash to that magical 8 thousands to 12 thousands backlash.. I had to leaving it at 14... which is 2 thousands outside or recommended tolerances..( yes I used a dial indicator)... and may be the reason a bearing is about to fail :/ so its going to the mechanic to get fixed up right.. would I recommend it to a friend? if he was going to have a mechanic do it.... sure.

    Yes, I would recommend this item to a friend!


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    5 Stars   Ford racing gear kit
    By on 8/11/2014
    I searched around a month or two trying to find the best deal if Im going to shell out that kinda cash for a gear swap and came upon this deal and was floored but had my doubts. dug into a little more and you cant beat this. actual Ford racing gears not some cheap over seas products, install kit with American bearings, royal purple diff fluid and friction modifier. In my opinion best deal out there and in no way getting cheap inferior parts.

    Yes, I would recommend this item to a friend!


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    5 Stars   Wake a sleeping pony
    By on 5/30/2015
    Had this installed yesterday and really, really made a difference. So much acceleration compared to the stock 2:73s. I highly recommend this complete set. Everything is included that may be needed. I would recommend that LMR sell a ring kit and differential clutch rebuild kit all in one package. I bought both, but I think they go hand and hand. Boy did the clutch kit make a difference.

    Yes, I would recommend this item to a friend!


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    4 Stars   didnt install yet
    By on 2/26/2015
    Happy with everything I ordered but I was suprised how poorly all the parts were packaged for delivery. All boxes were broken open where you can see the parts inside. Only reason its getting 4 stars and not 5. Everything looks ok but time will tell when they get installed in the spring time

    Yes, I would recommend this item to a friend!


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    5 Stars   Excellent price and product
    By on 1/30/2015
    If doing a gear swap. Ford Racing is the only way to go. Everything you need in this kit. One advise though. Make sure you replace your races in the housing. The updated pinion bearing is totally different in size and won't match your current race.

    Yes, I would recommend this item to a friend!


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    4 Stars   Everything except one small piece.
    By on 11/3/2014
    Everything u need to rebuild your rear. However would've been nice if the cross pin was included. So now my car is still in the air until the pin comes in. Other than that all parts was there and fit well.

    Yes, I would recommend this item to a friend!


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    5 Stars   Great deal
    By on 7/30/2015
    Bought this set of gears for an upgrade for my 87 coupe. It was my first time installing gears so it took me a little while to get them acceptable. Great quality gears! Thanks LMR!

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   Great Product
    By on 12/15/2014
    LMR shipped this so fast and have yet to install them but the looks of the gears look so great along with the packaging of everything. Can't wait to install these.

    Yes, I would recommend this item to a friend!


    Was this review helpful to you?

    5 Stars   Excellent
    By on 7/13/2015
    Just as previous folks have said. FRPP gears are the only way to go in your mustang and these kits have everything you need for a flawless swap.

    Yes, I would recommend this item to a friend!


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    5 Stars   Perfect
    By on 4/21/2015
    It gave me the power I was looking for per gear. I have more pull all around now and I really enjoy it on my 95 Cobra 5.0

    Yes, I would recommend this item to a friend!


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    5 Stars   great upgrade
    By on 7/23/2015
    I've had these installed for a week now and love it. Made a big difference. Good bang for your buck.

    Yes, I would recommend this item to a friend!


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    5 Stars   Always a 1st mod to any Stang.
    By on 4/20/2015
    This is my 5th pony. I always mod the rear end 1st. Great product from a great company.

    Yes, I would recommend this item to a friend!


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    5 Stars   WOW
    By on 2/16/2015
    So happy with the rear end
    Can tell a huge difference from the stock 2.73 gears

    Yes, I would recommend this item to a friend!


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    5 Stars   more power
    By on 12/8/2014
    Got them put in last week can what for the brake in so I can really get on it

    Yes, I would recommend this item to a friend!


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    5 Stars   Good bang for the buck!
    By on 4/29/2015
    I should have bought this and put it in the day I bought the car!

    Yes, I would recommend this item to a friend!


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    5 Stars   Great product
    By on 8/25/2014
    Great gear for highway going places and track love it

    Yes, I would recommend this item to a friend!


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    5 Stars   great kit
    By on 4/13/2015
    Quick performance you can feel

    Yes, I would recommend this item to a friend!


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    Vehicle Applications

    Ford Mustang - 1986 (86) - 1987 (87) - 1988 (88) - 1989 (89) - 1990 (90) - 1991 (91) - 1992 (92) - 1993 (93) - 1994 (94) - 1995 (95) - 1996 (96) - 1997 (97) - 1998 (98) - 1999 (99) - 2000 (00) - 2001 (01) - 2002 (02) - 2003 (03) - 2004 (04) - 2005 (05) - 2006 (06) - 2007 (07) - 2008 (08) - 2009 (09)


    About This Brand


    Ford Racing
    Ford Racing - Mustang Ford Racing Parts
    Ford Performance Racing Parts is the leader in performance parts and accessories for Mustang and Ford Lightning.

    LatemodelRestoration.com is proud to offer Ford Racing Performance Parts for your project. Ford Racing is dedicated to manufacturing the highest quality products offered in the industry. Choose from suspension, exhaust, wheels, and other performance parts at LatemodelRestoration.com. If you want the best for your Mustang or SVT Ligtning, look no further than Ford Racing Performance Parts!

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