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Motive Gear Performance Plus Ring and Pinion Gear Kit - 4.10 Gear Ratio (79-85 V8)

Item 21101G87
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$227.48

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      Product Information

      Features, Description, Reviews, Specs & Installation

      Features

      • Superior Quality
      • CNC-Cut from 8620 Gear Steel
      • 4.10 Gear Ratio
      • 7.5" Ring Gear Diameter
      • For Street or Track Use
      • Fits 1979-1985 V8 Mustangs

      Description

      Improve Performance. Wake up your V8-powered pony for faster acceleration off the line with a set of 4.10 Motive Performance Plus gears. A steeper set of gears will get you into your power band faster for faster launches and more punch off the line.

      Superior Construction. These Motive ring and pinon gears are CNC cut from high grade 8620 gear steel, and factory lapped for precision fit. Each set is hardness tested prior to leaving the factory to ensure the highest quality.

      Recommended Upgrade. Changing the rear axle gear ratio will throw off the calibration of your Mustangs speedometer, but a new Speedometer Gear is an inexpensive way to fix this issue.

      Application. This Motive Performance Plus Ring and Pinion Gear set will fit all 1979 to 1985 V8 Ford Mustangs equipped with a 7.5" rear end. A master bearing kit is recommended by most installers, especially on high mileage vehicles, see drop down option above.

      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.

      Fitment: 1979 1980 1981 1982 1983 1984 1985 Details

      MPN# F7.5-410

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

      4.4

      Customer Reviews (14)

      Write a Review

      Ratings Summary

      4.4 out of 5 overall rating from 14 customers


      • October 01, 2010

        1 - Dan B.

        Absolutely terrible

        took these to a shop to get professionally installed and they said the pinion thread was not right so they cannot tighten it. Probably going to have to return them and buy Ford Racing gears. Car is ripped apart right now and wont be able to drive it until I get something to put in. DO NOT RECOMMEND!!!

        Helpful (4)
      • April 28, 2010

        5 - Gillian

        Amazing

        These gears are awsome, I get so much acceleration in my first three gears now with only a little drop in mpg. This is a great product with Limited Slip Differential. Smokin them ricers all the time now. lol

        Helpful (4)
      • April 19, 2010

        3 - JEAN

        its a mess but worth it to install

        Well i bought these and when i went to install them i noticed some problems. the number one problem was that the cross shaft pin absolutely has to be grinded down if you do not buy the posi trac diffriental. the ring gear is alot thicker than that of the stock 323 gears. another thing is that the recommended parts does not say anything about this. TRUST ME IT IS A MESS TO INSTALL BY YOUR SELF BUT WELL WORTH THE POWER DIFFERENCE. IT IS NICE TO SHIFT INTO FOURTH GEAR AND HEAR A BARK WITH BRAND NEW TIRES LOL AND BY THE WAY EVERY ONE THAT COMPLAINS ABOUT THE WHINING NEEDS TO CHECK THEIR BACK LASH ON THEIR CRUSH SLEEVE BECAUSE THAT IS WHAT CAUSES IT TO WHINE

        Helpful (4)
      • March 23, 2010

        5 - Ryan M

        4.10 Gears (V6)

        Got these installed and at first I was taking it easy on the car and began to wonder why I'd bothered getting the gears. Then I stepped on it and that was the moment I fell in love. The car pulls much better combined with the 7.5" Tlok.

        Helpful (5)
      • March 06, 2010

        5 - Bill Waudby

        SWEET

        I had this installed with a T-Lok. After a day of driving, I still have a stupid smile i can't get rid of. American Muscle is the Best. Can't wait to get my tuner and CAI.

        Helpful (4)
      • February 05, 2010

        4 - SLUTER

        BREAKAGE

        HAD THESE AFTER I GOT BACK FROM DEPLOYMENT IN JULY OF 09 AND IN DECEMBER THEY BROKE AND TORE THE WHOLE REAR-END OUT. SO IF YOU PUT 4.10'S IN, MAKE SURE YOU PUT IN GOOD AXLES, FORD RACING PARTS, AND LUBE IT UP WITH ROYAL PURPLE OR YOU WILL BE SITTING IF YOU HAVE ANY KIND OF MAJOR MOD WORK LIKE MOTOR OR FORCED INDUCTION LIKE MYSELF

        Helpful (4)
      • October 16, 2009

        5 - Austin

        4.10's & Royal Purple

        Bought these and put them in along with a couple of other mods and put royal purple gear lube in to make sure they would set better and the result?? Roasting both tires like a Gt and getting around a whole lot faster! The only downfall is that if they arent set to the exact point then the driveshaft gets out of balance and you have to buy a coastline 4" 1 piece aluminum cause it will vibrate you to death if you dont!

        Helpful (4)
      • October 09, 2009

        5 - John

        4.10's

        These really wake your pony up big time. Be sure you have a tuner or your speedometer will be off by about 15mph. Also be sure to be very gentle with your throttle for the first 500 miles or you'll break your gears.

        Helpful (3)
      • September 07, 2009

        5 - Paul Schacknies

        OH YEAH!!!

        These gears have been the best modification I have done to my car. Linked to my 5 speed my car feels like a rocket now!!! REALLY fast shipping too!!!

        Helpful (4)
      • August 26, 2009

        5 - Jamar Risinger

        ACCELERATE!!!

        I had to get my gears from somewhere else because I couldn't wait for restocking but AM still has the best price with free shipping. I had to do a small grind on the cross shaft pin after setup was complete to finish up the install. motive's site states that a special cross shaft pin is needed with these gears. a grind hooked it up though. overall, great! the accelleration is awesome and there is no whining or grinding.

        Helpful (5)

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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Ring gear
      • (1) Pinion gear

      Tech Specs

      Approximate RPM for 1979-1985 GT


      Manual
      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 4261 5965        
      2 2516 3523 4529 5535 6542  
      3 1682 2354 3027 3700 4372 5045
      4 1264 1770 2276 2782 3287 3793
      5 847 1186 1525 1864 2203 2541


      Automatic
      Gear @25 MPH @35 MPH @45 MPH @55 MPH @65 MPH @75 MPH
      1 3034 4248 5462 6676    
      2 1854 2596 3338 4080 4821 5563
      3 1264 1770 2276 2782 3287 3793
      4 843 1180 1517 1854 2192 2529

      Will It Fit My Mustang

      • Other - 79, 80, 81, 82, 83, 84, 85

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