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  •  » FYI Ford, Classic Mustang Tech Discussion
  •  » What rear Gears to run

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    8/29/2020 12:31 PM  #26

    TKOPerformance
    Hyper FYIFORD ADDICT

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    From: Newark, DE
    Registered: 12/15/2014
    Posts: 7,502

    Re: What rear Gears to run

    Bullet Bob wrote:

    Using your 10:1 guide, Tom, seems about right.  My 90 GT had 3.55 with the Z-box and felt perfect on the street.  The Heap with the AOD always felt pretty dead off the line.  Well, the AOD has a 2.40 first gear and with the 3.55 I have in the rear that's 8.5:1 which is a bit tall.  The new 4R with 2.84 first gear comes in at 10.0:1 exactly so it should feel a lot better.

    OBTW:  I was "raised" by guys who said that first gear is "low gear" and third gear is "high gear".  So when I refer to a high ratio...4.10:1... I call that a "low gear" or short,  and a low ratio like 2.72:1 is tall or "high gears".  Just a difference in terminology and probably who first taught us this stuff...but it can be corn-fusing.

    BB1

    For sure, I've heard of gears referred to both ways for decades too.  Add in "deep" and "shallow" and it gets even worse!

     

    8/29/2020 3:35 PM  #27

    MS
    Forum Originator

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    From: Canyon Lake, Texas
    Registered: 1/24/2013
    Posts: 12,265

    Re: What rear Gears to run

    We need to do a gas mileage challenge on the next bash trip... we all get there around the same time, no matter the engine size, transmission type Or gear ratio.

    Just for grins.

    Money you enjoy wasting is NOT wasted money... unless your wife finds out.
     

    9/22/2020 9:36 PM  #28

    HudginJ3
    Senior 24-7 FYI Addict

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    From: Cedar Hill, TX
    Registered: 4/29/2015
    Posts: 1,249

    Re: What rear Gears to run

    OK??? How does the 1st gear ratio math work? 1st gear 3.35, rear 3.0.  I'm coming up with 6.35. ????

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
     

    9/22/2020 9:51 PM  #29

    lowercasesteve
    Senior 24-7 FYI Addict

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    From: Auburn, Ca
    Registered: 4/01/2013
    Posts: 1,254

    Re: What rear Gears to run

    HudginJ3 wrote:

    OK??? How does the 1st gear ratio math work? 1st gear 3.35, rear 3.0. I'm coming up with 6.35. ????

    You don't add.  You multiply.  

    Thus: 3.35*3.0 ~10.0
     

    Original owner - 351w,T-5, 4whl disks, power R&P
     

    9/23/2020 8:01 AM  #30

    HudginJ3
    Senior 24-7 FYI Addict

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    From: Cedar Hill, TX
    Registered: 4/29/2015
    Posts: 1,249

    Re: What rear Gears to run

    LOL.  Thanks

    70, ragtop 351W/416 stroker Edel Performer heads w pro flow 4, Comp roller 35-421-8. T5
     

    9/25/2020 6:43 AM  #31

    marsfl1
    FYI FORD Member

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    From: Sarasota, Fl.
    Registered: 8/27/2013
    Posts: 74

    Re: What rear Gears to run

    Go with 350's after 273's you will be satisfied. I have 370's with an AOD and 25540x17's and It's a little to much for the highway
     

    IF IT'S TO LOUD YOUR TO OLD
     

     

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