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Thread: Trying to figure out what gears...

  1. 06-13-2007, 01:08 AM #1
    1_slo_92's Avatar
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    Trying to figure out what gears...

    I have in my 88 mustang Gt It seems as if it is geared high (55mph sitting around 1700 or so. I want to daily it so maybe I should swap in some 3.73's?

    Also what is the next step up from a 3.73?

    Thank you in advance.
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  2. 06-13-2007, 07:32 AM #2
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    dedpedal
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    Jack it up and mark the tire and the driveshaft. Count how many turns the shaft makes to complete one turn of the tires. 3 1/2 turns =3.55 gears, 3 3/4 turns =3.73. 4 turns is a 4.10 and 4 1/4 is 4.30s.
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  3. 06-13-2007, 09:11 AM #3
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    http://bbs.hardcore50.com/calc/?mode=speedforrpm

    That is a link to a rpm/speed calculator...just have to know your tire height and trans gear ratio (in a t5 isn't 5th .8?).
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  4. 07-06-2007, 08:12 PM #4
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    Question

    Quote Originally Posted by 1_slo_92 View Post
    Also what is the next step up from a 3.73?
    3.90s.

    What type tranny have you got ?
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  5. 07-10-2007, 10:11 AM #5
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    T-5, hoping to build the heck out of the car so im sure it will change eventually.
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  6. 07-10-2007, 10:14 AM #6
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    i would say 3.73 or 3.90 or 4.10 but wouldnt go much more then a 4.10 for daily driving
    1990 mustang lx convertible 5.0 almost all stock, best time so far 14.796 @ 93.48 new motor and trans coming this winter i hope
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  7. 08-02-2007, 01:52 PM #7
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    what is the gear ration for 4th in a t.5
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  8. 08-02-2007, 02:10 PM #8
    Black Hole
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    Quote Originally Posted by slvr87cpe View Post
    what is the gear ration for 4th in a t.5
    1:1 right?

    That's why you dyno in 4th gear....
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  9. 08-02-2007, 03:55 PM #9
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    Thumbs up

    Quote Originally Posted by Black Hole View Post
    1:1 right?
    Correct.
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  10. 08-02-2007, 04:58 PM #10
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    How do you figure out what gear ratio you have when you don't have any axles? :p
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  11. 08-02-2007, 05:11 PM #11
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    Quote Originally Posted by ADaughen View Post
    How do you figure out what gear ratio you have when you don't have any axles? :p
    Take it apart and count the gear teeth....
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