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    Author Topic: what gears do I have?  (Read 1899 times)

    Offline kowalski

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    what gears do I have?
    « on: April 11, 2004 - 10:46:09 PM »
    I was wondering what gears do I have? I have a 73 318 chally with a 904. i looked on the axel tag but it was too torn up to read!!  it's an 8 3/4.  At 40 mph i'm at about 2800 to 3000 rpm and at 65 to 70 i'm at about 3400 to 3800 rpm!! could someone help me out!!
     
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    1970 318 bored .060 over edelbrock performer intake ported and polished 360 J heads 2.02 intake 1.60 exhaust double springs carter hi cap fuel pump edelbrock victor series water pump MSD 6AL flotech headers


    Offline DodgeFreak

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    Re:what gears do I have?
    « Reply #1 on: April 11, 2004 - 10:50:06 PM »
    if i had to guess i would say around 4.10s becasue my dads 318 727 runs almost 3grand at 60.. with 3.55s
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    74 Plymouth Duster- restoring

    77 Dodge D150 shortbox- as long as i don't change my mind will be a step side dually diesel or a 383 powered truck

    04 durango 4.7

    Offline kowalski

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    • Challenger=SCCA Trans Am Homologation Special
    Re:what gears do I have?
    « Reply #2 on: April 11, 2004 - 10:53:07 PM »
    does anyone know where I can find cheap but good gears for my 8 3/4?
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    1970 318 bored .060 over edelbrock performer intake ported and polished 360 J heads 2.02 intake 1.60 exhaust double springs carter hi cap fuel pump edelbrock victor series water pump MSD 6AL flotech headers

    Offline DodgeFreak

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    Re:what gears do I have?
    « Reply #3 on: April 12, 2004 - 01:02:09 AM »
    randy's ring and pinon are good gears i have heard but pricey..and i don't know what all they carry for...
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    74 Plymouth Duster- restoring

    77 Dodge D150 shortbox- as long as i don't change my mind will be a step side dually diesel or a 383 powered truck

    04 durango 4.7

    Offline Chryco Psycho

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    • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
    Re:what gears do I have?
    « Reply #4 on: April 12, 2004 - 03:23:07 AM »
    you can get gears from Mopar , Mark Williams , Strange , Eaton gear , Precision , Shop around
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    Challenger - You`ll wish You Hadn`t

    Offline Autophile

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    • Kowalski... and the keys to a sawed-off weekend!
    Re:what gears do I have?
    « Reply #5 on: April 12, 2004 - 12:19:50 PM »
    kowalski, what size is your tire? Tire size (diameter) can make a big difference in your rpms on the road.
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    1971 Cuda, black/black, 419 cu. in. 3G Hemi with twin turbos (build in progress), AlterKtion, Wilwood 12.19" disks, billet Rallye wheels

    Offline DodgeFreak

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    Re:what gears do I have?
    « Reply #6 on: April 12, 2004 - 03:29:28 PM »
    Good point auto....forgot about that... ::)
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    74 Plymouth Duster- restoring

    77 Dodge D150 shortbox- as long as i don't change my mind will be a step side dually diesel or a 383 powered truck

    04 durango 4.7

    Offline kowalski

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    • Challenger=SCCA Trans Am Homologation Special
    Re:what gears do I have?
    « Reply #7 on: April 18, 2004 - 01:25:19 AM »
    245/45/17 in the rear 225/50/17 in the front
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    1970 318 bored .060 over edelbrock performer intake ported and polished 360 J heads 2.02 intake 1.60 exhaust double springs carter hi cap fuel pump edelbrock victor series water pump MSD 6AL flotech headers

    Offline DodgeFreak

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    Re:what gears do I have?
    « Reply #8 on: April 18, 2004 - 08:51:42 AM »
    i'm still gonna guess 3.91s or 4.10s
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    74 Plymouth Duster- restoring

    77 Dodge D150 shortbox- as long as i don't change my mind will be a step side dually diesel or a 383 powered truck

    04 durango 4.7

    lemonboy69

    • Guest
    Re:what gears do I have?
    « Reply #9 on: April 27, 2004 - 11:51:02 PM »

    Wanna sell me your gears?!?!? 8) 8) I need something better then a 2.94 for my 'Cuda... ;)

    LB
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    Offline MAXcuda

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    Re:what gears do I have?
    « Reply #10 on: April 28, 2004 - 04:37:55 PM »
    Kowalski,

    Here is a formula to calculate your rear end ratio:

    (Tire diameter)*(RPM)/[336.14*speed]=(rear end ratio)

    Where tire diameter is in inches, speed in miles per hour.
    This is for top gear only, (1:1).  If you wanted to use this for another gear, you would have to stick the transmission ratio for that gear in the denominator also.

    Hope that helps.
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