Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

tell me what gear ratio i have

Discussion in 'The Garage' started by beater74, Dec 13, 2004.

  1. beater74

    beater74 1/2 ton status

    Joined:
    May 29, 2001
    Posts:
    1,749
    Likes Received:
    0
    Location:
    atlanta
    okay i picked up a van 14ff from my pickandpull yesterday. $86.
    i know how to tell from the #'s on the ring what ratio i have but i have never heard of this ratio or i for got how to read the #'s.

    it reads 1 GM 464917 12 45 6 80
    so you take 45/12=3.9 hu i have never heard of a 3.90 gear ratio. i this right?
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    Uh , my calculator here on this here windows 98 box at work say 45 divided by 12 is 3.75 :dunno: I tried it like 20 times and it keeps saying 3.75 :k5: :k5:
     
  3. tarussell

    tarussell 1/2 ton status

    Joined:
    Dec 28, 2002
    Posts:
    1,354
    Likes Received:
    0
    Location:
    Bagdad , FL
    My calculator shows 3.75 too .

    That is a common "G" series ratio .
    Tom
     
  4. beater74

    beater74 1/2 ton status

    Joined:
    May 29, 2001
    Posts:
    1,749
    Likes Received:
    0
    Location:
    atlanta
    yeh thanks geeze i'm a dumb ass
     
  5. 3 on the tree

    3 on the tree 1/2 ton status

    Joined:
    Oct 16, 2004
    Posts:
    3,970
    Likes Received:
    0
    Location:
    gunnison colorado
    When did GM change from 3.73 to 3.75?
     
  6. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    Don't know when they changed , but its within 5 percent tolerance to be mated with a 3.73 front :k5: :k5:
     
  7. tarussell

    tarussell 1/2 ton status

    Joined:
    Dec 28, 2002
    Posts:
    1,354
    Likes Received:
    0
    Location:
    Bagdad , FL
    GM did not change to it or from it . That gear ratio was offered in the Vans and some commercial applications.

    The 3.75 ratio is noisier than the 3.73 ratio that was offered in the trucks and passenger versions of the Van. The 3.75 tooth profile is stronger at the sacrifice of gear noise.
    Tom
     

Share This Page