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.

3:50 ratio?

Discussion in 'The Garage' started by fireplug, Sep 19, 2005.

  1. fireplug

    fireplug 1/2 ton status

    Joined:
    May 3, 2005
    Posts:
    1,692
    Likes Received:
    0
    Location:
    Toronto, Canada
    I know you guys answer these questions all the time so hopefully you won't mind yet another. I'm trying to help a guy ID his axle, got the following;

    2GM14012196 13 42 12 80 so if I'm correct you divide 42 by 12? That would mean a 3:50 ratio. Does that even exist, or did he give me the wrong numbers?

    Along the same lines, I'm pretty sure it is a 14 sf as it has 8 bolt wheels, 14 bolts on the pumpkin but what throws me off is that the pumpkin is definitely smaller than my 14bff, most notably the bottom edge appears to have less of a 'point'. Does the semi float have a different pumpkin, or is this another axle?

    Thanks guys. Jason.
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    How about 13/42 which is 3.23 gears . There were 3/4 tons in the mid 80's available with 3.23's :dunno: for sure though
     
    Last edited: Sep 25, 2005
  3. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

    Joined:
    Dec 14, 2001
    Posts:
    22,059
    Likes Received:
    69
    Location:
    Pleasanton, CA.
    Pauly is correct, there are 13 teeth on the pinion gear and 42 on the ring gear so divide 42 by 13 and you get 3.23:1 gearing which is available and also a rare ratio to find. The 12 80 is the production date meaning December of 1980.
     
  4. divorced

    divorced 3/4 ton status

    Joined:
    Jul 20, 2004
    Posts:
    5,115
    Likes Received:
    0
    Location:
    .
    Look for 8 bolts holding an axleshaft in the hub. If it has the 8 bolts it is a FF, if the axle looks like a 10 or 12 bolt then it's a SF.
     
  5. fireplug

    fireplug 1/2 ton status

    Joined:
    May 3, 2005
    Posts:
    1,692
    Likes Received:
    0
    Location:
    Toronto, Canada
    yeah it's definitely a semi float, I just couldn't understand the seemingly lower profile of the pumpkin. Thanks for the ratio help. Jason.
     
  6. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    The ring gear is smaller than a full floater , thats why the pumpkin is smaller :D
     
  7. fireplug

    fireplug 1/2 ton status

    Joined:
    May 3, 2005
    Posts:
    1,692
    Likes Received:
    0
    Location:
    Toronto, Canada
    Oh :doah: I thought they were the exact same beast other than the obvious. Being a noob is tough, sooooo much to learn. Cool thanks.
     
  8. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    Don't worry about it . Keep bugging us with questions , read everything you can get your hands on , and enjoy your trucks :D
     

Share This Page