gear ratio?

Discussion in 'Trucks and Trailers' started by zim bob the landscaper, Jun 4, 2007.

  1. zim bob the landscaper

    zim bob the landscaper LawnSite Bronze Member
    Posts: 1,707

    how do you find the gear ratio on a truck btw its a 89 ford f250 and i want to swap out the axle for a dually 1 ton axle but dont knoe the gear ratio thanks alot!
     
  2. CLARK LAWN

    CLARK LAWN LawnSite Silver Member
    Posts: 2,526

    couple of ways find the tag on the rear end housing (if its still there) or you can pull the cover and it will be stamped on the ring or count the teeth on the ring and divide that by the number of teeth on the pinion.
     
  3. zim bob the landscaper

    zim bob the landscaper LawnSite Bronze Member
    Posts: 1,707

    there is a small medal tag with a bunch of numbers but not the ratio do i do something with those numbers

    i think it says on it L70 10 29D20
     
  4. BZB_Helpers

    BZB_Helpers LawnSite Member
    Posts: 131

    you have half the tag, there is two lines to the axle tag. The first thing it will say is 3L55, 3 55, 4L10, 4 10, 3L73, 3 73. The "L" is limited slip and without it the diff is open
     
  5. mcwlandscaping

    mcwlandscaping LawnSite Gold Member
    Posts: 3,164

    There may be a code in the glove box.....don't know what the ford code would be though
     
  6. zim bob the landscaper

    zim bob the landscaper LawnSite Bronze Member
    Posts: 1,707

    heres a pic of the sticker inside the door not great but ok

    trucks022.jpg
     
  7. zim bob the landscaper

    zim bob the landscaper LawnSite Bronze Member
    Posts: 1,707

    if you could tell me the code that would be awsome
     
  8. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Posts: 4,276

    The bolt on the tag on the rear end usually will cover the first part of axle ratio.

    Take the vin and take it too the dealer an dthey can tell you.
     
  9. BZB_Helpers

    BZB_Helpers LawnSite Member
    Posts: 131

    if that sticker says "B5" as the axle code, then its a 4.10 limited slip
    if its a 35 axle code then its a 4.10 open
     

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