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How Do I Find Gear Ratio?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Charmeiser, May 5, 2025 at 9:36 PM.

  1. May 5, 2025 at 9:36 PM #1
    Charmeiser

    Charmeiser Bobtail Member

    18
    20
    Apr 29, 2023
    0
    Bought a pete 378 and wanted to check the status of the rears. Also want to find the gear ratio so I can also change the seal. I can't find a placard on it anywhere. How do I find the gearing?
     
    Charmeiser, May 5, 2025 at 9:36 PM
    Charmeiser, May 5, 2025 at 9:36 PM
    #1
    blairandgretchen Thanks this.
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  3. May 5, 2025 at 10:23 PM #2
    blairandgretchen

    blairandgretchen Road Train Member

    13,251
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    Dec 9, 2011
    South west Missouri
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    Pressure wash that rear end, there might be a tag on it - aluminum.

    Check VIN with Pete, find out what it came out with originally , unless it's been changed.

    For a start.

    Then thee's the tire size/RPM etc mathematical stuff . . . :)
     
    blairandgretchen, May 5, 2025 at 10:23 PM
    blairandgretchen, May 5, 2025 at 10:23 PM
    #2
    Sons Hero Thanks this.
  4. May 5, 2025 at 10:27 PM #3
    Sons Hero

    Sons Hero Road Train Member

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    check the driver side door post. Mine has a sticker there that says what rears it has
     
    Sons Hero, May 5, 2025 at 10:27 PM
    Sons Hero, May 5, 2025 at 10:27 PM
    #3
    Star Rider and blairandgretchen Thank this.
  5. May 5, 2025 at 10:33 PM #4
    wore out

    wore out Numbered Classic

    15,407
    185,927
    Jun 5, 2013
    CHASIN THE DEVIL'S HERD
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    The back rear end it’s stamped in the end of the pinion it just takes some cleaning to do.
    To get a seal all you gotta know is 402, 404. DS40 etc
     
    wore out, May 5, 2025 at 10:33 PM
    wore out, May 5, 2025 at 10:33 PM
    #4
    Magoo1968, Star Rider, ‘Olhand and 2 others Thank this.
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