77 C20 What Is My Rear End Ratio?

Discussion in '1973-1987' started by cardstroker, Dec 30, 2007.

  1. cardstroker

    cardstroker Member

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    Dec 30, 2007
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    I have a '77 C20 CCT247Jnnnnnn, model CC20903. G51 code on glove box lid, HHM G2951 is stamped on axle. What is my rear end ratio?
     
    cardstroker, Dec 30, 2007
    #1
  2. Heavy86Chevy

    Heavy86Chevy Member

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    Oct 11, 2006
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    British Columbia Canada
    Count the teeth on the crown gear and count the teeth on the pinion gear, than using a calculator divide the crown gear number with the pinion gear number to get the ratio.
     
    Heavy86Chevy, Feb 10, 2008
    #2
  3. Pontiac1976

    Pontiac1976 Member

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    I belive that G51 is hd rear springs code.
     
    Pontiac1976, Feb 11, 2008
    #3
  4. David Hall

    David Hall Member

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    [​IMG][/IMG]GU2 / Rear Axle-2.73 Rat
     
    David Hall, Jun 5, 2008
    #4

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