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Identify the ratio on this 14ff from these numbers?

Discussion in 'The Garage' started by BozoWise, May 12, 2002.

  1. BozoWise

    BozoWise 1/2 ton status

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    These numbers were stamped on the ring gear of a 1974 k20 14 bolt FF. What is the gear ratio? I would think it is a 4.l11 but need confirmation. Thanks in advance.

    3977334 10 41 1 74 GM 2 C-T
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    4.10's...built in Jan 74

    Rene
     
  3. Zeus33rd

    Zeus33rd Smarter than you GMOTM Winner

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    The first group of seven numbers I'm clueless about. Bu the next ones I do know. The 10 is the number of teeth on the pinion, 41 is the number of teeth on the ring. 1 means Januarry, and 74 means 1974. All stock GM ring & pinions have the number of teeth stamped on them. You can get the ratio by dividing the 2--Devide 41 by 10= 4.10.
     
  4. BozoWise

    BozoWise 1/2 ton status

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    You guys rock!

    Now for the next question. How can I tell if there was a factory traction device or if it is just an open dif?
     
  5. Scooter

    Scooter 1/2 ton status

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  6. BozoWise

    BozoWise 1/2 ton status

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    Thanks for the link
     
  7. Klef72K5

    Klef72K5 1/2 ton status

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    FYI the first grop of numbers is just the part number of the ring gear. The pinion will have a different group of numbers. Once they are lapped together they become a matched set of gears and will receive another number that is not displayed anywhere other than the blueprints or a parts store.
     

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