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FACTOID: Deciphering Ring Gear Stamping information.... D60 & 14BFF

Discussion in 'The Garage' started by Greg72, Oct 16, 2003.

  1. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    I'm not actually able to decipher them for you, but I can give an example of each and give you my best guesses....I will leave it to the rest of the CK5 community to "fill in the blanks" for this topic:


    Let's start with a Dana 60 front:

    [​IMG]

    Actual stamping sequence reads:

    11 1 79 DANA D 30360 B3R33 41-10


    11 1 79 = Production Date (November 1st, 1979)
    41-10 = Ring Teeth vs. Pinion Teeth...in this case it's a 4.10 ratio








    And now a 14BFF Rear (not from the same vehicle BTW!):

    [​IMG]


    Actual Stamping sequence reads:

    1 G1 464917 12 45 10 79
    (Could also start "1 GA"...stamping is not clear)

    12 45 = Pinion Teeth vs. Ring Teeth? In this case meaning 3.73?
    10 79 = Date Code? October of 1979?



    Those are my best guesses.... if anyone can help, I'll update this with better info.
     
  2. 87BrnRsd

    87BrnRsd 1/2 ton status

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    Yep, you got it right on the 14ff. 3.73, and it was made in October of 79'.
    -Harrison
     
  3. rockink5

    rockink5 1/2 ton status

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    [ QUOTE ]
    1 G1 464917 12 45 10 79
    (Could also start "1 GA"...stamping is not clear)

    [/ QUOTE ]

    I think it is GM thats what mine says.

    So does that mean that the last 2 sets of digits are the year?

    Mine reads......

    1GM 39777333-9-41 11 73 on the ring

    and..........

    3977336-9-41-GM on the pinion

    That would mean 4.56 GM ring gear from 11-73?
     
  4. Don

    Don 1/2 ton status

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    30360= dana part #
    b3r33= dana batch #
    /forums/images/graemlins/eek.gif /forums/images/graemlins/grin.gif
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I would believe 41 and 9 means 4.56, yes. /forums/images/graemlins/smile.gif
     
  6. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    more info on this junk over at POR in the D60 bible... not sure about the ff14b tho...

    j
     
  7. scrappy88

    scrappy88 1/2 ton status

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    41 and 11 is 3.73.. 41 divided by 11 = 3.73

    Nice to have the date code, now I know what year my 14b is from. /forums/images/graemlins/smile.gif
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I have honestly never seen a 45 tooth ring gear on a 14 bolt before...

    The ratio's I've seen all use a 41 tooth ring gear.

    41/12...3.42:1
    41/11...3.73:1
    41/10...4.10:1
    41/9...4.56

    Greg, could you physically count the ring gear teeth on that 14?

    Rene
     
  9. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Rene,

    I didn't count the teeth, I just extrapolated what I thought must be the numbers for the "date code" and "gear ratio" based on which numbers looked plausible.....

    I remember that 41 seems to be a common tooth count, but perhaps that's for the Dana 60? The 14BFF has a larger ring gear than the 60, so maybe 45 teeth is believable? /forums/images/graemlins/thinking.gif

    .....like I said, I'm not the expert. But I'll bet someone here IS!
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    [ QUOTE ]
    41 and 11 is 3.73.. 41 divided by 11 = 3.73

    [/ QUOTE ]

    Oops I'm sorry. Its 9-41...4.56. I did the right division, just typed the numbers wrong when I posted it. Let me edit it.
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Greg,

    What I was trying to say was every 14 I've ever looked at had a 41 tooth ring gear. I know some Dana axles use a different tooth count on the ring gear...but 14's seem to be exclusively 41 tooth for some reason.

    Is the second pic of a diff in your posession or??

    I'm not saying it isn't possible, but if you think about it why would GM use a 12/45 set (3.75:1) when they already have the 11/41 set (3.73) /forums/images/graemlins/thinking.gif /forums/images/graemlins/1zhelp.gif

    Rene
     
  12. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    Rene,

    No IDEAR....! /forums/images/graemlins/eek.gif

    The pic is of a new van-width 14BFF I picked up on the way home from BB03.

    I snapped the pic, and took my best guess about the stamping numbers and their meaning. Looks like I will have to wait for more knowledgeable folks to clear up this confusion for us... /forums/images/graemlins/thinking.gif
     
  13. tarussell

    tarussell 1/2 ton status

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    Either on this board or Pirate - this 3.75 ring/pinion gear combo was discussed a few months back . It seems that GM used a stronger but noisier tooth count on some van applications. Most GM Vans that came with a FF were work vehicles and its intended useage may have demanded the stronger gear combo and the noise would not have been that noticeable in such a work orriented(sp) application.
    HTH , Tom
     
  14. Greg72

    Greg72 "Might As Well..." Staff Member Super Moderator

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    [ QUOTE ]
    Either on this board or Pirate - this 3.75 ring/pinion gear combo was discussed a few months back . It seems that GM used a stronger but noisier tooth count on some van applications. Most GM Vans that came with a FF were work vehicles and its intended useage may have demanded the stronger gear combo and the noise would not have been that noticeable in such a work orriented(sp) application.
    HTH , Tom

    [/ QUOTE ]

    HA!

    Your comments inspired me.... see link


    http://www.usgear.com/tl/gm3.htm




    They have a chart with all the 14BFF tooth counts.....including (drumroll please) the elusive 45-12 gearset combo!!!
     
  15. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Cool deal, I knew it was odd to say the least...and had never seen that particular combo before.

    Rene
     

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