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Somebody Tell me I am right...

Discussion in 'The Garage' started by BlazerWheels, Jan 12, 2005.

  1. BlazerWheels

    BlazerWheels 1/2 ton status

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    PLEASE!!!! I opened up my rear diff today (change gear oil) and I think I may have 4.10's instead of the 3.08 that I thought (from looking in glove box).

    Anyway, I know you are supposed to divide 2 numbers that are stamped on the ring, but I am not sure of which 2...here are the numbers as they read directly off of the ring...

    2 GM 3(could be a 5)988515 10 41 1 83(or 5)

    I think the ones in red are the two that I divide...and if so that means I have 4.10's
     
  2. beater_k20

    beater_k20 Banned

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    you would be correct.
     
  3. Stomper

    Stomper ΜΟΛΩΝ ΛΑΒΕ GMOTM Winner

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  4. k20

    k20 3/4 ton status

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    if i were you, I would check that the front ratio matches.
     
  5. R72K5

    R72K5 Banned

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    83(or 5) is your year stamping

    what axle model ? what year and model of truck ?

    im assuming 10 bolt,

    so 4.10 is really interesting..
     
  6. 85mudblazin

    85mudblazin 1/2 ton status

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    I would just count the teeth to be %100 sure, divide the ring gear by the pinion gear. :xmas:
     
  7. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    those would be 4.10's...no question.

    Rene
     
  8. beater74

    beater74 1/2 ton status

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    how do you count the teeth on pinion gear with the ring gear installed?
     
  9. ntsqd

    ntsqd 1/2 ton status

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    Clean off the end of one of the teeth and put a blotch of paint or some other mark on it. The slowly spin the pinion gear while counting teeth. It may help to stick a piece of wire in there to act as a pointer.
    MArk the ring gear teeth the same way.
     
  10. beater_k20

    beater_k20 Banned

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    1-2-3-4-5-6-7-8-9 and so on...:D
     
  11. BlazerWheels

    BlazerWheels 1/2 ton status

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    Year is '85 K5. Axles have not been swapped (I think) bought it from my uncle who is VERY anal retentive. So I know HE did not swap them....

    Yes 10 bolts...

    Reason I thought that I had 3.08's (until I pulled cover) was the code in the glove box. Actually says 3.08 rear axle ratio on sticker...then I pull the cover and HELLO...:D :D :D

    It also says it has a traction locker (I forgot exact words) maybe you can ID this for me...
    http://www.norcalbigdawgs.net/phpBB2/viewtopic.php?t=5993
     
  12. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Looks like not a Gov lock. Limited slip of some sort I guess.

    You definitely have a less common diff if it truly is as stock as you say.

    Rene
     
  13. big jimmy 91

    big jimmy 91 1/2 ton status

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    UH OH , looks like a gov lock :screwy:
     
  14. BlazerWheels

    BlazerWheels 1/2 ton status

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  15. Muddytazz

    Muddytazz 1 ton status

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    All the gov-loc's i've ever seen have never had that big "I" chunk of steel in the center of the spider gears.
     
  16. BlazerWheels

    BlazerWheels 1/2 ton status

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    ANy ideas then??
     
  17. Muddytazz

    Muddytazz 1 ton status

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    Have you tried looking on ebay for pics of what people have listed for sale to maybe figure it out?
     
  18. BlazerWheels

    BlazerWheels 1/2 ton status

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    Nope...maybe I'll give that a try tomorrow...
     
  19. az-k5

    az-k5 1/2 ton status

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    That thick ass ring gear is also a dead give away of other than 3.08 gears. With a stock GM stamp on it that is an awsome find. I would still check the front just to be safe.
     
  20. big jimmy 91

    big jimmy 91 1/2 ton status

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    It's the same as mine , a gov lock , grenade locker

    There are some crappy pics of mine in my web shots under "whats this" ,and everyone here id. it as one
     

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