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14 bolt

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 76K5, Jan 25, 2002.

  1. 76K5

    76K5 Registered Member

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    Hey guys, I just bought this kick butt 14 bolt from a junkyard. The tag on the outside was missing. However the code on the axle tube was "RFHG0961". Also when I popped the diff cover it had a serial # on the ring gear "1 GM 3992484 11 41 3 77". Also it seemed that the ratio was 4.11 when I counted the turns. My questions are, what ratio does this serial # denote, does the 3 77 denote 3.77's? Also how do I tell if it is a gov-lock model? Also, as far as mounting this beast, I know I need the trick u-joint, but I need to know where to get it and what part #. Also the 14 bolt was out of a 78 3/4 ton, so I think the spring perches are cool, but what about the shock mounts? Anyway I know I have alot of questions, but any help you all could give me would be much appreciated. By the way my Blazer is a 76 K5. Thanks.

    If in doubt, gun it.
     
  2. txbartman

    txbartman 1/2 ton status

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    The ratio is 3.73. In the serial number, the 11 41 is the tooth count. That is 41 ring gear, 11 pinion. 41/11 = 3.73. Hence, the ratio.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  3. txbartman

    txbartman 1/2 ton status

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    The ratio is 3.73. In the serial number, the 11 41 is the tooth count. That is 41 ring gear, 11 pinion. 41/11 = 3.73. Hence, the ratio. The 77 indicates it was made in 1977. I don't know about the 3. Maybe, since it came out of a 78 model, the 3 designates 3rd quarter. Just guessing there, though.

    Brian
    Check out <a target="_blank" href=http://tx85gmcguy.alloffroad.com>My Jimmy</a> with all her projects!
     
  4. thatK30guy

    thatK30guy 1 ton status Premium Member

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    The 3 is the month it was made. March of '77 is when the rear was built.



    <font color=red>Only real men drive K30's!!!</font color=red> [​IMG]

    <a target="_blank" href=http://coloradok5.com/gallery/thatK30guy>The K30 Collection</a>
     
  5. 76K5

    76K5 Registered Member

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    how do I tell if it is a gov lock? And what do I need to do to the shock mounts. Thanks

    If in doubt, gun it.
     
  6. mike reeh

    mike reeh 1/2 ton status

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    peel out and see how many stripes are left :)
     
  7. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i guess just pull the cover and look at the diff. if it's full of complicated junk it's gov-lock but i don't know, i've never seen an open carrier.

    --Scott, 1989 GMC Suburban 2500 4" lift, 36" TSLs
    <a target="_blank" href=http://community.webshots.com/user/muddysub>http://community.webshots.com/user/muddysub</a>
     

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