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Rearend Identification Please help

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by blazin72, Nov 11, 2000.

  1. blazin72

    blazin72 1/2 ton status

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    I need help indentifying a rearend. I thought I found a 14 bolt rearend under a 3/4 ton chevy but not for sure that is what it is.
    How do I know for sure what it is?
    I pulled the cover and it has 12 bolts in the ring gear but does that mean its a 12 bolt or a 14 bolt. Do I need to measure the ring gear? Or what is the steps to find out what it is?
    The truck is in a salvage yard and I didnt get the VIN to see what year it was but I believe it is a early 80s. I need HELP. I believe its a 84 model
     
  2. 90K5

    90K5 1/2 ton status

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    If it has 12 bolts onthe ring gear it is a 12 bolt. Also most 12 bolts have 12 on the cover too, but I think in some cars they had 10

    90K5
     
  3. k5king

    k5king 1/2 ton status

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    go to the technical thread on the home page,,,this might help some

    ANYBODY LOSE THEIR JEEP????????[​IMG]
    I JUST FOUND ONE UNDER MY BLAZER!!!![​IMG]
    [​IMG][​IMG]
     
  4. TX Mudder

    TX Mudder 1/2 ton status

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    It's a Corp. 12-bolt 8.875" rear end - semifloating.
    -- Mike
     
  5. 1HIHUM

    1HIHUM 1/2 ton status

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  6. Shawn

    Shawn 1/2 ton status Premium Member Author

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    Don't go buy the ring gear bolts to determine the axle!

    Look at the 14 bolt FF in this article and you will see that it has 12 bolts on the ring gear:
    http://www.off-road.com/chevy/tech/detroit/

    First look at the number of bolts holding the cover on. It should be 14 bolts if it's a 3/4 ton. Now measure the ring gear. If it's 10.5" dia. then it's a 14 bolt FF (full float), if it's less then 10.5" dia. then it's a 14 SF (semi float). The FF should have the large hubs that stick out with 8 bolts like this:
    [​IMG]

    I'm willing to bet it's a 14 FF.


    Shawn
    87 K5
    few mods[​IMG]
     
  7. blazin72

    blazin72 1/2 ton status

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    Shawn
    Thanks for the info as everyone else.
    The rear cover does have 14 bolts holding it on and the carrier bearing caps look just like the ones in the web site address you gave me that was very helpful,
    but the hubs on the ends doesn't look the same. It doesn't stick out like that. Does that mean its a SF rearend? And if thats the case should I not even mess with it. The hubs look like my 12 bolt but with 8 lugs and bigger. The place were I found this rearend has a bunch of dana 60 rearend but I was wanting to hold off and find a 14 bolt. Any more help would be appreciated.
    Thanks
    Brian
     
  8. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    It sounds like a Semi-floater if the drums look like your 12 bolt but bigger. This is also a good rear end, 9.5" ring gear. It still has c-clips, but is stronger than the 12 bolt.

    Rene

    [​IMG]
     
  9. Shawn

    Shawn 1/2 ton status Premium Member Author

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    I agree with Rene and now think that you probably have a 14 SF which is still a good axle. Measure the ring gear and you should get 9.5". It has to have those hubs like the one pictured above and have a 10.5" ring gear to be a 14 FF.

    Shawn
    87 K5
    few mods[​IMG]
     
  10. blazin72

    blazin72 1/2 ton status

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    Is this rearend better than a dana 60 and is it worth $125.00 should I hold off to find a FF?
    Blazin 72
     
  11. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I wouldn't go so far as to say its better than a Dana 60, but it is stronger than a 12 bolt. I would say its worth the $125. Just my opinion. Around here you can find a FF 14 for about the same money. The advantage of the SF 14 is ground clearance and weight. Its also probably easier to convert to 6 lug and keep the 15" wheels.

    Rene

    [​IMG]
     
  12. blazin72

    blazin72 1/2 ton status

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    What actually is the process of converting a 14 SF to 6 lug?
    I would like to keep my 15in. rims. If you have a 14 FF do you have to go to 16in?
     

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