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1975 14bff carrier?

Discussion in 'The Garage' started by gone huntin, Apr 2, 2005.

  1. gone huntin

    gone huntin 1/2 ton status Premium Member

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    What type of locking unit would this be? What type of lubricant does it require? Asking for a friend that just aquired this truck.
     
  2. Eric M.

    Eric M. 1/2 ton status

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    You'll need to know what locker is in it (assuming from your post is isn't an open dif.) and then you can determine the type of gear oil you need.


    Eric M.
     
  3. gone huntin

    gone huntin 1/2 ton status Premium Member

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    From pics. I've seen on ebay, it's a gov-lock.
     
  4. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Well no matter what posi, 80-90w and limited slip fluid, friction modifier, whatever.
     
  5. gone huntin

    gone huntin 1/2 ton status Premium Member

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    There is a TSB from GM saying NOT to use a friction modifier in the rear diff. containing a G80 in 10 bolts like in my 'burb. It states that using the friction modifier will cause pre-mature wear.
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    That is correct. Gov-locks DO NOT use limited slip additive.
     
  7. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Since when? Where did you learn this?
     
  8. Blazer1970

    Blazer1970 1/2 ton status

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    Since Eaton started making them in the mid '70s.


    Here is a quote from a post on the diesel page where someone e-mailed Eaton for info on this:

     
  9. gone huntin

    gone huntin 1/2 ton status Premium Member

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    Then he should use regular 80w90 in it then? That's what I was thinking, but I wanted to hear it from someone else too. I went to look it up in my ALL-DATA, but it only goes back to '82.
     
  10. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Ahh, well there not that great anyway.
     

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