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I.D.ing 14bolt ff or sf?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Eric78K5, Dec 12, 2001.

  1. Eric78K5

    Eric78K5 1/2 ton status

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    Hey guys,
    I've located a 14 bolt rear axle on a utility-bodied 77 work truck. The guy has been parting the truck out, and I can pick up the 14 bolt for next to nothing. My question is this...how do you tell if it's a full-floating one or a semi-floating one?
    It's an eight lug model. It also has eight nuts on the end where the locking hubs go on my front axle. Thanks for the help.

    Eric78K5
    K5-Because Size Matters!
     
  2. Eric78K5

    Eric78K5 1/2 ton status

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    Also, can I bolt this up to an 89 model Jimmy with no changes, or am I going to have to move the shock mounts, etc?

    Eric78K5
    K5-Because Size Matters!
     
  3. 55Willy

    55Willy 3/4 ton status

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    If the pinion has 6 bolts that allow for the it to come out the front it is a full floater. Also as you mentioned there is a hub in the rear, that is the other clue it is a full floater.
    If it is a 3/4 ton truck it will bolt right in, if it is a 1 ton, then work is needed to make it fit.
    <font color=red>Life is like a mud hole:</font color=red><font color=blue>
    When the S#!T gets deep, you have to keep moving and friends can always pull you out</font color=blue>
    55 Willy's
     
  4. Blue85

    Blue85 Troll Premium Member

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    yes, the protruding hub with the bolts on it identifies it as a FF. Also look at the diff cover and refer to the axle identification guide in the tech section of this site.

    <font color=green>Oh man, 4:10's are sure better than 3.08's!</font color=green>
     
  5. 84_Chevy_K10

    84_Chevy_K10 Banned

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    It's a '77, if it's a 14 bolt, it's a full floater. Trucks didn't get the 14 bolt SF until 1982.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  6. 82GMC

    82GMC 1/2 ton status

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    Just a BTW Tim, They came around in 81 not 82[​IMG].

    I am the hunter Who live's in the darkness, And grows through your fears...... And you are the hunted.
     

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