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Need help with new truck

Discussion in 'The Garage' started by 53chevy, Jan 20, 2005.

  1. 53chevy

    53chevy 1/2 ton status Premium Member

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    HI, i just got a 84 GMC 1 TOn with 12 inch lift and 39.5 boggers. It has 5.13 gears in the 14 bolt in the rear. How do i tell what gear ring size and if it is FF or Fs axle. Reason i need to know is i need new rear brakes and want to do a rear disk conv. Thanks for your help
     
  2. mikey_d05

    mikey_d05 1 ton status GMOTM Winner

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    Well, if your cover has the same shape as this:
    [​IMG]
    then it's a 14 bolt full float. The ring gear size is 10.5". If the cover is more of an oval shape, it's a semi float axle and the ring gear diameter is 9.5". Another way to tell is by looking at the hubs. If there are 8 bolts on the end of the hub, it's a 10.5" full floater.
     
  3. divorced

    divorced 3/4 ton status

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    A 14 bolt FF has 8 bolts that go through the axle flange into the hub. This is not my pic, I grabbed it from the web.

    [​IMG]
     
  4. K5MONSTERCHEV

    K5MONSTERCHEV 1/2 ton status

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    Sounds sick man!! Wheres pics. It most likely has a FF.
     
  5. rjfguitar

    rjfguitar 3/4 ton status GMOTM Winner

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    If it is infact a 1 ton from the factory it will be a 14BFF unless it was swapped out for some reason. Just look for the large hubs sticking out of the center bore of the rim. Like pictured above.
     

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