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ff or sf

Discussion in 'The Garage' started by lifted95z71, Apr 30, 2003.

  1. lifted95z71

    lifted95z71 1/2 ton status

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    Location:
    birmingham alabama
    how do you tell the ff from the sf? on a dana 60?
     
  2. Goober

    Goober 1/2 ton status

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    Mayberry (Auburn, WA)
    Dana made both full-floating and semi-floating rear versions of the Dana 60. All of the Dana 60's that you find on cars will be semi-floating. Dodge used them behind their 426 Hemi powered cars. The Dana 60's you find on trucks could be either but most of them I've seem were full floating axles.


    Front axles are full floating.



    One way to figure out if an axle housing is semi-floating or full-floating regardless of who makes it or what it's installed in is to just look at the axle shaft and how it is held in place.


    SEMI - FLOATING

    Most of the rear axles that you come across will have a flange on the end of them that has all your wheel lugs in it. The wheel bearings ride directly on or are pressed on the axle shaft and the axle has a grove on the differential end of it for a C-clip that holds the axle in place. The axle shaft is floating freely on the differential end but it is held tightly on the other end by a bearing. Having the bearing mounted to or riding on the axle shaft means that the shaft is supporting the weight of the vehicle. If the axle breaks it will come right out the end of the housing with the wheel still attached. At 60 mph on the freeway that makes for a wild ride (ask me how I know /forums/images/graemlins/blush.gif)




    FULL - FLOATING

    Many heavier duty axle shafts are held in place by a flange on the end that bolts directly to the hub. If you remove the bolts on that flange you can pull the axle shaft right out of the housing without even jacking the truck up. That’s because the axle shaft isn't supporting any of the weight of the truck. It's just floating through the hub and floating in the side gears in the differential. You don't need to have those goofy C-clips holding the axle in place because the bolts on the outer flange hold it in place. And the best part is that if you break an axle shaft while driving, everything stays in place!


    Does that make it easier?


    If someone could post some pictures, that would be cool.
     
  3. TXsizeK5

    TXsizeK5 1/2 ton status

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    Full Float 14bolt axle. Notice the hubs that stick out the side of the huge brake drum. [​IMG]

    This is showing the hub sticking out the side of the wheel...
    [​IMG]
    SemiFloat axle... sorry no good picture but you can notice how small the 10bolt is....
    [​IMG]
     

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