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14b sf to 14b ff swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by fireinthehole, Aug 12, 2003.

    When I find another 14b ff to put under my Sub, it should bolt right up to the stock u-joint right? I have a 3/4 ton Sub with the sf 14b now.

    Now I just need to find another one with 4.10's.

  1. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

    Jun 23, 2001
    Likes Received:
    my garage, Henderson, NV
    yepp it will bolt right in all you need in new u-bolts. the brake lines on my 3/4 ton sub hooked right up but my 14bff was older than my sub so the e-brake didnt work. /forums/images/graemlins/burb.gif
  2. Yeah, thats what I thought. The last time I did this swap it was 10b to 14b and the e-brake cable mount had to be fabbed up. So, do you have your e-brake hooked up yet?
  3. Eric M.

    Eric M. 1/2 ton status

    Dec 10, 2001
    Likes Received:
    Oakland, CA
    Make sure that 14 Bolt FF if off a 3/4 ton and not a 1 ton or you will need to relocate your shock mounts and spring pads. Also, pay attention to the parking brake set up, I found a set up that was compatible with my 91 Burb. There are several different parking brake set ups as they changed through the years. You should be able to find a 14 Bolt FF with a matching set up for your rig. It gets expensive to track down the correct parts after the install.

    Good Luck,

    Eric M.
  4. txbartman

    txbartman 1/2 ton status

    Jun 1, 2001
    Likes Received:
    Plano, TX
    You may also have driveshaft length issues. I just swapped a 14BFF under my K20 in place of my 14BSF. The pinion snout on the 14BFF was 5" shorter than that of the 14BSF. Had to lengthen the driveshaft accordingly.

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