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Suburban 14FF

Discussion in 'The Garage' started by rlhenry, Apr 29, 2006.

  1. rlhenry

    rlhenry Registered Member

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    Does anybody know what years GM put 14-bolt full-floaters in Suburbans? I was under the impression that the vast majority of the 14-bolts in the 3/4 burbs was the semi-floater. I was cruising the junk yard the other day and found two different 2WD suburbans with full-floating 14-bolt axles. They looked to be late 70's to early 80's models.
     
  2. R77K10

    R77K10 Banned

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    mostly 73-81 or 82 would be FF,, then after that mostly SF

    evne in the pickups, alot of them tended to be SF in the 80s


    a late 70s has a whole differen front clip design than an early 80s does,

    huge difference, simple to spot



    good luck
     
  3. rdn2blazer

    rdn2blazer 1 ton status Premium Member

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    stay away from the 84/85 yr, they have the small pinion support bearing.
     
  4. AKbigsub

    AKbigsub 1/2 ton status Premium Member

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    My '81 k2500 burb had a SF14 and my '81 c2500 diesel had the FF14 bolt. Maybe the diesel is the determing factor?
     
  5. rlhenry

    rlhenry Registered Member

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    I agree, the front clip makes it easy to separate the two. The problem I had with these two is that there was no front clip left on either one. There wasn't much left of the interior either as some of the gauges and interior trim can also help to determine model year. They both had tailgates instead of barn doors, but those were offered in a vast range of model years.
     
  6. u2slow

    u2slow 1/2 ton status

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    AFAIK, you didn't get a 14FF in a 81-91 Burb unless it had a bigblock.

    That didn't stop me from swapping one into my '84 though. ;)
     
  7. yellowK20

    yellowK20 Well Lubricated Premium Member GMOTM Winner

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    I imagine it has more to do with the GVW than motor your 2wd probaly was rated heavier than the 4x4
     
  8. u2slow

    u2slow 1/2 ton status

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    Maybe more to do with a cobbled-together truck? ;) :D
     
  9. AKbigsub

    AKbigsub 1/2 ton status Premium Member

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    No, it came from the factory that way. !4 bolt FF with 4.10's. That axle is now undergoing the transformation to disc brakes. I have installed a detroit locker also. As soon as the brakes are done it will be going into the '90 burb:D
     
  10. u2slow

    u2slow 1/2 ton status

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    Naw... just giving you a hard time. :D I was thinking its either an '81 C1500 5.7L diesel, or an '82 C2500 6.2L diesel judging from dealer brochures anyways.
     
  11. tarussell

    tarussell 1/2 ton status

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    Just to add to the confusion of the "what motor determined what rear axle" issue I'll add to it.

    I had a neighbor ( oold man who bought his Burb new ) that had a 1990 4x4 Burb 6.2 / TH400-241 with a 14FF in it. I assume that the rear axle was as delivered from GM since this guy was a one owner.

    Now to add to the confusion, I came across another Burb almost identical 1990 4x4 GMC Burb TH400-241 / 6.2 (with the Banks kit that GM offered for a few years ) and it had the semi-floater in it.

    The "old man" Burb had 4.10 gears and the "Banks Burb" had 3.73's - those seemed to be the only differences between the two.

    I dunno...... Tom
     

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