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14bff vs. 14bsf - driveshaft length?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by kpanza, May 6, 2002.

  1. kpanza

    kpanza 1/2 ton status

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    My brother's rear end in his 89 Burb is making the dreaded Gov-Lock death noises and clunks! He was thinking of swapping in a 14bff in place of his current 14bsf (he has a 2500 Sub 2WD, 8 lug). What, if any, is the driveshaft length difference between the two rear ends - in other words, is one pinion longer than the other? They use the same u-joints, don't they?

    Thanks
     
  2. thatK30guy

    thatK30guy 1 ton status Premium Member

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    They will be the same length. U-joints should be the same also.
     
  3. kpanza

    kpanza 1/2 ton status

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    Thanks, I appreciate it!
     
  4. Triaged

    Triaged 1/2 ton status

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    Matt swaped out his 14sf for a 14ff just a few months ago and had no problems (other than the sheared center pin in the sf that prompted the swap).
     
  5. kpanza

    kpanza 1/2 ton status

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    Oh yeah, that's right, Matt did it... Cool, I will let my brother know this...
     
  6. Diesel Dan

    Diesel Dan 1/2 ton status

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    I just finished swapping in a 10.5" FF inplace of the 9.5" SF. Vehicle is my '88 3/4 ton 4x4 suburban. The 10.5 has a SHORTER pinion than the 9.5" axle. I must have an extra 1-1.5" showing on my slip now than befor, kinda surprised me.
     
  7. kpanza

    kpanza 1/2 ton status

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    Hmmm...that is interesting! Well, I will take your word for it, since we are talking about the exact situation that my brother would be looking at...except for the 4wd part, but close enough.

    I must be working too hard, since I totally forgot something! I could have just measured MY REAR 14BFF and compared it to his! Jeez...sometimes I wonder! ha,ha /forums/images/icons/smile.gif

    Thanks!
     

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