14bff vs. 14bsf - driveshaft length?

[kpanza]

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

 

[thatK30guy]

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

 

[kpanza]

Thanks, I appreciate it!

 

[Triaged]

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).

 

[kpanza]

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

 

[Diesel Dan]

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.

 

[kpanza]

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!