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1991 14 bolt FF

suntadz

suntadz

1/2 ton status
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May 15, 2005
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bay area, ca
Hey- Ive done some research and it seemed to me that this would fit a 1987 truck but would take some modifications. I also wasnt sure if these years were a FF or SF. I had a guy on the phone claim it was a direct bolt up to my truck and a FF out of a 1991 3/4 ton truck. When i told him i wasnt sure if it was FF and didnt think it was a direct fit he kinda got mad at me and told me I didnt now much about chevy trucks. (which is true but he doesnt know that). Anyway I was looking for a 14 FF direct fit for my truck and was under the impression a 1973-1981 3/4 would be a direct fit. Trying to do so without being ripped off either. I do not know how to weld and was trying to do it all in the driveway so a direct fit was kinda important to me. Can anyone let me know if I am wrong? This guy kinda rattled me and made me doubt myself. thanks
robb
 
It could be either a full float or semi-float in that year. As for the direct fit, no. That is out of an IFS era rig and the spacing of the spring perches and shock mounts are probably different.

Edit: If it is a 91 suburban you set, as those didn't change until 1992.
 
In 1991, it could be out of a 3/4 ton Suburban, 1 ton crewcab, or 3/4 or 1 ton newer bodystyle pickup. Out of the 3, the only one that will be a direct bolt-in is the one from a 3/4 Suburban, BUT it will be a 14sf, NOT a 14ff. The guy was trying to hose you. Look elsewhere.
 
BigEasy said:
the only one that will be a direct bolt-in is the one from a 3/4 Suburban, BUT it will be a 14sf, NOT a 14ff.
Click to expand...

A 2wd could easily have the 14ff.

The 88+ IFS trucks used the FF with the 454 or 6.5TD in 3/4-tons, and (obviously) the 1-tons.

Full-float:
srw_hub.jpg


semi-float:
axle_flange.jpg
 
u2slow said:
A 2wd could easily have the 14ff.

The 88+ IFS trucks used the FF with the 454 or 6.5TD in 3/4-tons, and (obviously) the 1-tons.
Click to expand...

I agree they can be found in either a 4wd's or 2wd's. I never said 4wd's only. :wink1:
 
I know that the FF is obviously preferable (not just the full floating portion, but the extra size on the Ring gear), but is the Semi FLoat 14 bolt worth keeping? How does a Semi Float compare to, say a 44 rear or an 8.8? I know you can get lockers for both.

Thoughts?
 
Just look for a 79 k30 pickup and that would bolt right in
Click to expand...

I thought the k30 had different shock or spring mounts I would have to alter but the k20 would be the only one to bolt right up.
 
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