14 bolt SF/FF questions

[benchseat4speed]

What year did GM replace the 14FF with the 14SF in 3/4 ton single wheel trucks and suburbans? What is most common u-joint size on a 14FF, 1350? Thanks, Kevin

 

[MTBLAZER89]

I believe it was somewhere in the 78-81 era when the SF's started showing up in the 3/4 tons. Nothing is exact with GM though. They had a lot of overlap in all of their changes in those years. Yeah 1350 is the 14BFF joint

 

[AV8]

I believe the change occured between 82-83.

 

[big83chevy4x4]

81 was the first year of the 14bsf. the diesel and bigblock 2wd 3/4 tons got a 14bff, all the other 3/4 tons got a sf

 

[2500SWATBurb]

1984 was first year for SF in 3/4 Tons..

 

[AV8]

Well, my 83 Suburban has a 14sf. I think they mixed them up a little back then, I've seen some with FF and some with SF.

 

[2500SWATBurb]

For Suburbans anyway. Not sure about any other applications.

 

[2500SWATBurb]

Well, my 83 has a 14sf. I think they mixed them up a little back then, I've seen some with FF and some with SF.

What kind of truck is your 83?

 

[AV8]

It is a Suburban.

 

[2500SWATBurb]

Shows how much I know!

What part of NC are you from?

 

[AV8]

I'm in Winston Salem....you?

 

[2500SWATBurb]

Near Asheville

 

[u2slow]

81 was the first year of the 14bsf. the diesel and bigblock 2wd 3/4 tons got a 14bff, all the other 3/4 tons got a sf

I agree with '81, and bigblock... but my '84 C20 Burb w/diesel had a 14SF stock.

 

[big83chevy4x4]

I agree with '81, and bigblock... but my diesel had a 14SF stock.

i though the 2wd diesels got the ff, but i could be wrong on that part. i know the BBC got the ff

 

[fireplug]

i though the 2wd diesels got the ff, but i could be wrong on that part. i know the BBC got the ff

Subs never came with a 14bff only one ton trucks did. 1/2 tons had 10 bolts, maybe 12bolts at some point in production others will know better. 3/4 ton had 14bsf.

Right?

 

[mrhoes]

all I know is that in 3/4 tons they switched them back and forth, some had the SF and some had the FF. just look and then you will be 100% sure.

 

[dyeager535]

all I know is that in 3/4 tons they switched them back and forth, some had the SF and some had the FF. just look and then you will be 100% sure.

I'm sure it was based on the GVW, just like '88+ 3/4 ton pick ups.

 

[u2slow]

Subs never came with a 14bff... Right?

Nope. Assuming 81-91 context... 3/4-ton Subs used the 14bFF with the 454, otherwise the 14bsf.

Here's the '81 pickup spec sheet:
http://brochures.slosh.com/1981/pickups20.jpg

 

[76zimmer]

Ditto, a neighbor has a 94 with a FF, big block