14 bolt SF v 14 FF - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Hiluxxulih · 03-25-2011, 08:55 PM

What is the strength differences between the 14 bolt SF and the 14 bolt FF ? my 1986 Chevy K20 has a semi floating 14 bolt and was wondering if it as good as a full floater .

b454rat · 03-25-2011, 09:09 PM

Nope. Fine for normal use, but put big tires and go offroad, it go boom!!!!!

Hiluxxulih · 03-25-2011, 11:37 PM

Are there any easy lockers for the 14 bolt SF ? the truck is only going to have slightly bigger mud tires 265 or 285 probably .

wyattglock · 03-25-2011, 09:41 PM

The biggest difference other than ring gear size is, on a full floater you can take the axle out of the truck without pulling c-clips. They are both pretty bulletproof as far as diffs go.

ghettoluxury · 03-26-2011, 04:31 PM

Do your self the favor and get a full float!

Hiluxxulih · 03-26-2011, 05:24 PM

Quote:

Originally Posted by ghettoluxury

Do your self the favor and get a full float!

Are there any direct replacement 14 bolt FF for my truck ? I put one in my 1987 GMC R20 and it didn't have a parking brake because the cables would not work because it was out of a 77 Chevy pickup .

ghettoluxury · 03-26-2011, 05:46 PM

Quote:

Originally Posted by Hiluxxulih

Are there any direct replacement 14 bolt FF for my truck ? I put one in my 1987 GMC R20 and it didn't have a parking brake because the cables would not work because it was out of a 77 Chevy pickup .

Get one out of an 81-86 c/k20

justinburnett · 03-26-2011, 08:40 PM

how do you tell the difference?

b454rat · 03-26-2011, 08:41 PM

14ff has the hub sticking out inside the lug nuts, semi has nothing, like a 1/2 ton axle.

BigBlocksRule · 03-26-2011, 08:46 PM

Except directly at the splines, the semi-floater axles are bigger diameter than full floaters. Monstrous 33 splines, they're huge. You rock crawlers may have seen one, but I've never seen one break including some deep into the 9's.
There are a few lockers/posi's available, you can do a quick search.
Oh, and they're about 100lbs lighter than the full floater.
No need to swap one out until you've proven you have enough power to bust a SF, IMHO.

dropd80s · 03-27-2011, 08:54 PM

Quote:

Originally Posted by BigBlocksRule

No need to swap one out until you've proven you have enough power to bust a SF, IMHO.

I agree. But if you blow it up, throw it in the junk pile and get a FF.

justinburnett · 03-26-2011, 09:05 PM

Yay for me having a ff then. Also i found out A couple days ago I have a 205 instead or the 203 I thought I had.
Posted via Mobile Device

03-25-2011, 08:55 PM	#1
Hiluxxulih Registered User Join Date: Mar 2011 Location: Coos Bay , Oregon Posts: 272	14 bolt SF v 14 FF What is the strength differences between the 14 bolt SF and the 14 bolt FF ? my 1986 Chevy K20 has a semi floating 14 bolt and was wondering if it as good as a full floater . Last edited by Hiluxxulih; 03-25-2011 at 09:05 PM. Reason: bad spelling

03-25-2011, 09:09 PM	#2
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: 14 bolt SF v 14 FF Nope. Fine for normal use, but put big tires and go offroad, it go boom!!!!! __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

03-25-2011, 11:37 PM	#3
Hiluxxulih Registered User Join Date: Mar 2011 Location: Coos Bay , Oregon Posts: 272	Re: 14 bolt SF v 14 FF Are there any easy lockers for the 14 bolt SF ? the truck is only going to have slightly bigger mud tires 265 or 285 probably .

03-25-2011, 09:41 PM	#4
wyattglock Registered User Join Date: Jul 2010 Location: Lafayette, IN Posts: 622	Re: 14 bolt SF v 14 FF The biggest difference other than ring gear size is, on a full floater you can take the axle out of the truck without pulling c-clips. They are both pretty bulletproof as far as diffs go.

03-26-2011, 04:31 PM	#5
ghettoluxury Registered User Join Date: Apr 2009 Location: Waynesfield Ohio Posts: 1,991	Re: 14 bolt SF v 14 FF Do your self the favor and get a full float! __________________ 1949 Five Window, 1973 Step Side, 2000 Z71

03-26-2011, 08:40 PM	#8
justinburnett Registered User Join Date: Sep 2010 Location: The Dalles, OR Posts: 392	Re: 14 bolt SF v 14 FF how do you tell the difference?

03-26-2011, 08:41 PM	#9
b454rat Senior Member Join Date: May 2004 Location: Binghamton, NY Posts: 3,469	Re: 14 bolt SF v 14 FF 14ff has the hub sticking out inside the lug nuts, semi has nothing, like a 1/2 ton axle. __________________ 2000 GMC CCSB 454/4L80 6” lift SAS 1999 Chevy CCSB 454/NV4500 4” SAS 1999 GMC Yukon 350/4L60 6" SAS

03-26-2011, 08:46 PM	#10
BigBlocksRule Registered User Join Date: Jun 2008 Location: Lubbock, TX Posts: 2,047	Re: 14 bolt SF v 14 FF Except directly at the splines, the semi-floater axles are bigger diameter than full floaters. Monstrous 33 splines, they're huge. You rock crawlers may have seen one, but I've never seen one break including some deep into the 9's. There are a few lockers/posi's available, you can do a quick search. Oh, and they're about 100lbs lighter than the full floater. No need to swap one out until you've proven you have enough power to bust a SF, IMHO.

03-26-2011, 09:05 PM	#12
justinburnett Registered User Join Date: Sep 2010 Location: The Dalles, OR Posts: 392	Re: 14 bolt SF v 14 FF Yay for me having a ff then. Also i found out A couple days ago I have a 205 instead or the 203 I thought I had. Posted via Mobile Device

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