14B FF questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mkmiller1 · 05-19-2004, 10:28 PM

I'm looking for a 14 B FF for my '72. Is there any that will bolt in without having to move the spring perches? I've got a one in a '79 4x4 but the perches are wider on that one by a couple of inches. Give me some info if you can.
Thanks,
Matthew

drink2mny · 05-19-2004, 10:48 PM

I haven't heard of one.. I believe the 14bFF started in '73-'74

teeitup · 05-19-2004, 11:22 PM

Matthew, I got some 4.10's, 4.56's, and 3.73's 14 bolts up here. Do some trading on that swb 4x4 you have.

ryanroo · 05-20-2004, 01:00 AM

i have a 14 bolt ff in my 72 and it went in just fine, if you find one from the 1 ton trucks 73-87 they should fit with no perch mods.
Ryan

mkmiller1 · 05-20-2004, 11:36 AM

ryanroo-thanks for the info

teeitup-randy, let me know if you have any with 40" C to C spring perches. I'm needing this in 4.56 from a single rear wheel(SRW) truck to match the D60 going up front

. Also, I'd prefer an open carrier so I can put a detroit in. Now am I picky or what!!!!

If i can't find a SRW with correct perches, would it be easier to convert a dual rear to single or just move the perches?

Matthew

1969 GMC · 05-20-2004, 11:45 AM

if you find an axle from a dually truck, there's a good chance it is a dana 70. about the same as a 14 bolt, except 10 bolts on the diff cover vs 14.

Beast388 · 05-20-2004, 04:00 PM

The 14BFF that came in the 1-tons have a C to C distance of 40.5" Our old trucks have a C to C distance of 40". The 1-ton 14BBF will bolt in with a bit of prying on the springs. You will still need to move the shock mounts though.

I used a 3/4 ton 14BFF and just moved the perches and shock mounts.

teeitup · 05-20-2004, 04:38 PM

I'll try to look tonight Matthew.

Truckstuff · 05-20-2004, 07:24 PM

73-80 2wd 3/4Ton Crew cabs also have the narrow spring perches.

*1FaastC10* · 05-20-2004, 09:10 PM

Quote:

Originally Posted by 1969 GMC

if you find an axle from a dually truck, there's a good chance it is a dana 70. about the same as a 14 bolt, except 10 bolts on the diff cover vs 14.

since a C and C was mentioned, my C and C dually K30 is most defiitely a 14FF. D70s were mostly full width duallys, mine looks as if it would almost fit both tires behind stock fenders.

poff · 05-21-2004, 05:10 PM

FYI: If you end up with a '73 axle and you have a problem getting wheel cylinders, get '74 rear wheel cylinders. The '73 cylinders were only used for one year. The '74s take different lines but they are easier to find. Everything else should be the same. Also if you want to put a Detroit locker in it, make sure you get an open carrier not a posi.

mkmiller1 · 05-23-2004, 03:01 PM

Thanks for the info folks.

05-19-2004, 10:28 PM	#1
mkmiller1 Senior Member Join Date: Dec 2000 Location: Magnolia, Arkansas Posts: 1,091	14B FF questions I'm looking for a 14 B FF for my '72. Is there any that will bolt in without having to move the spring perches? I've got a one in a '79 4x4 but the perches are wider on that one by a couple of inches. Give me some info if you can. Thanks, Matthew __________________ GOD is good...All the time! '71 swb custom10 barn find-68K original miles 72 K5 CST rust bucket, but runs and drives 84K miles

05-19-2004, 10:48 PM	#2
drink2mny Registered User Join Date: Jun 2003 Location: spokane wa Posts: 2,189	I haven't heard of one.. I believe the 14bFF started in '73-'74 __________________ Support The Board

05-19-2004, 11:22 PM	#3
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	Matthew, I got some 4.10's, 4.56's, and 3.73's 14 bolts up here. Do some trading on that swb 4x4 you have. __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

05-20-2004, 01:00 AM	#4
ryanroo Senior Member Join Date: Apr 2004 Location: sw colorado Posts: 2,720	i have a 14 bolt ff in my 72 and it went in just fine, if you find one from the 1 ton trucks 73-87 they should fit with no perch mods. Ryan __________________ 72 K20 12v build 72 K20 "parts truck" A place for your diesel swap questions

05-20-2004, 11:36 AM	#5
mkmiller1 Senior Member Join Date: Dec 2000 Location: Magnolia, Arkansas Posts: 1,091	ryanroo-thanks for the info teeitup-randy, let me know if you have any with 40" C to C spring perches. I'm needing this in 4.56 from a single rear wheel(SRW) truck to match the D60 going up front . Also, I'd prefer an open carrier so I can put a detroit in. Now am I picky or what!!!! If i can't find a SRW with correct perches, would it be easier to convert a dual rear to single or just move the perches? Matthew __________________ GOD is good...All the time! '71 swb custom10 barn find-68K original miles 72 K5 CST rust bucket, but runs and drives 84K miles

05-20-2004, 11:45 AM	#6
1969 GMC Registered User Join Date: Feb 2003 Location: The Rubber City Posts: 5,498	if you find an axle from a dually truck, there's a good chance it is a dana 70. about the same as a 14 bolt, except 10 bolts on the diff cover vs 14. __________________ 1969 GMC K2500 1996 Honda Accord 2007 Kawasaki KLR 650

05-20-2004, 04:00 PM	#7
Beast388 Suburbans RULE! Join Date: Jan 2000 Location: Clinton, IA 52732 Posts: 689	The 14BFF that came in the 1-tons have a C to C distance of 40.5" Our old trucks have a C to C distance of 40". The 1-ton 14BBF will bolt in with a bit of prying on the springs. You will still need to move the shock mounts though. I used a 3/4 ton 14BFF and just moved the perches and shock mounts. Attached Images __________________ --Ben 71 GMC Suburban 4X4 The "Beast" 388 CID Stroker, TH350, NP205, 8-lug D44, 14BFF w/ Detroit, 4.10:1 gears, 4-Wheel Disks 4" Lift, 35" MT/R's.

05-20-2004, 04:38 PM	#8
teeitup Just like to part out trucks!! Join Date: Nov 2001 Location: Meriden, Ks-North of Topeka 10 miles Posts: 27,395	I'll try to look tonight Matthew. __________________ 67 Chev swb stepside 4x4 283 4 speed SOLD 72 blazer 4x4 4 speed Cheyenne 72 GMC swb 4x4 fleet 4 speed, original paint 1958 Cameo (one of 1405 built, it was my dads) 2020 chevy Apex 4x4 crew cab 1969 Z28 with the 302 1980 chevy swb 4x4 1964 chevell Malibu SS 1976 K20, sold new originally out of my dads chevy dealership Members that I've met, over 200 probably closer to 300 in the 12 years I've been on this site, everyone I met "It was a pleasure"

05-20-2004, 07:24 PM	#9
Truckstuff Registered User Join Date: Dec 2003 Location: Cloverdale, British Columbia Canada Posts: 159	73-80 2wd 3/4Ton Crew cabs also have the narrow spring perches. __________________ Real Trucks are Built not Bought Building: 1981 GM SB LowRider 1985 GM K3500 3+3 1981 GM K2500 SSB 1980 GM K2500 X-BC Hydro 1979 GM K3500 3+3 1976 GM K5 Blazer 1970 Custom 10 http://bc4x4.com/

05-21-2004, 05:10 PM	#11
poff Registered User Join Date: Dec 1999 Location: san diego, ca Posts: 546	FYI: If you end up with a '73 axle and you have a problem getting wheel cylinders, get '74 rear wheel cylinders. The '73 cylinders were only used for one year. The '74s take different lines but they are easier to find. Everything else should be the same. Also if you want to put a Detroit locker in it, make sure you get an open carrier not a posi. __________________ '70 K-20 San Diego, CA

05-23-2004, 03:01 PM	#12
mkmiller1 Senior Member Join Date: Dec 2000 Location: Magnolia, Arkansas Posts: 1,091	Thanks for the info folks. __________________ GOD is good...All the time! '71 swb custom10 barn find-68K original miles 72 K5 CST rust bucket, but runs and drives 84K miles



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