14 bolts's in 67-72 C-Series??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69C-owner · 01-09-2012, 07:33 PM

Anyone runnin one of the big boys in their truck?
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Junkpyl · 01-09-2012, 11:16 PM

What are you trying to figure out? Will it swap? I have a 72 C30 cab chassis that I swapped a 14 bolt into in place of the eaton. It was a direct swap except for the shock mounts and a little finagling with the e brake cables. Coil sprung trucks will require new pads in place of the leaf perches. I don't know about the GMC version with the leafs if it will be a direct replacement or the possibility of moving the mounts. Hope this helps

1972K20 · 01-10-2012, 12:25 AM

I replaced my Eaton with a 14 Bolt and it's the best thing I did. You can't get parts for the Eatons. 14 Bolts are a lot more common.

**kwmech** · 01-10-2012, 04:07 PM

Same thing here, replaced the eaton with a 14 bolt and 3.42s in my longhorn. Didn't have to move the spring seats, but had a little fabrication with the shocks and parking brake cables

69C-owner · 01-10-2012, 04:59 PM

Is an "Eaton" a 12 bolt? If not how do I know if I have a Eaton or not?
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69C-owner · 06-18-2013, 01:23 AM

Ttt
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1972K20 · 06-18-2013, 01:30 AM

I can't remember the number of bolts on the inspection cover, but they have a "drop out" style third member kinda like a ford 9".

Here's a pic for reference:

69C-owner · 06-18-2013, 01:45 AM

So it has bolts on each side right? The inspection cover on the rear and the 3rduse member on the front
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1972K20 · 06-18-2013, 02:11 AM

Quote:

Originally Posted by 69C-owner

So it has bolts on each side right? The inspection cover on the rear and the 3rduse member on the front
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Yes

69C-owner · 06-18-2013, 02:15 AM

Well thats cool, didnt know those existed, if they were easier to get parts for id b on the hunt for one, already looking for too many hard to find parts already though
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farmall · 06-18-2013, 09:42 AM

What is the U-Joint situation? I just stripped an 82 C30 front and rear to swap into my 71 C30 Dually. I am going to do the whole crossmember swap in the front and change out the rear. Shocks are obvious but NAPA shows different #s for the U-Joint.

Don Quixote · 06-18-2013, 10:14 PM

For years, I ran a 14 bolt SF that I just swapped out in favor of the 14 bolt FF. I am letting someone else finangle the E-brake cables but even with the SF, I have to use conversion u-joints as I have the heavy duty driveline. If that's already done, it's a bolt-on. Even the SF was a good call but I pull a heavy trailer and where it had held up well, I just felt safer with the full-floater.

In short, it works and works very well.

lowrollin70gmc · 06-18-2013, 11:53 PM

I run a late model 11.5" 14 bolt in my k20. The extra width and strength is only a set of perches and shock mounts away.

Redline novdog · 06-19-2013, 08:55 AM

I'm in.I acquired a used "75 FF 14 bolt for free.Had been sitting for years.I had to throw away the drums ,backing plates,shoes wheel studs,etc... I hear that disc brake conversions on these are cheap and plentiful. I haven't gotten around to measuring width difference between '67 12 bolt and the 14 bolt. Mine won't be a bolt in with coils and track bar. I'm always looking for info,so if anyone has more please pile it on. Good thread!

**dennislbrooks** · 06-19-2013, 08:53 PM

I used 9.5 14 bolt from a 90 SS 454 in my 67 K10. relocated perches and used front gm 10 bolt shock mounts. Made a 6 lug from 5 on 5 with hub centric 1.5" spacers.

StepinNJ · 06-20-2013, 12:07 AM

..................

lowrollin70gmc · 06-20-2013, 01:46 AM

Quote:

Originally Posted by dennislbrooks

I used 9.5 14 bolt from a 90 SS 454 in my 67 K10. relocated perches and used front gm 10 bolt shock mounts. Made a 6 lug from 5 on 5 with hub centric 1.5" spacers.

You can also use a 9.5 14 bolt out of a K2500 (light duty 3/4) as they are a little wider and are six lug already.

Don Quixote · 06-20-2013, 09:43 AM

I'm sitting on an 8 lug 9.5" if you might be interested. The 8 lug is kind of rare and I ran it for years on my 72 without issue. I just upgraded to the 10.5"
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StepinNJ · 06-21-2013, 02:18 PM

Why is it a 14 bolt? I see 10.

1972K20 · 06-21-2013, 05:41 PM

Quote:

Originally Posted by StepinNJ

Why is it a 14 bolt? I see 10.

Post #12 shows a 14 bolt. It does have 14 bolts on the inspection cover.

Bigdav160 · 06-21-2013, 07:54 PM

The two other pics are Eaton axles. I think one has it's cover installed upside down.

01-09-2012, 11:16 PM	#2
Junkpyl Registered User Join Date: Jan 2007 Location: Scottsdale Arizona Posts: 125	Re: 14 bolts's in 67-72 C-Series??? What are you trying to figure out? Will it swap? I have a 72 C30 cab chassis that I swapped a 14 bolt into in place of the eaton. It was a direct swap except for the shock mounts and a little finagling with the e brake cables. Coil sprung trucks will require new pads in place of the leaf perches. I don't know about the GMC version with the leafs if it will be a direct replacement or the possibility of moving the mounts. Hope this helps

01-10-2012, 12:25 AM	#3
1972K20 Registered User Join Date: Nov 2010 Location: Alabama Posts: 741	Re: 14 bolts's in 67-72 C-Series??? I replaced my Eaton with a 14 Bolt and it's the best thing I did. You can't get parts for the Eatons. 14 Bolts are a lot more common.

01-10-2012, 04:07 PM	#4
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,641	Re: 14 bolts's in 67-72 C-Series??? Same thing here, replaced the eaton with a 14 bolt and 3.42s in my longhorn. Didn't have to move the spring seats, but had a little fabrication with the shocks and parking brake cables

01-10-2012, 04:59 PM	#5
69C-owner Registered User Join Date: Dec 2010 Location: Apison Tn Posts: 490	Re: 14 bolts's in 67-72 C-Series??? Is an "Eaton" a 12 bolt? If not how do I know if I have a Eaton or not? Posted via Mobile Device __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=43855069 LWB Fleet 1994 Buick Roadmaster 1994 GMC Sonoma

06-18-2013, 01:23 AM	#6
69C-owner Registered User Join Date: Dec 2010 Location: Apison Tn Posts: 490	Re: 14 bolts's in 67-72 C-Series??? Ttt Posted via Mobile Device __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=43855069 LWB Fleet 1994 Buick Roadmaster 1994 GMC Sonoma

01-09-2012, 07:33 PM	#1
69C-owner Registered User Join Date: Dec 2010 Location: Apison Tn Posts: 490	14 bolts's in 67-72 C-Series??? Anyone runnin one of the big boys in their truck? Posted via Mobile Device Posted via Mobile Device __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=43855069 LWB Fleet 1994 Buick Roadmaster 1994 GMC Sonoma

06-18-2013, 01:30 AM	#7
1972K20 Registered User Join Date: Nov 2010 Location: Alabama Posts: 741	Re: 14 bolts's in 67-72 C-Series??? I can't remember the number of bolts on the inspection cover, but they have a "drop out" style third member kinda like a ford 9". Here's a pic for reference:

06-18-2013, 01:45 AM	#8
69C-owner Registered User Join Date: Dec 2010 Location: Apison Tn Posts: 490	Re: 14 bolts's in 67-72 C-Series??? So it has bolts on each side right? The inspection cover on the rear and the 3rduse member on the front Posted via Mobile Device __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=43855069 LWB Fleet 1994 Buick Roadmaster 1994 GMC Sonoma

06-18-2013, 02:15 AM	#10
69C-owner Registered User Join Date: Dec 2010 Location: Apison Tn Posts: 490	Re: 14 bolts's in 67-72 C-Series??? Well thats cool, didnt know those existed, if they were easier to get parts for id b on the hunt for one, already looking for too many hard to find parts already though Posted via Mobile Device __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=43855069 LWB Fleet 1994 Buick Roadmaster 1994 GMC Sonoma

06-18-2013, 09:42 AM	#11
farmall Registered User Join Date: Jun 2011 Location: Central OR Posts: 730	Re: 14 bolts's in 67-72 C-Series??? What is the U-Joint situation? I just stripped an 82 C30 front and rear to swap into my 71 C30 Dually. I am going to do the whole crossmember swap in the front and change out the rear. Shocks are obvious but NAPA shows different #s for the U-Joint. __________________ 1955 GMC 250 8 Flatbed 1971 C30 157" 350 4spd 10' Flatbed 81 GMC K30 CnC 9' Flatbed 454 T400 89 GMC Jimmy Stock https://67-72chevytrucks.com/vboard/...d.php?t=810958 71 LT1 Convertible, 72 Coupe 69 CJ5, 75 CJ6, 67 M715, 72 M35A2 Bobbed, 95 XLC2

06-18-2013, 10:14 PM	#12
Don Quixote Registered User Join Date: May 2008 Location: Woodlawn, TN Posts: 275	Re: 14 bolts's in 67-72 C-Series??? For years, I ran a 14 bolt SF that I just swapped out in favor of the 14 bolt FF. I am letting someone else finangle the E-brake cables but even with the SF, I have to use conversion u-joints as I have the heavy duty driveline. If that's already done, it's a bolt-on. Even the SF was a good call but I pull a heavy trailer and where it had held up well, I just felt safer with the full-floater. In short, it works and works very well. __________________ Rocinante: 1972 GMC C25, 292, SM465, 14 bolt, power nothing, 440k and still handles my PCS moves Jorge: Kia Roller-skate with lots of buttons for the wife Wovoka: 2017 Indian Chief Vintage, better on gas but not much So far, this is the oldest I've ever been.

06-18-2013, 11:53 PM	#13
lowrollin70gmc Too many projects Join Date: Mar 2004 Location: Fargo, ND land of the flat hills Posts: 1,147	Re: 14 bolts's in 67-72 C-Series??? I run a late model 11.5" 14 bolt in my k20. The extra width and strength is only a set of perches and shock mounts away. __________________ Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" 70 GMC C1500 LWB My first truck: shaved, bagged, and more: the lowrollin70gmc 68 K20 Suburban 12V Cummins/NV5600/NP205/D60/11.5AAM 3.73s "Dakota Cadillac" 63 Chevy II Nova Coupe 250 I6/T56/4.56s "Economy car" 53 Willys Wagon 350/NV4500/BW4401/HP D44/9inch “Winter Wagon” 30 Model A 16 Focus ST

06-19-2013, 08:55 AM	#14
Redline novdog Registered User Join Date: Jan 2012 Location: Washington,Il Posts: 632	Re: 14 bolts's in 67-72 C-Series??? I'm in.I acquired a used "75 FF 14 bolt for free.Had been sitting for years.I had to throw away the drums ,backing plates,shoes wheel studs,etc... I hear that disc brake conversions on these are cheap and plentiful. I haven't gotten around to measuring width difference between '67 12 bolt and the 14 bolt. Mine won't be a bolt in with coils and track bar. I'm always looking for info,so if anyone has more please pile it on. Good thread! __________________ It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS

06-19-2013, 08:53 PM	#15
dennislbrooks Senior Member Join Date: Feb 2004 Location: Williamsburg, Ohio Posts: 1,798	Re: 14 bolts's in 67-72 C-Series??? I used 9.5 14 bolt from a 90 SS 454 in my 67 K10. relocated perches and used front gm 10 bolt shock mounts. Made a 6 lug from 5 on 5 with hub centric 1.5" spacers.

06-20-2013, 12:07 AM	#16
StepinNJ TuTone Silverado Join Date: Mar 2007 Location: Central NJ Posts: 196	Re: 14 bolts's in 67-72 C-Series??? .................. Attached Images __________________ 13 Corvette GS vert 13 Ram Laramie Longhorn 11 Wrangler Sahara unlimited 08 300 76 El Camino 67 Bel Air sedan 63 Corvette SWC 08 HD Road King Classic 68 HD Golf car



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06-20-2013, 09:43 AM	#18
Don Quixote Registered User Join Date: May 2008 Location: Woodlawn, TN Posts: 275	Re: 14 bolts's in 67-72 C-Series??? I'm sitting on an 8 lug 9.5" if you might be interested. The 8 lug is kind of rare and I ran it for years on my 72 without issue. I just upgraded to the 10.5" Posted via Mobile Device __________________ Rocinante: 1972 GMC C25, 292, SM465, 14 bolt, power nothing, 440k and still handles my PCS moves Jorge: Kia Roller-skate with lots of buttons for the wife Wovoka: 2017 Indian Chief Vintage, better on gas but not much So far, this is the oldest I've ever been.

06-21-2013, 02:18 PM	#19
StepinNJ TuTone Silverado Join Date: Mar 2007 Location: Central NJ Posts: 196	Re: 14 bolts's in 67-72 C-Series??? Why is it a 14 bolt? I see 10. __________________ 13 Corvette GS vert 13 Ram Laramie Longhorn 11 Wrangler Sahara unlimited 08 300 76 El Camino 67 Bel Air sedan 63 Corvette SWC 08 HD Road King Classic 68 HD Golf car

06-21-2013, 07:54 PM	#21
Bigdav160 Registered User Join Date: Apr 2011 Location: Klein Texas Posts: 3,852	Re: 14 bolts's in 67-72 C-Series??? The two other pics are Eaton axles. I think one has it's cover installed upside down. __________________ My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe

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