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#1 |
Registered User
Join Date: Dec 2010
Location: Apison Tn
Posts: 490
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14 bolts's in 67-72 C-Series???
Anyone runnin one of the big boys in their truck?
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http://67-72chevytrucks.com/vboard/s...d.php?t=438550 ![]() ![]() 1994 Buick Roadmaster 1994 GMC Sonoma |
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#2 |
Registered User
![]() Join Date: Jan 2007
Location: Scottsdale Arizona
Posts: 125
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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
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#3 |
Registered User
Join Date: Nov 2010
Location: Alabama
Posts: 739
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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.
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#4 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,526
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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
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#5 |
Registered User
Join Date: Dec 2010
Location: Apison Tn
Posts: 490
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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?
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http://67-72chevytrucks.com/vboard/s...d.php?t=438550 ![]() ![]() 1994 Buick Roadmaster 1994 GMC Sonoma |
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#6 |
Registered User
Join Date: Dec 2010
Location: Apison Tn
Posts: 490
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Re: 14 bolts's in 67-72 C-Series???
Ttt
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http://67-72chevytrucks.com/vboard/s...d.php?t=438550 ![]() ![]() 1994 Buick Roadmaster 1994 GMC Sonoma |
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#7 |
Registered User
Join Date: Nov 2010
Location: Alabama
Posts: 739
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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: |
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#8 |
Registered User
Join Date: Dec 2010
Location: Apison Tn
Posts: 490
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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
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http://67-72chevytrucks.com/vboard/s...d.php?t=438550 ![]() ![]() 1994 Buick Roadmaster 1994 GMC Sonoma |
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#9 |
Registered User
Join Date: Nov 2010
Location: Alabama
Posts: 739
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Re: 14 bolts's in 67-72 C-Series???
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#10 |
Registered User
Join Date: Dec 2010
Location: Apison Tn
Posts: 490
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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
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http://67-72chevytrucks.com/vboard/s...d.php?t=438550 ![]() ![]() 1994 Buick Roadmaster 1994 GMC Sonoma |
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#11 |
Registered User
Join Date: Jun 2011
Location: Central OR
Posts: 702
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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.
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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 |
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#12 |
Registered User
Join Date: May 2008
Location: Woodlawn, TN
Posts: 275
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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.
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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. |
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#13 |
Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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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.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
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#14 |
Registered User
![]() Join Date: Jan 2012
Location: Washington,Il
Posts: 632
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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!
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It builds on my intelligence when I make a mistake, Boy am I building on it! '67 C-10,'70 Nova SS ![]() |
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#15 |
Senior Member
![]() Join Date: Feb 2004
Location: Williamsburg, Ohio
Posts: 1,780
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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.
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#16 |
TuTone Silverado
![]() Join Date: Mar 2007
Location: Central NJ
Posts: 196
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Re: 14 bolts's in 67-72 C-Series???
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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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#17 |
Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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Re: 14 bolts's in 67-72 C-Series???
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.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
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#18 |
Registered User
Join Date: May 2008
Location: Woodlawn, TN
Posts: 275
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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"
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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. |
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#19 |
TuTone Silverado
![]() Join Date: Mar 2007
Location: Central NJ
Posts: 196
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Re: 14 bolts's in 67-72 C-Series???
Why is it a 14 bolt? I see 10.
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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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#20 |
Registered User
Join Date: Nov 2010
Location: Alabama
Posts: 739
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Re: 14 bolts's in 67-72 C-Series???
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#21 |
Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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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.
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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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