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02-18-2008, 09:18 AM
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#1 |
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Registered User
 Join Date: Jul 2007
Location: slc, ut
Posts: 318
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HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
I need to know quickly if a 12 bolt out of a 68 is a different width than a 72 12 bolt???
I am trying to get my chassis done for the car show on the 27th of Fed and I think my axles are too long. Please help thanks for any insight you can shed in advance. |
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02-18-2008, 09:25 AM
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#2 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
the 72 would be about 3/8 inch wider on each side.
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02-18-2008, 09:26 AM
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#3 |
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The Older Generation
  
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,891
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
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72 is about 3/4" wider on each side I believe..... LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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02-18-2008, 09:28 AM
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#4 |
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The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,891
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
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Well I only missed it by 3/8" on each side...  LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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02-18-2008, 09:32 AM
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#5 |
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Registered User
Join Date: Oct 2006
Location: Temecula,CA
Posts: 309
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
I have a 68 12 bolt. Since it is not as wide as a 72, does that allow me to run less back spacing for a deeper wheel?
__________________
Nick Old pic of my 72: http://img340.imageshack.us/my.php?image=img0435co5.jpg 04 Silverado Daily Driver 68 GMC short step http://67-72chevytrucks.com/vboard/s...d.php?t=379665 "I'll beat you to the gas station!!"  
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02-18-2008, 09:45 AM
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#6 | |
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Registered User
Join Date: Jan 2006
Location: Cherry Valley,Ca
Posts: 468
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
Quote:
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02-18-2008, 09:49 AM
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#7 |
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Registered User
Join Date: Jul 2007
Location: slc, ut
Posts: 318
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
So Longhorn man. In theory if I bought axles, say from superior axle for a 72, the surface that the bearing rides on should be enough and it should all be fine to use the 68 rearend. Right???
Oh I have been meaning to post some picts of a 70 Longhorn that I bought out of Boise but have just been to busy. You will know it when it is up. A beautiful blue with a white top. Thanks again |
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02-18-2008, 12:03 PM
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#8 |
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"Junkyard Dog"
Join Date: Jan 2008
Location: Springfield Oregon
Posts: 2,527
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
The 71-72 axle will not work in the 67-70 rear end. Even if the bearing surface was wide enough it would move the brake drum out the difference in the width. As I recall the difference is more like one inch per side.
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02-18-2008, 12:42 PM
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#9 | |
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Registered User
Join Date: Oct 2006
Location: Temecula,CA
Posts: 309
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
Quote:
__________________
Nick Old pic of my 72: http://img340.imageshack.us/my.php?image=img0435co5.jpg 04 Silverado Daily Driver 68 GMC short step http://67-72chevytrucks.com/vboard/s...d.php?t=379665 "I'll beat you to the gas station!!"
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02-18-2008, 07:27 PM
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#10 |
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Senior Member
Join Date: Apr 2005
Location: Joppa, Maryland
Posts: 4,408
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
Rear end for a late 70 on back is 56" and the late 70 thru 72 is 57 1/2" wide. If using the wider axles in the early housing, you also have to use the late 70, 71/72 backing plates, brakes and brake drums. There have been a number of threads on this subject. Try a search for more info.
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1997 GMC Sierra Ext 1965 Mustang |
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02-18-2008, 10:20 PM
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#11 |
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its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,690
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Re: HELP!!!!!!!!!! Is a 68 12 bolt a different width than a 72 12 bolt???
personally, I wouldn't even consider running the wider axles in the narrow brum. But it seems planty have done it and got away with it.
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