12 bolt??
+2
73ss
77cruiser
6 posters
G3GM :: G3 Tech :: Engine & Driveline
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12 bolt??
http://akroncanton.craigslist.org/pts/5280651657.html
I found this interesting. It has been published in many magazines, etc that 1972 was the last year for a 12 bolt rear. '73's & up have a 10 bolt. This is on CL. I bought some parts from this guy and as the pictures show it has 12 bolts on the cover. I did not see the rear for myself as the car was in another location. I have never seen one of these in a '73 & up. It does not look to be modified and I personally know that a 12 bolt will not bolt in without mods. I've tried it. The control arms do not line up. Maybe this was swapped in and the pictures show too much grime? Who knows. A popular misconception is just because it has 12 cover bolts does not necessarily mean it is a 12 bolt. The 12 bolt term refers to the number of ring gear bolts attaching it to the carrier.
Has anyone ever seen a '73 with a factory 12 bolt? This carcass in the pics is a factory 454/4-spd. I scrapped a 74 with a 454/4-spd & it was a 10 bolt 3.42 gear.
I found this interesting. It has been published in many magazines, etc that 1972 was the last year for a 12 bolt rear. '73's & up have a 10 bolt. This is on CL. I bought some parts from this guy and as the pictures show it has 12 bolts on the cover. I did not see the rear for myself as the car was in another location. I have never seen one of these in a '73 & up. It does not look to be modified and I personally know that a 12 bolt will not bolt in without mods. I've tried it. The control arms do not line up. Maybe this was swapped in and the pictures show too much grime? Who knows. A popular misconception is just because it has 12 cover bolts does not necessarily mean it is a 12 bolt. The 12 bolt term refers to the number of ring gear bolts attaching it to the carrier.
Has anyone ever seen a '73 with a factory 12 bolt? This carcass in the pics is a factory 454/4-spd. I scrapped a 74 with a 454/4-spd & it was a 10 bolt 3.42 gear.
73ss- G3GM Enthusiast
- Street Cred : 11
Re: 12 bolt??
Look at the 2nd pic the arms look to be at a weird angle.
http://images.craigslist.org/00I0I_fXLJBIhM5BQ_600x450.jpg
http://images.craigslist.org/00I0I_fXLJBIhM5BQ_600x450.jpg
77cruiser- G3GM Member
- Street Cred : 0
Re: 12 bolt??
Man is that car rusty on the bottom. Someones been messing with the hard brake lines on it. And (just going by the pics) the upper control arms look longer than our cars came with. Good pic 77cruiser !! Thats the pic that caught my attention.
I know the lower arms from earlier years interchange with ours. But the upper arms are different.
I'm willing to bet someone either switched the shock mounts from our years to an earlier axle. Or pressed our axle tubes into an earlier ham.
But looking at the second pic, the top of the ham (not the greasy bottom) and upper control arm bushing ear look very "rust free" as opposed to the rest of the rear/springs/axle tubes/crossmember brake line area. These areas have the same heavy rust on them. The upper ham does not.
I know the lower arms from earlier years interchange with ours. But the upper arms are different.
I'm willing to bet someone either switched the shock mounts from our years to an earlier axle. Or pressed our axle tubes into an earlier ham.
But looking at the second pic, the top of the ham (not the greasy bottom) and upper control arm bushing ear look very "rust free" as opposed to the rest of the rear/springs/axle tubes/crossmember brake line area. These areas have the same heavy rust on them. The upper ham does not.
Joe73- Donating Member
- Street Cred : 83
Re: 12 bolt??
yeah pic #2 does look a bit off. I was trying to see if there were any welds on the arms.
73ss- G3GM Enthusiast
- Street Cred : 11
Re: 12 bolt??
73ss wrote:
Has anyone ever seen a '73 with a factory 12 bolt? This carcass in the pics is a factory 454/4-spd. I scrapped a 74 with a 454/4-spd & it was a 10 bolt 3.42 gear.
My '74 454/TH400/3.42 also came with a 10 bolt.
I've run that same rear axle for 38 years (it is still in the car).
K
Keith Seymore- G3GM Member
- Street Cred : 11
Re: 12 bolt??
Someone here (joe73 i think) had once posted a link to a eBay auction where there was a adapter to mount a 12 bolt cover on a 10 bolt rearend.
dynchel- Donating Member
- Street Cred : 40
Re: 12 bolt??
Yes, that was me. But I think tbe rear in that car was fabbed.
Joe73- Donating Member
- Street Cred : 83
Re: 12 bolt??
http://www.g3gm.com/t6708-this-is-cheesy#58352 I found it, not currently available
dynchel- Donating Member
- Street Cred : 40
Re: 12 bolt??
dynchel wrote:... a adapter to mount a 12 bolt cover on a 10 bolt rearend.
What would be the motivation for this? (just "looks")?
K
Keith Seymore- G3GM Member
- Street Cred : 11
Re: 12 bolt??
Probably, or to claim ignorance when you sell a :72 chevelle with a 10 bolt that looks like a 12 bolt & say "I didn't touch it, it was like that when I bought it"
dynchel- Donating Member
- Street Cred : 40
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