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Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> 12 bolt ring bolts
Post Info TOPIC: 12 bolt ring bolts
SGS Welding


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12 bolt ring bolts
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Do you reuse the factory bolts if they look perfect?

Or get new ones? If the answer is new what manufacturer? Part number?

Thanks



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67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 
4SPEED427


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I'm not sure what others here will say but I've never installed new ones, and never seen a broken one. This is just for a street car, not a drag car?

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
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cdnpont


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I'd reuse them unless you'll be drag racing.

Or change them anyway for peice of mind,

https://www.summitracing.com/parts/arp-230-3001



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
SGS Welding


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As long as they look great when they come out

I would think to reuse them BUT when I watched 

the Haggerty 12 bolt rebuild video Damian (I thats his name)

ordered the wrong bolts then ordered the right ones I think 

anyways my point being just wasnt sure what was accepted 

practice

 I have all the parts now for the 3.42 Detroit Locker upgrade

and just got to thinking about the ring bolts?

Thanks for the advice!



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67 Parisienne Convertible 

67 Parisienne 2 Door Hardtop 
cdnpont


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I reused them in my 2 12 bolts no probs with Eaton style carriers. Maybe certain carriers need a special shoulder on the bolt?



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 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
4SPEED427


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SGS Welding wrote:

 

 I have all the parts now for the 3.42 Detroit Locker upgrade

 

 3.42 is a really nice compromise gear. 3.31 is on the tail end of performance and 3.55 is getting a bit much for high speed highway driving (unless you have overdrive). It's a shame GM never made 3.42 for the passenger car 12 bolt diff.



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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
1965CS


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4SPEED427 wrote:

 

 3.42 is a really nice compromise gear. 3.31 is on the tail end of performance and 3.55 is getting a bit much for high speed highway driving (unless you have overdrive). It's a shame GM never made 3.42 for the passenger car 12 bolt diff.

 Interesting, that they didn't have it. But, agreed on the 3:42 for best overall - I changed from the 3:31 to 3:42 and it made all the difference by eliminating a slight lag in the OD (700R4)



-- Edited by 1965CS on Thursday 11th of March 2021 10:24:45 PM

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a421cat


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3.42 ratio was available on american Pontiacs. Eaton 8 7/8 12 bolt diff with a 10 bolt cover. 1965-70.

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4SPEED427


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And once they came out with the 8 1/2" in GM's early 70's vehicles it was a very popular gear.

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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles 

1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
see2xu


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The tensile strength degrades after theyre first torqued, but as long as they arent subjected to loads outside of typical street driving, reusing them wont be a problem.

If the engines been juiced, or the car will be track- or street raced, fresh Grade 8 bolts are cheap insurance.



-- Edited by see2xu on Thursday 11th of March 2021 09:58:02 PM

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see2xu

66 Beau 2DHT 427FI, 700R
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