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02-19-2012, 05:52:30 PM
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#1
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Member
Join Date: Feb 2012
Location: west monroe, Louisiana
Posts: 74
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What is a 41/12 ring and pin ratio
Hey i just took off the cover on a gm 10 bolt that was given to me and the big ring gear was 41 and the small one going to the driveshaft was 12. If you divide that is is 341.66 , is that actually a 342 ratio. It came from a 76 formula one firebird. The axels turn opposite from each other on each hub. What do i have. I currently have 41/15 in 71 RS rear behind a 415 BB. M20 tranny. I have never driven the car yet. http://i1058.photobucket.com/albums/...P8030100-2.jpg |
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02-19-2012, 05:56:14 PM
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#2
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Member
Join Date: Feb 2012
Location: west monroe, Louisiana
Posts: 74
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02-19-2012, 06:06:26 PM
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#3
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L. G. M. / Moderator
Join Date: Jun 2002
Location: out and about...
Posts: 9,686
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That's a 3.42, sounds like an open differential, too, not posi.
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02-19-2012, 06:10:42 PM
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#4
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Lifetime Gold Member
Join Date: Aug 2002
Location: Gods country in the beautiful Sierra Mountains of California
Posts: 11,611
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Welcome to the site gorilla, nice looking motor ya have there. Love the color of the sub-frame.
As Todd said, 3.42 open, get a Eaton posi for it and it will work fine behind that BBC, a marked improvement over the 2.73 you have.
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02-19-2012, 06:32:39 PM
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#6
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Lifetime Gold Member
Join Date: Aug 2002
Location: Gods country in the beautiful Sierra Mountains of California
Posts: 11,611
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Quote:
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Originally Posted by big gear head
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gorilla, Freddie ^^ (bgh) is da-man when it comes to differentials for our cars (and many other for that matter). |
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02-19-2012, 06:34:28 PM
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#7
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Member
Join Date: Feb 2012
Location: west monroe, Louisiana
Posts: 74
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thank you for the info. I powdercoated the subframe a Silver Vain color, cant tell but its actually silver with black hammer tone effects in it.
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02-19-2012, 06:53:42 PM
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#8
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Lifetime Gold Member
Join Date: Aug 2002
Location: Gods country in the beautiful Sierra Mountains of California
Posts: 11,611
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I did mine with Rustoleum hammered silver and got a lot of compliments on it. (While I had it that is)
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02-19-2012, 06:56:42 PM
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#9
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Member
Join Date: Feb 2012
Location: west monroe, Louisiana
Posts: 74
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very nice , what you mean, you dont have the car anymore.
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02-19-2012, 06:58:05 PM
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#10
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Member
Join Date: Feb 2012
Location: west monroe, Louisiana
Posts: 74
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So could i just swap out the ring and pin from 273 to 342 and leave open temp. until i buy a posi to install. will it work ok.
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02-19-2012, 07:00:21 PM
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#11
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Member
Join Date: Feb 2012
Location: west monroe, Louisiana
Posts: 74
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I have been living on a Cop budget for many years, that's why it has taken me two years to get to this point. Just changed career mode. Making more money so now i can go on with it. Plan anyway.
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02-19-2012, 07:03:00 PM
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#12
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Lifetime Gold Member
Join Date: Aug 2002
Location: Gods country in the beautiful Sierra Mountains of California
Posts: 11,611
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Yeah, I sold it with little regret, I spend a lot more time with my kids since I got rid of it. And Yes, you can swap out the ring and pinion and drive it but I would recommend the Eaton while yer doing it. Freddie can get ya a good deal on it. Shoot him a pm if he doesn't reply here. Its guys like him that make this the best forum on the net!
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