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10-21-2009, 06:55 PM | #1 |
James
Join Date: May 2008
Location: Dayton, WA
Posts: 455
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Whats my gear ratio in this gm 12 bolt???
I bought this GM 12 bolt from a guy for 20 bucks. Couldnt pass it up cause the price. So I got it home, cracked open the case and counted the teeth. RING 43 AND PINION 13. My problem here is I can't find this count on the chart I use. So I thought maybe one of you guys could help me. Thanks. The chart I have is all I have. See below.
http://www.drivetrain.com/parts_cata...d_pinions.html http://www.drivetrain.com/parts_cata...d_pinions.html
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10-21-2009, 07:08 PM | #2 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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Re: Whats my gear ratio in this gm 12 bolt???
normally you just divide the ring gear teeth by the pinion teeth which in your case comes out to 3.30 but i have never ever hears of that ratio in a 12 bolt. a recount might be in order. also there should be a stamp on the edge of the ring gear that will say the tooth count. the most common gear would be 3.07 which comes to 40-13
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. Last edited by cableguy0; 10-21-2009 at 07:09 PM. |
10-21-2009, 07:11 PM | #3 |
James
Join Date: May 2008
Location: Dayton, WA
Posts: 455
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Re: Whats my gear ratio in this gm 12 bolt???
Thanks. I'm pretty sure I have the right count. But I'll check again. I looked for stamps but didnt have a whole lot of time. It started to rain.
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10-21-2009, 07:37 PM | #4 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
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Re: Whats my gear ratio in this gm 12 bolt???
Is this a 12 bolt car rear? if it is it could have that gear from the factory i was thinking truck rears
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
10-21-2009, 08:34 PM | #5 |
James
Join Date: May 2008
Location: Dayton, WA
Posts: 455
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Re: Whats my gear ratio in this gm 12 bolt???
Yes. I do beleive it is a car rear. It is has five lug axles too. Kinda the main reason I bought it. I have a 12 bolt in my 66 pu. But it is a 4.11 (I think) and 6 lug. So I may use the gears and axles in my truck
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Never crush'em. Restor'em or recycle'em. The payoff is always worth it in the end. http://viewmorepics.myspace.com/inde...lbumId=1709080 http://s258.photobucket.com/albums/h...e_top_view_all |
10-21-2009, 08:37 PM | #6 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
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Re: Whats my gear ratio in this gm 12 bolt???
The problem your going to have is car and truck lug patterns dont match. so if you upgrade to front disc brakes and 5 lug the wheels would have to be different front to rear. car is 5 on 4 3/4 and truck is 5 on 5. car and truck parts arent interchangable. the ring gear size is different as well as the axles.
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
10-21-2009, 08:44 PM | #7 |
James
Join Date: May 2008
Location: Dayton, WA
Posts: 455
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Re: Whats my gear ratio in this gm 12 bolt???
I realize that the patterns are different. I have a set of front disk brakes for a camaro. And one day when I win the lotto or something, I can get me some drop spindles to hang them on. I'm just kind of gathering parts as I go. Who knows, I might get this thing done one day.
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Never crush'em. Restor'em or recycle'em. The payoff is always worth it in the end. http://viewmorepics.myspace.com/inde...lbumId=1709080 http://s258.photobucket.com/albums/h...e_top_view_all |
10-22-2009, 07:38 PM | #8 | |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Whats my gear ratio in this gm 12 bolt???
i'm gfoing to go out on a limb and guess....
It is more likely that you mis-counted the pinion than the ring, so.... 43 is correct along with a 14 tooth pinion, you get 3.07
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10-22-2009, 11:00 PM | #9 |
60-66 Nut
Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: Whats my gear ratio in this gm 12 bolt???
Does the cover look exactly like the one under your '66 or is it a little different? If it is in fact a passenger 12 bolt, they were available with 3.31 gears. Otherwise you may have mis-counted
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10-22-2009, 11:51 PM | #10 |
Registered User
Join Date: Mar 2005
Location: North Coast
Posts: 1,012
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Re: Whats my gear ratio in this gm 12 bolt???
I had a 3.31 in a 1968 Camaro.
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10-23-2009, 06:49 AM | #11 |
Registered User
Join Date: Feb 2006
Location: Smyrna, Ga
Posts: 1,647
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Re: Whats my gear ratio in this gm 12 bolt???
My 12 Bolt out of a '78 3/4 chevy truck had 3.42's.
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10-23-2009, 10:32 PM | #12 |
Senior Member
Join Date: Jul 2006
Location: Blountville, Tn.
Posts: 3,904
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Re: Whats my gear ratio in this gm 12 bolt???
Instead of counting teeth, does it not have the number stamped into the ring gear. That is where I look first, Spin the ring gear and look for the numbers, If it is 43 ring 13 pinion, it will have a number like 43:13 stamped on it. That will end all the cornfusion. find those numbers divide them, and that will be what your ratio is.
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