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02-16-2014, 09:42 PM
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#1 |
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Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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12 bolt rear ratio
Blew the rear end out of my 84 Silverado. My right rear wheel almost fell off going down the road and there is a 5 inch hole in my diff cover.
I have a replacement 12 bolt from a 79K10. I popped the diff and counted 47 ring and 16 pinion. Is it just me, or is that a lot of teeth? The math comes out to 2.94. My Silverado is 3.08. I'm hoping this read end is 308 also. Any tips?
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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02-16-2014, 10:27 PM
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#2 |
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Registered User
Join Date: Dec 2013
Location: Humble, Texas
Posts: 185
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Re: 12 bolt rear ratio
I'd say check your count again, they don't show that ratio in the catalog.
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I know the "VOICES" aren't real but they have some great ideas. 1978 GMC Sierra Classic C25 1983 Datsun 280ZX Turbo 1997 Chevy Cheyenne K2500 1999 Polaris Sport 400 |
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02-17-2014, 01:14 PM
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#3 |
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Registered User
Join Date: Nov 2008
Location: Gwinnett GA
Posts: 1,803
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Re: 12 bolt rear ratio
I counted it twice. I don't know the history of the donor vehicle though...
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1982 K10 SWB 1987 V20 - Sold - Doh! |
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02-17-2014, 02:19 PM
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#4 |
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BAD BOW-Silverado XST
Join Date: May 2000
Location: Senior Member from Austin, TX
Posts: 6,431
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Re: 12 bolt rear ratio
46/15=3.07 ~ 3.08
Count the gooves instead of teeth. The big ring will have number stampped on it. |
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02-17-2014, 02:23 PM
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#5 |
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Senior Member
Join Date: May 2004
Location: Caldwell,Tx.
Posts: 3,648
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Re: 12 bolt rear ratio
47 and 17 is a 2.76. That was a factory ratio offered. I haven't heard of the numbers you listed. If it is indeed as you counted it then you should be close enough.
Frank
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Born and proudly residing in a Red State ! |
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02-17-2014, 08:58 PM
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#6 |
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Registered User
Join Date: Jan 2009
Location: Canada
Posts: 308
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Re: 12 bolt rear ratio
The number of teeth should be stamped on the ring gear. The one shown is 14-43 which is 3.07.
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