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03-04-2013, 03:20 PM
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#1 |
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Registered User
Join Date: Aug 2003
Location: oregon
Posts: 54
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12 bolt question
Can someone explain what I'm looking at here? I don't see this mechanism in any exploded views.
The ring gear has 34 teeth and turning the wheel 2 turns gets about a 3:40:1 ratio, it's in a '70s c10 2 wheel drive. |
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03-04-2013, 03:33 PM
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#2 |
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Registered User
Join Date: Sep 2008
Location: Bailey, NC
Posts: 2,462
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Re: 12 bolt question
It's an Eaton factory posi locker carrier.
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Jeramy '84 GMC project truck '85 Chevy 4X4 SOLD '07 Chevy Trailblazer SS 5th Annual SHPHC Car/Truck Show Pics http://67-72chevytrucks.com/vboard/s...d.php?t=543605 UPDATED PICS! CHECK 'EM OUT |
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03-04-2013, 03:56 PM
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#3 |
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Registered User
Join Date: Aug 2003
Location: oregon
Posts: 54
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Re: 12 bolt question
Where are the clutches?
I found these #s on the ring gear 6270998 10:34 GM 9 782 Can't find the 3:40 ratio listed anywhere, this is all new to me so please excuse my ignorance. |
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03-04-2013, 05:02 PM
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#4 |
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Registered User
Join Date: Aug 2003
Location: oregon
Posts: 54
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Re: 12 bolt question
I should have posted in "engine and drive train" If a mod can move would be grateful
ThanksMark |
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03-04-2013, 05:33 PM
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#5 |
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Registered User
Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
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Re: 12 bolt question
It isn't a clutch-type traction device. HERE:
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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03-04-2013, 07:42 PM
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#6 |
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Registered User
Join Date: Aug 2003
Location: oregon
Posts: 54
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Re: 12 bolt question
Thanks Devin
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03-04-2013, 09:11 PM
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#7 |
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Registered User
Join Date: Sep 2009
Location: Beaverton, OR from WA State
Posts: 1,515
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Re: 12 bolt question
No problem, I hope that helped answer your question. It is referred to as a "G80", the RPO code used to order/purchase it.
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Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96 |
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03-04-2013, 09:22 PM
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#8 | |
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just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: 12 bolt question
That's the "replacement" for the original clutch-type "posi-traction" that GM used in the earlier years. It is known as "Gov-loc". Option code G80.
Despite the word loc in the name, it is not a locking differential. It is a clutch-type posi-traction unit that is "self-adjusting". It acts like an open differential until one wheel spins faster than the other. Then the mechanism engages the clutches, giving traction to both wheels. They are not very strong. In a completely stock truck, driven normally, it may be ok. If you intend any heavier use, it is advisable to remove it.
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03-04-2013, 09:41 PM
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#9 |
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Registered User
Join Date: Aug 2003
Location: oregon
Posts: 54
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Re: 12 bolt question
Thanks for your help Longhair Jeramy and Devin
You've given me the info and links I need to make a decision as to put this in my '77 swb stock 350/350 Mark |
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03-04-2013, 09:47 PM
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#10 | |
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Registered User
Join Date: Oct 2003
Location: houston, texas
Posts: 1,974
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Re: 12 bolt question
Quote:
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2008 Silverado Z71 RCSB 1991 GMC Jimmy 4x4 1976 GMC Sierra C15 SWB |
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