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12-17-2016, 06:22 PM
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#1 |
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New Member
 
Join Date: Sep 2016
Location: Harrisburg, Pa
Posts: 16
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12 Bolt 3 Series
In need of Differential Guru ? Have 81 C10 with 6 Cylinder , Turbo 350 and 12 Bolt Truck Differential Changed out to 350/350 but doesn,t matter i guess. Anyway in my research online that has me confused . Evidently I have a 3 Series 12 Bolt Rear. Does this mean I can only run up to a 3.42 Posi Trac rear ? Or can I run a 4:new: Series as Long as I use the 4 Series Carrier ? :ito::ito:
Last edited by cavedog309; 12-18-2016 at 06:00 AM. Reason: Add Picture |
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12-17-2016, 09:57 PM
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#2 |
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Registered User
Join Date: Jan 2007
Location: Garland,TX
Posts: 431
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Re: 12 Bolt 3 Series
you can run 3.73's on a three series carrier. I wouldn't be surprised if someone made 4.10's for a 3 series carrier...but yea, usually 4.10 and lower will require a 4 series carrier
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80 C10 SWB Step Side - 350 w/ vortec heads, TH350, 12-bolt 3.73 |
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12-18-2016, 06:04 AM
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#3 |
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New Member
Join Date: Sep 2016
Location: Harrisburg, Pa
Posts: 16
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Re: 12 Bolt 3 Series
69 Heavy Chevy , How can one differentiate a 2 series from a 3 and 4 series ? This unit I have may even be a 2 series now that I have read more into these rear drives. Very Confu
 sing, I always thought a 12 Bolt was a 12 Bolt ???
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12-18-2016, 08:38 AM
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#4 |
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Registered User
Join Date: Apr 2009
Location: New Freedom Pa.
Posts: 1,335
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Re: 12 Bolt 3 Series
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Desert |
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12-18-2016, 02:15 PM
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#5 |
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Registered User
Join Date: Sep 2007
Location: Wichita Falls, Texas
Posts: 459
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Re: 12 Bolt 3 Series
The flange where the gear bolts on is thinner on the 2 series than the 3 or 4. Pinions get smaller the higher number gear you go to. Theres an ID chart online somewhere.
Here you go...... http://67-72chevytrucks.com/vboard/s...d.php?t=347930 Last edited by bdiamond; 12-18-2016 at 02:20 PM. |
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12-18-2016, 04:14 PM
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#6 |
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New Member
Join Date: Sep 2016
Location: Harrisburg, Pa
Posts: 16
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Re: 12 Bolt 3 Series
Thank You for the explanation, Much Appreciated !
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12-21-2016, 09:32 AM
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#7 |
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Registered User
Join Date: Feb 2000
Location: Saint John NB Canada
Posts: 169
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Re: 12 Bolt 3 Series
Truck 3 series will not work with OEM 3.73 gears. 3.73 is the 4 series carrier.
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Member # 286 1975 Trans Am 1986 GMC Wrangler 4X4 1985 Silverado K30 Dually 2016 Skidoo Renegade XRS 800 2016 Yamaha Grizzly 700 |
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