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09-17-2016, 06:19 PM
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#1 |
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Registered User
Join Date: Mar 2002
Location: woodstock, alabama, usa
Posts: 938
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rear axle question
I have a 71 with 3.08 positraction 12 bolt truck rear (3.07?) and its gonna need more
Gear. Can i go to a 4.11 or higher gear set in this housing? Or do i have to keep It 3.73 or below? Anybody know for certain? Thanks,Tony
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i survived cancer and kidney stones, but my kids are killing me. |
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09-17-2016, 07:48 PM
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#2 |
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All about them K’s
 
Join Date: Jun 2014
Location: Farmington, New Mexico
Posts: 6,232
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Re: rear axle question
The housing is fine but you'll likely have to swap the carrier.
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Tyler '57 3100 http://67-72chevytrucks.com/vboard/s...d.php?t=813888 '72 K20 Cheyenne http://67-72chevytrucks.com/vboard/s...d.php?t=662879 ‘69 K10 SWB http://67-72chevytrucks.com/vboard/s...d.php?t=805206 '98 Silverado LT K2500HD ECLB Vortec 454/4l80E: 6" lift 315/75/16's ‘87 IROC-Z all original 50K mile survivor TPI 305 IROC Blue ‘10 Camaro 2SS/RS Aqua Blue Metallic #93 -version 2.0 
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09-17-2016, 10:45 PM
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#3 |
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Registered User
Join Date: Dec 1999
Location: Austin, TX, USA
Posts: 7,709
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Re: rear axle question
I ran thick 4.10 gears in my Jimmy when it still had the 12 bolt. You can buy gears that will work with your 3 series carrier.
But if you have a 4 series you can't go numerically lower as the gears would be too thin.
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44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax |
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09-18-2016, 06:23 AM
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#4 |
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Registered User
Join Date: Mar 2002
Location: woodstock, alabama, usa
Posts: 938
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Re: rear axle question
thanks guys, thats what i needed to know, Tony
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i survived cancer and kidney stones, but my kids are killing me. |
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09-18-2016, 03:57 PM
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#5 |
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Registered User
Join Date: Dec 2015
Location: Newark ,Delaware
Posts: 158
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Re: rear axle question
 Not tryin to thread jack , but does anyone know torque spec on spider gear pin lock bolt on same setup? 71 c10 12 bolt. Did axle bearings & seals. I searched hi & lo cant find any spec on bolt.
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