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02-21-2014, 06:08 PM
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#1 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Factory posi install
I'm not opposed to a full rebuild but my 70 has a factory open carrier with 3.73. I've got a posi unit with 3.73 ring gear out of a 67 with all the bearings and shims. What's the chance that it'll drop in with minimal shimming required?
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1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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02-21-2014, 06:21 PM
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#2 |
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Registered User
Join Date: Oct 2013
Location: Dresden, Ontario
Posts: 647
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Re: Factory posi install
If you can drop in both the ring and pinion from the posi unit, your chances would be better. No guarantee it will work but it should be close and easy to dial in by checking pattern on gear teeth.
As far as using your 70 pinion with the 67 ring gear this is not recommended as the ring and pinion wear in to each other over time.
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1970 Short Wide 5.3 4L60E BlackBear tune 3:73 gears, Boyd's Tank 2.5 / 4 drop 5 lug disc brakes Vintage Air 18x8 Ridlers 255/55 frt. 18x9.5 275/60 rear |
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02-21-2014, 06:56 PM
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#3 |
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Registered User
Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: Factory posi install
You beat me to it. Lol
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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02-21-2014, 07:19 PM
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#4 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: Factory posi install
What about bolting my 70 ring gear to the 67 posi carrier? This going to get me into a total re - setup more than likely?
__________________
1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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02-21-2014, 07:22 PM
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#5 |
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Registered User
Join Date: Oct 2013
Location: Dresden, Ontario
Posts: 647
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Re: Factory posi install
Yes bolting your 70 ring gear would be ok and might get you close. You will still have to check the tooth pattern. You might get lucky.
__________________
1970 Short Wide 5.3 4L60E BlackBear tune 3:73 gears, Boyd's Tank 2.5 / 4 drop 5 lug disc brakes Vintage Air 18x8 Ridlers 255/55 frt. 18x9.5 275/60 rear |
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02-21-2014, 07:26 PM
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#6 |
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Registered User
Join Date: Oct 2013
Location: Dresden, Ontario
Posts: 647
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Re: Factory posi install
Here is a link to help you pattern the gears. Also don't forget to check backlash. http://www.sierragear.com/ring-and-pinion-gear-pattern/
__________________
1970 Short Wide 5.3 4L60E BlackBear tune 3:73 gears, Boyd's Tank 2.5 / 4 drop 5 lug disc brakes Vintage Air 18x8 Ridlers 255/55 frt. 18x9.5 275/60 rear |
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02-21-2014, 07:27 PM
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#7 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: Factory posi install
Hopefully it'll be in the ballpark and just need some tweaking. I've set up a couple before but it's an all day affair for me from scratch and I was just hoping to avoid that. Thanks guys.
__________________
1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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02-21-2014, 09:11 PM
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#8 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Factory posi install
You'll be fine with your old ring and pinion. Just set your backlash and add a couple thousandths extra on each side for some preload.
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My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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02-21-2014, 09:46 PM
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#9 |
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Registered User
Join Date: May 2009
Location: Gonzales, LA
Posts: 779
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Re: Factory posi install
Thanks
__________________
1972 Pale Yella 2WD Blazer ..... 350HO/700R4.... '68 Clipped 1970 Original Paint SWB Farm Truck ..... 5.3/4L80.... 2x HRPT Participant |
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02-21-2014, 11:03 PM
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#10 |
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Senior Member
 
Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: Factory posi install
Years ago I bought a 8.5" rear axle for my 79 malibu. The axle came out of an early 80's 442. It was 3.73 open the p o had a posi but was scared to install it. It went in with minimal fuss. Btw the way i know the axle was in fact out of a 442 was only the 442 came with 3.73. Posi was optional. Buick GN had 3.42 posi. I understand the 8.5" rear behind the Buick 3.8 turbo, but why behind the 307 Olds but not behind the 305 in the Monte SS?
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