1970 olds 98 455 rear end posi

troy1 · 09-15-2007, 09:00 AM

I would like to change the rear end from 2.73 gears to 3.42 and add a positrac.

any spec information to start hunting for parts would be appreciated.

troy

88 coupe · 09-15-2007, 11:11 PM

Check with Brian: thetrickfamily@yahoo.com

He is a well known Olds guy, whose specialty is Olds rear ends.

Norm

Kennybill · 09-18-2007, 06:20 AM

You will have to go to an after-market housing such as a corporate 12-bolt GM or a Ford 9". After-market gears are non-existant for 1965-1970 Olds. The best u will find, if u r lucky, is a 3:08 posi. I am into the "big" Olds and I have looked for years for better gears, the best I have found is 3:08. I have several 3:08 Posi, most in my cars. Good luck, Ken

rocket9r8 · 02-08-2008, 03:54 PM

hey there, yep kennybill is on target, nobody home in the after market, i did all what kenny said to my 98 convertible except the rear end boy does it scoot! thanks kennybill

Edveen · 02-12-2008, 01:49 PM

Richmond Gears makes aftermarket Rings and Pins for the O-type posi unit.
http://www.richmondgear.com/01gm.html

They only fit for the #671 (3.08's 3.23's) posi carrier though.

This information is from Brian Trick (as mentioned above). I've mentioned this before. If your going the posi route, I highly recommend for anyone to talk with him. He is awesome.
By the way, Brian can make those richmond gears fit #672, #588, and #673 posi carriers.

09-15-2007, 09:00 AM	#1 (permalink)
troy1 Junior Member Join Date: Sep 2007 Posts: 2	1970 olds 98 455 rear end posi I would like to change the rear end from 2.73 gears to 3.42 and add a positrac. any spec information to start hunting for parts would be appreciated. troy

09-15-2007, 11:11 PM	#2 (permalink)
88 coupe Junior Member Join Date: Oct 2004 Location: Southern CA Posts: 738	Check with Brian: thetrickfamily@yahoo.com He is a well known Olds guy, whose specialty is Olds rear ends. Norm __________________ I love the reaction when they find out it's not a Big Block Chev . . . . . . . It gets even better when they find it's all Olds.

09-18-2007, 06:20 AM	#3 (permalink)
Kennybill Senior Member Join Date: Aug 2005 Location: Youngstown, Ohio Posts: 196	You will have to go to an after-market housing such as a corporate 12-bolt GM or a Ford 9". After-market gears are non-existant for 1965-1970 Olds. The best u will find, if u r lucky, is a 3:08 posi. I am into the "big" Olds and I have looked for years for better gears, the best I have found is 3:08. I have several 3:08 Posi, most in my cars. Good luck, Ken __________________ A man has to know his limitations, especially with an Oldsmobile

02-12-2008, 01:49 PM	#5 (permalink)
Edveen Member Join Date: May 2006 Location: MD/DC Posts: 28	Richmond Gears makes aftermarket Rings and Pins for the O-type posi unit. http://www.richmondgear.com/01gm.html They only fit for the #671 (3.08's 3.23's) posi carrier though. This information is from Brian Trick (as mentioned above). I've mentioned this before. If your going the posi route, I highly recommend for anyone to talk with him. He is awesome. By the way, Brian can make those richmond gears fit #672, #588, and #673 posi carriers. Last edited by Edveen : 02-12-2008 at 02:02 PM.

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02-08-2008, 03:54 PM	#4 (permalink)
rocket9r8 Junior Member Join Date: Sep 2006 Location: tacoma,washington Posts: 15	hey there, yep kennybill is on target, nobody home in the after market, i did all what kenny said to my 98 convertible except the rear end boy does it scoot! thanks kennybill

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