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

09-18-2007, 06:20 AM	#3 (permalink)
Kennybill Senior Member Join Date: Aug 2005 Location: Youngstown, Ohio Posts: 198	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: 29	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.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Rear end help	Redog	Drivetrain/Differentials	6	09-13-2007 08:57 AM
1968 442 3.90 posi 12 bolt olds rear for sale	monzaz	Parts Wanted	0	09-11-2007 07:06 PM
rear end?	shvelhed88a	Drivetrain/Differentials	2	09-04-2007 08:47 AM
57 olds rear end: sta wag vs sedan ratio	benkerr	Drivetrain/Differentials	1	08-26-2006 07:41 PM
rear diffriintal convertion to posi	diablo76delta88	Small Blocks	0	05-24-2004 04:47 PM

02-08-2008, 03:54 PM	#4 (permalink)
rocket9r8 Junior Member Join Date: Sep 2006 Location: tacoma,washington Posts: 17	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