WANT TO CHANGE MY 12 BOLT O TYPE OPEN 2.56 TO POSI 3.42

BIGJOESX · 03-06-2008, 06:05 PM

I have a 70 olds cutlass sx and I want to upgrade my rearend! Does anybody know where I could take or purchase parts for my 12 bolt o type open 2.56! I want a posi with 3.23 or 3.42s. I live in San Jose California! Does anybody know of any shops in northern california that can do some work or that sell the 0 type rear upgraded.

67442inmontana · 03-06-2008, 08:59 PM

I just purchased an 'O' 3:42 Posi from someone in Pennsylvania for my 67. It came as described and at agreed price. I think it was a good buy. I am asking him if I pass his name on. Are you interested in this.

Rallye469 · 03-07-2008, 05:38 AM

check out Reider Racing.
They sell the only upgrade to the 'O' type rear I know...
someone correct me if there's others.

It's a great piece that will handle close to 500hp,
but it is a little noisy.
-Pete

2blu442 · 03-07-2008, 06:08 AM

Supercars Unlimited in Portland Oregon has new posi carriers for the 12 bolt O axle. The link is: http://supercarsunlimited.com/Items.cfm?CategoryID=276
They also have new 3.42 and 3.90 gears for the O axle. I think you would need to know if your rear end has the 28 or 31 spline axles. I know both were used in the O rear ends, but don't know if Supercars has both or just the 31 spline carriers.

67442inmontana · 03-07-2008, 07:22 AM

Brian Trick [thetrickfamily@yahoo.com], built one for my 67 442. He is out of Pennsylvanina.

BIGJOESX · 03-07-2008, 02:28 PM

Thanks for the response guys and yes I'm interested 67442inmontana if you could pass on his information! Thanks

shaks 442 clone · 03-17-2008, 10:35 PM

try and research califnornia differentials they were in fremont california but i cant find them anymore and they use to sell the stuff to rebuild a type O rearend

kaz442 · 03-18-2008, 02:17 PM

Quote:

Originally Posted by 67442inmontana

Brian Trick [thetrickfamily@yahoo.com], built one for my 67 442. He is out of Pennsylvanina.

Brain did my 12 bolt in my F85, he's a good guy and very easy to deal with. He ships and is very reasonable on $$. JKaz

jlrichcreek · 04-25-2008, 05:39 PM

Here's a good source and you can tailor a rebuild package for your diff. Total pack ~$700 http://rearendparts.com/.

For your specific 12 bolt click here http://rearendparts.com/product.php?...&cat=23&page=1

Jeff

03-06-2008, 06:05 PM	#1 (permalink)
BIGJOESX 70 OLDS SX Join Date: Mar 2008 Location: NORTHERN CALI Posts: 3	WANT TO CHANGE MY 12 BOLT O TYPE OPEN 2.56 TO POSI 3.42 I have a 70 olds cutlass sx and I want to upgrade my rearend! Does anybody know where I could take or purchase parts for my 12 bolt o type open 2.56! I want a posi with 3.23 or 3.42s. I live in San Jose California! Does anybody know of any shops in northern california that can do some work or that sell the 0 type rear upgraded.

03-06-2008, 08:59 PM	#2 (permalink)
67442inmontana Junior Member Join Date: Mar 2008 Posts: 5	Rear End change I just purchased an 'O' 3:42 Posi from someone in Pennsylvania for my 67. It came as described and at agreed price. I think it was a good buy. I am asking him if I pass his name on. Are you interested in this.

03-07-2008, 06:08 AM	#4 (permalink)
2blu442 Senior Member Join Date: Sep 2006 Location: Medford, Oregon Posts: 775	Posi Rear End Supercars Unlimited in Portland Oregon has new posi carriers for the 12 bolt O axle. The link is: http://supercarsunlimited.com/Items.cfm?CategoryID=276 They also have new 3.42 and 3.90 gears for the O axle. I think you would need to know if your rear end has the 28 or 31 spline axles. I know both were used in the O rear ends, but don't know if Supercars has both or just the 31 spline carriers. __________________ 1964 Cutlass Factory 4spd 1965 442 4spd 1967 442 Auto 1967 Cutlass Convertible 1968 442 Auto 1969 442 W30 Auto 1970 442 4spd 1971 Cutlass Flat Top Wagon 1973 Che*vy 3/4 Ton 454/TH400 Tow Vehicle Only the tow vehicle is finished!

03-17-2008, 10:35 PM	#7 (permalink)
shaks 442 clone Senior Member Join Date: Apr 2007 Location: hayward, california Posts: 227	try and research califnornia differentials they were in fremont california but i cant find them anymore and they use to sell the stuff to rebuild a type O rearend __________________ my cutlass as of 08/27/2007 Last edited by shaks 442 clone : 03-17-2008 at 10:42 PM.

04-25-2008, 05:39 PM	#9 (permalink)
jlrichcreek Junior Member Join Date: Apr 2008 Location: Columbia City, IN Posts: 2	Differential rebuild resource Here's a good source and you can tailor a rebuild package for your diff. Total pack ~$700 http://rearendparts.com/. For your specific 12 bolt click here http://rearendparts.com/product.php?...&cat=23&page=1 Jeff

03-07-2008, 05:38 AM	#3 (permalink)
Rallye469 Senior Member Join Date: Feb 2008 Posts: 179	check out Reider Racing. They sell the only upgrade to the 'O' type rear I know... someone correct me if there's others. It's a great piece that will handle close to 500hp, but it is a little noisy. -Pete

03-07-2008, 07:22 AM	#5 (permalink)
67442inmontana Junior Member Join Date: Mar 2008 Posts: 5	Brian Trick [thetrickfamily@yahoo.com], built one for my 67 442. He is out of Pennsylvanina.

03-07-2008, 02:28 PM	#6 (permalink)
BIGJOESX 70 OLDS SX Join Date: Mar 2008 Location: NORTHERN CALI Posts: 3	Thanks for the response guys and yes I'm interested 67442inmontana if you could pass on his information! Thanks

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