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.

 

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.

 

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

 

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.

 

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

 

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

 

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

 

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

 

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

 

That package is for a Chevy 12 Bolt