so i have a 69 cutty it has i think .... ? a 8.5 "O" 12 bolt cover but 10 bolt gear plate ?

ITS coded R2 wich is 2.56 ratio wich really sucks cause im going for a street strip ( probly go to the strip just a couple off times ) but its just more for crusin around burnin the tires and tryin to get the front to lift up when i take off

What is the best / not to expensive ways what will it cost to go to 3.42 or even a little taller/ shorter ( herd it explained both ways ) 4.11 seems to be fore drag racing only and would not be good for cruising it will have a mildly buit 350 in it and posi would be nice but that all depends on cost also

has any one swaped out there 2.56 rear for somthing else please share thanks

69 olds cutlass "S"
69 olds cutlass supreme

 

i was just reading up on this via nova and chevell threads and i went to go check my other cutlass the supreme is canadian built and from what i am reading it may verry well have a chevy 12 bolt in it from factory ?????my cutlass s is amarican built and is in way beter shape and plan to spend more monney time into this one


the rear end looks physically diffrent it is a 12 bolt and i can not find any code letters like on my 2.56 12 bolt O diff

were all canadian built cutlass's equiped with a chevy rear end ??

 

Welcome to the site Jmac! Have you read through the wiki section to see what it says about rear ends? If not, here's the link to those pages.

http://www.oldsmobilewiki.com/index....bile_Rear_Ends

Check it out and if it doesn't answer all the questions update your post. John

 

yah thanks lots of information there pretty sure i have a chevy 12 bolt so int shouldnt be hard to swap out any gears and put in a c-clip eleminator in my fun car

 

If you have a picture of the rear cover that wil ltell us for sure. Jim