Originally Posted by 303oldskool
Another question would be do you know a site where I could find out exactly from the code what rear end it is and the specs on it ( gear ratio) its a 12 bolt as well and also is the correct number just one letter and than 2 numbers?
the numbers I found are...(D26)(GM72)and(3896339 with the letter N underneath the numbers) Thanks again by all means!!
Double check that casting number to make sure it's correct, I think the D26 is for a 1966 housing as SSedan stated. I cant find any 66 12 bolt car's with that casting number.