Thor, You're correct..I have the auto. Some guys think putting in the getrag 3.73 or 3.91 from the 6speed cars would be good...WRONG...the 6speed has a 3.00 first gear..the auto has a 3.58 first gear which would make the 3.91's act like a 5.13 axle. The 3.23 would probably be the best all around gear for the auto so I'm going to build that rear end next