Automatic with a V6 (2012/2013 not sure about previous years) requires a complete diff swap to use anything except 3.55. That is the only gear I am aware of that will fit this POS diff they gave us V6 automatics and it can not be turned into a posi yet either. You will need a center section from a manual V6 or any SS, both axles, both wheel hubs and the rear section of a driveshaft to make your front driveshaft section to a rear section to bolt up to the new diff center section. Than you can have a world of gear to pick from. I tell you this from experience, I did the complete swap a few weeks ago. I only went with 3:42 gearing ( that came in the rear ) I needed the posi-traction to help me hook up when I use nitrous. Trifecta sent me an update for the speedo fix. I would order some diff bushings while you do the swap and maybe some other rear suspension upgrades, bushings, arms, and other goodies while it is out for the swap and save some labor while it is apart. I know there are vendors on here that keep all that stuff in stock and ready to sell.
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Originally Posted by IneedAZ
Mine is an automatic. What is done about the speedometer? How is it calibrated?
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