[jbclassix]

The 11.5 AAM has the different limited slip. As for the perches, ditch the stock crap. I know it's a more abusive environment, but the government trucks in our fleet needed the perches built up from wear. They are rounded on the edoes and allow for more movement. I wasn't happy with the aftermarket ones my brother bought either. I would have rather made my own. I'll be running a ladder bar setup on his for added strength