Looking into buying a 4dr 2007 JK and needing questions answered about stock gears.. I've seen where the X and Sahara came with either 3.21 or 4.10. My question is how to tell what gears a 2007 has without having to call the VIN in to dealership. Did all the auto transmissions come with 4.10 and not 3.21? Any help would be appreciated guys! Thanks!