Since I have had my truck, a total of almost 2 months, everyone in a while I notice a quite audible rattle coming from the rear passenger side of the truck. This only happens when i am either gearing down, or going up from 1 to 2nd or 2nd to 3rd. It may happen in the higher gears although I cannot hear it as the engine is probably loud enough to muffle the sound. Has anyone else heard about this? I am taking the truck to toyota for the first oil change, so I can get a chance to talk with the mechanics about what problems they have seen and what toyota will fix. The service department always seems more helpful than a salesman. This problem doesnt happen all the time, maybe twice a week but when it happens it happens over and over throughout that day. Id like to have some ammo when i attack the dealer tomorrow so any info would be greatly appreciated.