I have a '06 TRD off road w/ the 6sp and just over 11K. It seems when I start out slow or on a hill, the tranny likes to 'growl'. This sounds only last for a second after the clutch is fully engaged and the truck is moving, then goes away. The sounds also seems to be noticable when i shift into second and not acclerating very hard. Again it is only a sound, and everything mechanically seems to fine. The sound does not sound normal and was curious if anyone else has this same type of noise occur. I have not had anyone look at it yet. I thought and check to see if this was a 'normal' thing for the 6sp. If anyone has can shed any light on this issue it would greatly appreciated.