So today I slowed down to pull off the road and in to my drive way. I slowed down, almost to a stop but not completely. I think that I was in second gear, but the reaction of the truck was sluggish (almost as if I was starting from a stop in 4th or 5th gear like the trans did not down shift at all). The RPMs also climbed up but no movement. Then when I finally got moving, there was a loud clank that sounded like it came from the driveshaft. I have no idea what happened. The truck has felt like it was sluggish almost like it did not down shift before as I have been in the same spot pulling in the drive way, yet I have never heard a pop before. Anyone know of anything as to this?