Pulled into the local 4x4 night last night. Backed into a parking spot and revved the engine a bit(messing with a friend).... As soon as I did that, I hear a horrible noise. Sounded like the fan let go or a similar scraping sound. I turned it off and looked aroudn and found nothing wrong. My temps were a little high due to a muddy radiator so I thought i owuld let it cool and see if it changed. Well, it slipped my mind once Jerry(JK5) got there with his K5 and I never messed with it until I left. Jumped in my truck to go meet Jerry to take him to his tow rig. Hit the key and that horrible noise was still there. DOH!!! \ So a friend and I are thinking the bendix in the starter isn't disengaging. We beat on the starter some and it wont go away. So my friend grabs a few wrenches and dives under the truck and starts messing around. We decide to pull the starter. Once it was off the block we couldn't see anything wrong with it. My friend sticks his hand up in the starter hole of the tranny inspection cover. He feels something wedged in there. After some messing around, he gets it out... It was the allen head part of a 3/8" allen key socket. I about **** my pant and have no clue how it got there!!! Just had that cover off in October when I put new headers on and I never used a socket like that down there. Only thing I can think of is the previous owner and builer( a friend of mine) lost it while building the truck. Funny how it took close to 3 years to surface!!!!! Very Weird!