Hello all. I have a 1999 v10 f250 lariat super duty with 179,000 miles. Ive had it for about 6 mos. now. I got a great deal on it since the guy i got it off thought it needed a tranny but since ive had it its only acted up twice. The most severe issue it has done is the speedo will start to jump around erratically and not read right and when this happens the shifting slams from gear to gear. ( which would make it seem like it needs a tranny.) I drove it for 2 mons before it did this for the first time and after I parked it for the night I hopped back in the next day and it was right back to normal again shifting flawlessly. I have been driving it now since then with no trouble, until yesterday. Right out of the box the speedometer was all whacky and it was slamming from gear to gear. Now there is a new perk. I pulled over and shut the truck off and I could hear a clicking buzzing noise coming from the dash like to the left of the stereo. The next thing is with the truck in park and running i put the seat up which is power and the starter kicked in twice. We went to eat and after coming out the truck was perfect again and now here I am. I think its posessed! What do you think?