to all who responded to my questions Thank! I was thinking to hard about my problem. If any of you read my first post about a taco with noise and vibration I found out what it was. I was thinking the worst but after a little jack danneils, and a couple of brews I climbed under the truck and discovered that the center support bearing on the drive shaft was toast! Duhhhh....well I'm gonna replace it and then well see but I belive that the problem. It fits all the symtoms. Well time for a few drinks and off to the garage.