While the truck is at the media blaster, I have some time to go over my problem list. Top of the list is a problem I noticed with my truck from day 1. It is what I will call "chatter". When pulling out or backing up, more noticeable up hill as more load is induced, the truck will chatter meaning the gear shift lever will rock side to side and the truck movement forward or reverse is erratic and jerky. I assume the engine is also rocking. Don't know how else to describe this. Don't always have it if on a level surface and load is light. Engine mounts bad? Clutch grabbing? Something else?