Going to be taking the truck to a shop sometime this week. (Wagley Creek Automotive. In Sultan, Wa. I'll give a review afterward.) One of the things I am going to have them take a look at is the transmission problems. The "off" light on the shifter stalk is blinking. Shifts were VERY harsh, before I got the truck to a level spot, and finished filling up the trans fluid. Not quite so harsh after that. Almost normal, but a little harsh. The previous owner said that when they stopped driving it, it would not shift into overdrive. That it would kind of shake or rumble, and never actually go into OD. The light wasn't blinking at that time. And if they just pushed the button and turned OD off, So then the light would light and stay lit. it would drive normally. Just with no OD. Now, I can't even get that. It blinks and continues to blink, so i CAN'T just turn it off, no matter how, when, or how many times I push it. He was afraid it was the torque convertor. I am not so convinced. I have been reading a lot about this problem. I am at least mostly confident that it is probably an electrical problem, or a sensor problem. At most, maybe a valve inside the trans pan. What I need is a comprehensive overview of how the overdrive system, and the E4od itself, works. What are ALL the sensors that might have a problem? (Even if not directly related to this.) And maybe later, how would I test them? (Pretty sure Wagleys will know how to scan for codes, and will do that, first thing.) What is the valve inside that might have a problem? Etc. How would those problems affect it? How would they affect each other? Can anyone take the time to write out such an overview for me? And maybe a logical list of what to check, in what order, etc? Something I can pass on to Wagleys?