Thanks for the info but in this case I am pretty sure it is the drive. When the engine heats up I can idle down, go outside the tractor, hear the fan start to take hold and speed up the fan, then the engine will cool right down, even if I go right back to work. As long as I hear the fan kick in while under a heavy load, things stay cool. If I can't hear the fan kick in, it gets hot. Sometimes it works perfectly for maybe an hour before the fan fails to kick in.

I also had a 4450 that had the temp sender go out like you describe.

Yes, Ag Talk is a great place. Thanks to David for starting it, the volunteers that help him maintain it, and those who donate dollars as needed to keep it in top form. It truly is a real asset. Not to mention fun!

John