Normal
It's not that the fluid expands, it's where it is. I am not an automotive engineer and I might be wrong, but I think that when the engine isn't running the torque converter slowly drains fluid into the pan. At any rate, there is a reason why you check transmission level with the engine is hot and running and not when it's cold and not running. Cheap Experiment: Use your B&M dipstick and check the transmission fluid level in the morning after the truck has sat overnight, and compare it with the reading you get when it's hot and running.
It's not that the fluid expands, it's where it is. I am not an automotive engineer and I might be wrong, but I think that when the engine isn't running the torque converter slowly drains fluid into the pan. At any rate, there is a reason why you check transmission level with the engine is hot and running and not when it's cold and not running.
Cheap Experiment: Use your B&M dipstick and check the transmission fluid level in the morning after the truck has sat overnight, and compare it with the reading you get when it's hot and running.
