Hi all. New to the forum. Lots of good info here. Okay, I have recently purchased a 2001 Excursion with the 7.3/ 4R100 combination. It runs and drives great except for one issue with the transmission. When shifting into third gear (pulling my boat) the tranny seems to make some type of stumble sorta like I'm hitting a large pothole or something. I am familiar with the hard shifts these make because I also own a pickup with the same set up. I have also noticed that when down shifting into passing gear it tends to stumble a bit and not immediately down shift. I did notice that without the boat behind it, the stumble into third seems more like a delayed shift or kinda like a slip. Any advise would be greatly appreciated. Thanks.