I have an old LS355SS and today when I hooked up the Brush Hog, I was mowing for 5 or so minutes and it just stopped going forward, like it shifted into neutral. I lifted the Brush Hog and it moved again. Then it wouldn't go forward, but did in reverse with the brush hog raised, I was able to get to the barn. I engaged the pto and heard a load clang. its full of fluid as i added ma few gallons. Trying to figure out what it could be/where to look.