They most likely changed to Dextron because Type F is getting harder to find.
Start with the simple stuff first and eliminate the obvious.
You need to check your hydraulic filter to see if it is clogged. When changing from one fluid to another the new fluid could be cleaning the system and depositing the gunk into the filter. You also need to check the level. If you have a dip stick, it could be the wrong one and not giving you the correct reading.
Just exactly what kind of noise? Pounding or knocking is cavitation from air in the system. This can come from low fluid or a crimped or bent return line. Grinding noise can be a worn out pump or bearing.
Go to the Skid steer repair Thread (Top Thread ) and describe the exact noise and one of the experts will help you. If you stay on the “Mustang” thread, only us Mustang owners will see it.