Hi Moses,
I have the same exact problem, same year and everything. except mines got 197,000 miles. 5.8 engine.
Shifts perfect through all gears, it just started doing exactly what was described above.
I pulled the pan and the magnet has some dark shavings attacthed to it. Also found a few slivers of aluminum .
Does the E4OD have a torque converter drain plug? Transmission oil does not smell burn, but it had like a dark oil greasy substance in the bottom of the pan.
Should I just replace the fluid and filter or get another tranny?
I use this mainly for camping on like 100-250 miles trips.
Never gave me any problems before and it cruises at 80 mph.