First, check the transmission oil level while the engine and transmission are hot, idling and in park.
While you are checking the oil, is it bright cherry red (not dark red or brown) and does it smell burnt. If dark or burnt, you are probably looking at a rebuild sooner rather than later.
If Everything is looks good, I would drain it (don't forget the torque converter) and change the filter.
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Peace, it's our only chance
1998 E150 Club Wagon, 4.6L Modular, E4OD
2007 Milan. 3.0L Duratec, Aisin 6 speed AW-F21
others I look out for
2007 Escape 2wd (the mini Pumpkin), 3.0L Duratec, CD4E
2008 Mazda3 5 door, 2.3L, 5 speed manual
My advice is worth every cent you pay for it ! | 
