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I was not trying to suggest that your transmission does need to be overhauled, just giving my two cents the task itself.
Is the transmission still in the vehicle? If so, cover the basics first.
1. Drive around and get it up to operating temperature. On a level surface, check the fluid level with the engine running and the selector in Park. Make sure that the transmission is full, and not overfilled. If you must add fluid, be sure to use Dexron III as per the FSM. Other fluids have different friction qualities that can have adverse effects on operation.
2. Examine the fluid. Is it a nice, transluscent red, or is it maroon, brown or black? Does it smell burnt? Feel it; is it gritty between your fingers (this would be friction/clutch material). If the fluid is anything other than clean, and red, a flush / filter change may be in order. It is important to do this completely, and correctly to insure you get all of the old fluid out of the transmission, as well as the torque converter, transmission cooler, and lines. By simply dropping the pan, you would only exchange about half the fluid.
If the transmission is still in the vehicle, and you want to take it to the tranny guy, leave it in the vehicle. Even if the unit does require overhaul, having the ability to diagnose the problem in the vehicle is huge. He can actually know what he is looking for before he takes it apart. In the end, it may be something as simple as a leaking vacuum line.