Worried about my car...

[Goat Blower]

Change the fluid and filter, use stock tranny fluid. Three out of four times I've done this on older autos, it's fixed the problem. If you can do it yourself, you're only out $100 if the tranny is for sure bad.

I wouldn't always trust what a tranny shop says, just think about what keeps their shop open and the guys paid. Bring in a car to the same shop with a known good tranny and see if they give you the same diagnosis.