I have an 1994 astro van the tra...

This is a 4L60E trans, and should set trans failure/error codes in ECM memory. You don't mention odometer or whether it has been maintained or not.Noises or a MIL would be clues. From only your post, it sounds like either the filter has been getting clogged, or the pump has eaten itself up. Dropping the pan will tell the story.If you find a gritty residue in the bottom of the pan, or metallic slivers of magnetic steel (low planet failure), the valve body has been damaged (as well as the clutches and the band) and it will need a overhaul.