There are a few tests that can be done to isolate your problem before ripping out the tranny. I say this all the time but, you have to find a shop that actually repairs and rebuilds transmission on site. Most places just rip out your old one and replace it, usually charging around $2400. Not a bad haul considering a rebuilt CD4E can be had for around $900.
Anyway, find a shop and have them check the line pressure with the solenoid connecter on and with it off. If they get over 250 PSI with the connector off then your pump is OK. They should also check the pressure in all the gears as well.
Your description sounds like a bad pump and damaged clutches and you will likely need a rebuild. A fair price is about $1600.
Good luck
jeff
