Need Help with the Mini Van Tranny

I've been a Chryco parts guy for 23 years. That said, I'm inclined to say that the condition described is not likely the solenoid pack. More likely, it needs an overhaul, which, is not expensive if you can do it yourself, but competitive with the value of the van if you can't. If you are reasonably mechanicly inclined, get yerself a factory service manual, and have at 'er. You can't make it worse.