I'm posting this as informational only should it be of help to anyone else. My T&C van was dragging bottom for quite some time. 200 lbs of weight in the back and we were riding on the axle (rubber stoppers touching). I searched high and low for replacement springs, however, I found that these were dealer-only items. So, I went to the dealer and dropped $194 x 2 for new springs (one was a special order). Also bought new bushings. On a Saturday, I removed the old spring and replaced it only to find that the ride height did not change at all!!! So, I quickly removed the part and went back to the dealer (Maxwell Dodge in Austin, TX) to beg for my money back. 10% restocking fee and a little begging and they refunded my money. Thanks Maxwell!
During my search for new springs, I did find a few places that carried "helper" springs, which are a second spring that sits under the mono-spring. I can personally recommend Crotty's
Supposedly, the van came with 1100 lb. springs and the helper springs were
750 lb springs. Discounting the lift of the mono spring to 700 lbs (since they aren't working now), I figure that I now have about 1450 lbs of capacity. Who knows for real. Installed the helper springs - it was really easy. The van is now about .75" higher than it should be, but it's hardly noticable. The great thing is that the van still has a good ride. I was worried that the additional lift would convert the van into a truck! :-( Luckily, it didn't. :-)It appears that Chrysler went through many springs on these vans. They had to use my VIN number to match the exact spring. Maybe the later year editions have better springs.
--brian