I have 2001 Dodge Caravan. I was driving it on the highway and the transmission went to nothing and I coasted to the side of the road. I had it towed home and once they got it off the truck it had all forward gears and no reverse. No problems with the transmission before this. The night before I did put some Sea Foam Transmission Fluid in it (2 oz.) I have since changed the fluid and filter on it. It has been parked since this has happened. Nothing but normal shavings in the pan and in the filter. (Tore filter in half to inspect.) Could it possibly be the TCM or did the Sea Foam additive do it in?