My 95 Caravan has recently been having problems. Once the van is ran for a while and warmed up, the tranny will jump out of high gear into low gear for some reason. In other words, if driving down the road at 45 mph, the van will jerk into 1st gear and wont shift into any other gear but 1st, rev., neut., etc.. Somebody suggested changing the vacuum hoses and gaskets but I'm scared its the tranny or something more serious. I'm broke and I pray I can afford to fix the van. Please help me!