I bought a 97 ranger xlt in the summer. when i test drove it the tranny and clutch seemed fine. one day after driving about 45 min to an hour the clutch started to slip pretty bad. it only does this after the truck has been running for a while other than that it works great. now that its cold outside haven't had the problem. could the tranny or clutch plate be overheating if so why. if anyone has any insite on this advice would be greatly appreciated