2002 Taurus Wagon, Vulcan Engine, AX4N tranny, bought 2 years ago with 48,000 miles--now has 58,000 miles. We live in the flatlands of Indiana, and have done a lot of interstate driving with no problems with the cruise control. Made a trip out to Virginia to see my 87-year old father last week. Went to Washington, Pa., then took I79 down to Morgantown, then I68 across W. VA., Maryland, to Hancock, then 522 down through Virginia. In the mountains on I68, I set the cruise for 65mph. Climbing the hills, the tach would rev from 2300rpm to 3600rpm, then drop back down trying to keep the speed at 65mph. Coming down the hills, you could feel the car surge back and forth as the cruise fought to keep the speed at 65mph. Just wondering out loud if people drive like this with the cruise on all the time, no wonder these trannys fail so much. After a couple minutes of this, I took the cruise off and did OK by delicately holding the accelerator at 2800rpm going up hill, and braking every so often going downhill. Made the same trip about 4-5 years ago in my 97 Windstar and don't recall having this problem. Also, around Columbus OH., car jerked about 3-4 times when going 50-60 mph. Felt like fuel delivery, but could have been tranny related (happened 3 times to the wife--think she was messing with the cruise (resume, coast, etc.), and that may have been part of the problem. Had fuel filter replaced last September. Stopped after Columbus and filled up with mid-grade which I ran the rest of the trip and didn't have any more problems. The plus--got over 28+ mpg one time (& this was going through the mountains), and 26 mpg a couple of other times. Contribute it to the mid-grade gas, because we usually only get 25 mpg on interstate driving.