mine has been doing the rev/slam every so often for the last two years. it finally broke last night, i was driving about 70mph and it locked up like you put it in park, and then broke free, i was able to limp it home, it only has third gear kinda of. also you put it in neutral and it goes in reverse, this morning i was trying to move it out of the drive and it would go forward about ten feet and then lock up. it is at ford now, waiting to see what they say.