I HAVE A 2001 F150 4X4 WITH A 4R70W TRANSMISSION . I HAD THE TRANSMISSION REPLACED AT 4000 MILES,BECAUSE THE CLUTH WAS SLIPING ON AUTOMATIC DOWN SHIFT FROM 3RD TO 2ND. I AM NOW AT 22000 MILES AND HAVE BEEN HAVING THE SAME PROBLEM. I AM PULLING A 45OO LB BOAT WHEN THIS HAPPENS, BUT THIS IS UNDER THE WIEGHT LIMIT FOR THE TRUCK. I JUST GOT THE TRUCK OUT OF THE SHOP WHERE THEY PUT NEW SHIFT PIONTS IN THE COMPUTER, FOR HEAVY PULLING. I AM LOOKING FOR ANYBODY THAT IS HAVING THE SAME PROBLEM OR ANYBODY THAT HAS A SOLUTION. THEY TELL ME THIS MODLE YEAR (2001) IS THE FIRST YEAR THEY PUT THE 4R70W TRANSMISSION BEHIND THE 5.4 ENGINE. LUCKY ME!