Thank you all for this site. I needed to fix my E4OD that was slipping and not "locking-up". It was pretty much useless. I looked on here and found lots of posts. I am far from a gifted mechanic but I was still able to fix the problem by replacing and adjusting the FIPL. It works great and you saved me lots of time and money. I spent about $40 including the new FIPL and star wrenches.