Interesting because ive had some slams, one time i thought the rear end dropped out on a downshift on the freeway. I saw there was a new TSB on these trans, but I cant remember what its for. flyingwrenches had it on his youtube.I think the root cause was the torque converter but don't have the specifics. My transmission has been in and out of the shop 2-3x per year over the past 3-4 years do to various issues. Multiple TSB's for PCM resets and dealer keeping my truck for sometimes 3 weeks to make sure it shifts smooth. Once I get it back, I have no problems then around 3-4 months later when I put the car from P or R to D, it slams into gear and the gravy train starts all over again and the symptoms will start to appear while driving at lower to medium speeds. Had one instance when I was highway driving and it shifted really hard and scared the crap out of me. Been super frustrating to deal with over the years and I'm glad Ford finally approved this replacement. I do have an 8yr/100K extended warranty that I purchased from Flood Ford which, to me, is an absolute necessity.