Hi everybody. I have a 2010 F-150 XLT SuperCrew Cab with the 4.6L 3-Valve V8 with the 6-speed automatic transmission. What I'm here to discuss today is my transmission. It's really got me worried with the truck at almost 10,000 miles only. This has happened 2 times, both while on the highway. If I'm going about 65MPH on the highway and I start up a hill the transmission clunks and shifts down hard. The vibration can be felt under your feet all throughout the truck and then it goes away. Otherwise, this transmission shifts very smooth. Does anybody else have this problem? I'm debating with myself whether to take it in or not because it don't happen VERY often plus it shifts smooth 95% of the time. Let me know what you guys think below. I love my truck and it's been very handy, but this can't be happening. Thanks FTE!