The 10R80 10 speed transmission in my truck has failed, due to the steel to aluminum drum being different materials it cause pre mature catastrophic failure. the damaged components resulted in needing a full overhaul/rebuild of my transmission at my full expense. my ford dealer stated there is a known tech service bulletin about this exact failure which means ford knows there’s a problem but will not fix it. the resulting damage was the sun gear has failed, the drum has failed, and there are chunks missing from gears 5,6 and 7, which also resulted in needing a new valve body, and new torque converter. i opted to take my ranger to a independent shop as i no longer trusted ford to rebuild the transmission correctly and i do also have the failed components. The safety issues were losing all drive train function randomly when in operation, on several occasions this happened on the freeway at freeway speeds, or sitting in stop and go traffic and the the truck would just rev but not go anywhere, both scenarios have happened with my kids in the vehicle putting there lives in danger. Yes the problem has been confirmed by both the ford dealer and the independent transmission shop. yes i brought the parts to the ford dealer to look at, but they do remain in my possession. no, there were lights or indicators that a failure was happening, ive done all the ford recommended maintenance at the time it was due, the hard shift had always been there but i was told that’s just how it was on multiple occasions. this is a known issue and i have spoken with several other 2019-2023 ford ranger owners and majority have had the exact same issues occur.