Interesting...what's the problem? Losing power, slipping, or something else? Not a common thing to hear about, the 6R80 has been in service with Ford products since 2007. The 6R80 is a licensed reproduction of the ZF 6HP26, which has been used in European brands since 2002.
It's not very common to hear of issues, so I'm curious to hear what yours is doing.
His: 2015 F-150 XLT Crew, 3.5L EcoBoost
Hers: 2015 T-350 LWB LR wagon, 3.7L V6