Hard downshifting - resolved!!!!
 

My new 2016 XC60 AWD T6 Premier went thru an issue with hard downshifting between 4 to 3. Brought it into the dealer who worked on it for about 10 days. The diagnosed problem was a faulty valve body. Took a lot of research to find out what that was and its interrelationship to the transmission. By the way, the 2016 XC60 has switched to an eight speed automatic with sport. I believe it is an AISIN product, but have yet to find the exact match (might be AWF8F35 or 45). Back to the hard downshift...After replacing the valve body, the car runs smoother than silk. The dealer said it was still in "adapt" mode, but research indicates otherwise. This is my 5th Volvo (1990-740; 1991-760T; 2000-S80T6; and 2001 S80 2.9), and certainly the most serious problem encountered, given there was only about 1,600 miles on it. The shifting is much smoother and I have even noticed an increase in gas mileage after receiving the TCM update and new valve body. Beginning to fall in love again with this car! VFL!!!!!!!!!! I'll post more when I can get to the paperwork.