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Take it to the shop your overrun clutch has departed or the sprag failed.
I just have to wonder what is gained by going to a shift kit anyway, my A4 will fry the tires on a WOT 1-2 and bark them once in a while on a 2-3.
At one time I had Super Chips programming because I changed my axle ratio to 3.42 and it was to hard shifting so I sent it back and they lowered the line pressure but left the torque managment disabled.
I now have Ed Wright programming because of my ATI and the shifts are normal unless you stand on it. :D