hello. just got a '16 gt with performance pack. love it!

for the transmission fluid, what are some of the popular ones? i don't know if the performance pack is any different from the standard gt with manual transmission from the manual it appears they recommend the same type from ford across the board.

same question on the rear differential, in the manual they talk about an additive, but then it doesn't mention anything different for the torsen.

i've searched but not much luck. appreciate the responses.

thanks,