I swapped out OEM transmission and rear differential fluids with Redline synthetic (MT-85 and 75W90, respectively)
Piece of cake DIY, though my friend's ramps on a sloped incline do not provide near the clearance that my four jacks stands in my garage do.
Left the brake and clutch fluid for another day (maybe when I replace rotors and pads). I will swap the power steering fluid in the reservoir at home this weekend.