Just changed my tranny fluid (Pentosin MTF2) last week, it was putrid black. Wiped it on a clean white bounty towel just to check for a hint of a yellow/brown color. Not a single drop of any shade of brown! I think the towel even wanted to puke.
The differential fluid (Motul 300), however was still a medium maple syrup color.
60K-mile interval seems OK for the differential. I won't be going 60K miles again before changing my tranny fluid.