FYI its a good idea / recommended to change front / rear differentials - transfer case and manual transmission at 30,000
Front / Rear Diff's use
GL5 LT 75/85 - Transfer Case is LF 75W Use Toyota Brand...... (expensive BUT its the right stuff and only uses 1 Liter)
Whatever you do remember you MUST use
GL4 for the manual transmission. I use MT90 from Red Line.
Red Line Company has all of these special blends (so do "other" companies BUT if you go wrong with these oils, you are replacing expensive stuff.
MANY transmissions shops will fill the transmission with GL5 as most cars today will accept it,...... it WILL destroy the syncro-bushings.
The Tacoma is a GL4 MT6, do not let anyone talk you into using GL5 it will eat the metals and the transmission is done.
The Transfer case also has brass components. Do not try and find a cheaper easy way around the GL4 requirement.
Watch the whole thing for ALL the info............ BUT I will start here
Source: https://youtu.be/3le9ZT5HUlk