Most Pre 94 vehicles use R12 refrigerant..........but you can convert to 134A without too much dificulty.
r-134
5w30 or 10w30
ATF +4
R134aR134a
Infinity
R-12
5w30
To get an owner's manual at a cheap price, would be on Ebay. Just type "Plymouth Voyager" and you'll get results. Hope this helps.
A 1991 Chrysler Voyager can use ATF+3 or ATF +4.
probably r135
5w30 or 10w30
5w30 or 10w30