The transfer case uses Synthetic ATF, I forget which number. The manual trans...well that's all over the place, some use 10-30 motor oil, to Royal Purple, Red Line, Lucas
I use the purple stuff, synthetic and according to the label, does not contain anything corrosive......regular 75-90 gear oil may contain corrosives.....they will damage your synchros.
2013 WRANGLER SPORT 2 DR., V-6 ,AUTO,HARD TOP
)1994 Jeep Wrangler 2.5L, Bestop top
/w steel half door and slider windows
5 speed, 2.5" lift, 31" tires,rack lights