Is it possible to get 2 cycle oil into the trany case. I have a 94 polaris 300 and there seems to be 2 stroke oil that normally mixes with the gas in my trany case if something is broke would the oil be able to get in there?  

if it is a seperate transmission or the PVT transmission then no.  but the tranny does use a polaris synthetic gear oil that looks like 2 cycle.
i wouldn't anything but.  

oh i just thought of something.
if it's the pvt tranny and the shift shaft seals are worn out, and your carb. overflow leaks on them, it is possible to get fuel and or oil in the tranny if it
is leaking directly on the shifter shaft.
but you'd almost have to mix your fuel and oil in the tank rather than use the premixer.  

i have a 2001 polaris sportsman 90 . i have a oil cap to check for the tranny does hydrolic fluid go in here or what goes in here  

no don't put hydro fluid in there.

go to polaris and buy the tranny fluid.