Since they give you no instructions on how to remove and install the speed senor, I prefer to tilt vehicle with jacking and air down tires. Next time I do it I will measure the degree of tilt required, as this is where the fill hole should have been placed.
This is only maintance problem I have discovered on H3, front and read axels have drain plugs and easy refill.

Save time next chang. Toward the top left rear of the trans case, by the crossmember. Add Exactly 250 ml (8.45 oz) of DEXRON®III fluid, install plug.

Fill hole was correct for all other applications, angles a bit different on the H3.

Thanks for the information, Do you know what other vehicles they use this transfer case in?