I have an 08, it is exactly the same. There is no dipstick, they want the dealer to check the fluid level. I got a dipstick from an 06-07 Liberty which fits but doesn't accurately measure the fluid. I used the stick from the 06-07 to make my own. What I did was had the dealer confirm the level was in fact full from the factory, drove the Jeep around for 30 miles, stopped and let it idle in park for about 3 minutes, measured the temperature on a corner of the pan [and recorded it] then cut a hot fluid level into the stick. I then checked the level several times over a period of a few weeks after at least 20 minutes worth of driving [temp +/- about 10 degrees F of the original reading], and the level always comes to that mark that I cut in the dipstick.
I also fooled around with the cold level, but the hot level after 3-5 minutes of idling in park after a 20-30 minute ride works best. HTH