The proper level depends on the fluid temperature, so you’ll need both a dipstick and a reasonably good infrared thermometer to get the right amount of fluid. I think you can buy the Mopar dipstick with the correct graduations on it, and check the technical manual for the right fluid height/temperature range.
https://www.moparpartsinc.com/p/Jeep_2008_Liberty-SPORT-4x4--37L-V6--4-Spd-Automatic-VLP-42RLE-Trans/42373019/52118641ad.html
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