Super easy, easiest fluid on the truck to change. Open fill plug (to make sure it comes off) then open the drain plug, let it drain out. I used about 1/2 qt of new fluid to get more of the dirty fluid out. Replace drain plug and pump in new fluid. Calls for 1 1/2 qt but I just kept adding until it started dripping out the fill plug. Once it stopped dripping replace plug. Both plugs for some thread sealant added. Actual fluid was just over 1.5 qt. That fluid change was at 20,200 miles/5 years interval. Kinda dark in my opinion but ATF changes quickly anyhow.