Refer to your owner's manual, shop manual, or transmission dipstick if equipped (the fluid part number is sometimes on there) for the proper fluid for your application. This automatic transmission is found in the applications with the 6.4 Turbo Diesel and some gas engine Super Duty truck applications. The part number is XT-10-QLVC (updated from XT-10-QLV) and is commonly referred to as Mercon LV. This is sold by the quart. Case pricing including shipping is offered here.