19 ram 1500 big horn rear diff

[JohnTheWelder]

I own a 5th gen big horn 1500. Was wondering how I can figure out what the gearing in the rear diff is so I know what fluid to do a drain and fill. Sits at 68k never towed anything but I’m a little late on that rear diff service.. as well as wondering how I could find which transmission is in the truck so I can complete that service as well. Per alldata it says there is 2 options for this truck 8HP50 and 8HP75

 

[PurpleRT]

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