it isn't fun to pull the cover it is tight the easiest is to get some type of small hand pump and suck it out
Dana 216 FBI (Dana 44)
The differential fluid on a Dodge Ram 1500 4x4 needs to be changed every 50,000 miles for normal highway driving. If the vehicle is used in 4x4 regularly, then change the differential fluid about every 25,000 to 30,000 miles.
It is in the center of the differential cover.
the rear is called a 9 1/4 the front, if 4wd, is a Dana 44
75w90
2.5
Front holds 3.5 pints Rear holds 4.9 pints
Enough so it is level with the bottom of the hole, Usually a quart or two.
most 1500 dodges have a Chrysler 9.25 differential in the rear, some had Dana setups most 1500 dodges have a Chrysler 9.25 differential in the rear, some had Dana setups
If there is not a drain plug on the bottom of the differential then you will have to remove the cover. Be sure that you service it with the proper fluid and positraction additive if it is a positraction differential.
Just fill it until the lube runs out the fill hole. It is now full.
Inside the rear axle.