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The dealer, a junk yard, EBAY........
It is in the center of the differential cover.
2.5
75w90
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
Inside the rear axle.
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.
Dana 216 FBI (Dana 44)
My Dodge Ram 1500 is in the shop right now for the same thing. They are telling me its the rear differential.
It is on the top center of the rear axle.
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.
It is just as strong as a 4wd. Obviously it will not have the traction of a 4wd though.