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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.
There is no concrete answer. Different vehicles have different needs. For instance, an off-road vehicle may need a differential fluid change as often as every 30,000 miles. A vehicle used for everyday travel may never need a differential fluid change. Some manufactures consider the differential lubed for life and others recommend that it be changed at a set mileage like 100,000 miles. Refer to your owner's manual for when or if yours should be changed.
3 hours
30,000
Every 30,000 miles
every 50,000 miles
When its old
Automatic transmission fluid should be changed according to the manufacturer's suggestions. Many manufacturers suggest having the fluid changed at every 100,000 miles.
I recommend every 50,000 miles.
25000 milee
60,000 miles
Generally every 30000 miles unless you have synthetic fluid, and the transfer case as well.