rearend hot and smoking. How do I put in rear end grease? on 2004 Dodge Ram 1500

Whines upon acceleration, decreases when let up on gas pedal. Drove about 5 miles to home and rear end over heating and smoking

Asked by for the 2004 Dodge Ram 1500
Should be able to find fill pug on side of diff. housing. I hate to say it but I think you need to find a shop that can repair, overhaul, or replace that puppy.