My rear differential needs replaced. What haopens if it blows while driving?

What is your question?

Replaced all brakes, rotors, and ball joints. Squirley when accelerator and control is slightyly compromised. If i hit a bump in the road I come down Hard, and sometimes feel out of control. Springs are about to break loose. Constant whining from rear end...especially when accelerating

How long has your 2000 Dodge Durango had this problem?

Months