The clutch plates are broken.

Replace the clutch plates. Refer to the following:

1. Locking Differential Disassemble
2. Locking Differential Clutch Disc Assembly Disassemble
3. Locking Differential Cam Unit Disassemble
4. Locking Differential Cam Unit Assemble
5. Locking Differential Assemble

The thrust block is broken.

Replace the thrust block with a block of identical thickness. Check closely for other damage. Refer to Locking Differential Disassemble and Locking Differential Assemble .

The case is damaged.

Replace the unit. Refer to Differential Replacement in Rear Drive Axle.

The differential gears are broken.

Replace the gears. Refer to the following:

1. Locking Differential Disassemble
2. Locking Differential Clutch Disc Assembly Disassemble
3. Locking Differential Cam Unit Disassemble
4. Locking Differential Cam Unit Assemble
5. Locking Differential Assemble