Hyundai / Kia (2004 up)
Coupling Assembly-4WD
NOISE DIAGNOSE AND FIX
47800-39000 (BorgWarner 51-02-027-001)
Coupling Assembly 4WD makes the same noise as the rear differential.

Youtube music:

Finland - TrackTribe
Fingerprint - Mini Vandals
Come Get With Us - TrackTribe
Bloody Tears - Quincas Moreira
Sunset Trails - DJ Williams
Emerald Seas - Aaron Kenny