DRIVELINE 1ST ORDER VIBRATION/BOOM/DRONE
FORD: 2002-2005 Explorer
MERCURY: 2002-2005 Mountaineer
LINCOLN: 2003-2005 Aviator
ISSUE
Some 2002-2005 4x4 Explorer 4dr/Mountaineer and 2003-2005 4x4 Aviator vehicles may exhibit a vibration/drone/boom at 55-75 MPH (89-121 km/h). Electronic vibration analyzer (EVA) readings will fall under 1st order rear driveshaft at 2700-3100 shaft RPM (45-52 Hertz).
SERVICE PROCEDURE
1. With the vehicle in NEUTRAL, position it on a hoist. Refer to Workshop Manual Section 100-02.
2. Remove skid plate, if equipped.
3. Remove the driveshaft flange bolts (Figure 1).
4. Remove the transfer case rear output flange bolts (Figure 2). Download File PDF
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