Mazda CX-9 Grand Touring 2009 Manual page 601

Fig. 12: Identifying Rear Differential Components & Torque Specifications
Courtesy of MAZDA MOTORS CORP.
LOCKNUT REMOVAL NOTE
1. Lock the hub by applying the brakes.
2. Knock the crimped portion of the locknut outward using a small chisel and a hammer.
3. Loosen the locknut.
4. Temporarily tighten the locknut.
CAUTION:
2008 Mazda CX-9 Grand Touring
2008 DRIVELINE/AXLES Differential - Mazda CX-9
Do not remove the locknut when lowering the rear differential.
Otherwise, the rear drive shaft could fall and cause injury, or
damage the part.