Mazda 6 Service Manual: No.7 no shifting

No.6 low maximum speed and poor acceleration no.7 no shifting

No.8 does not shift to fourth gear (4gr)

Other materials:

Mazda 6 Service Manual: Wheel hub, hub spindle pre-inspection
Wheel Bearing Play Inspection 1. Position a dial indicator against the wheel hub. 2. Push and pull the wheel hub by hand in the axial direction and measure the wheel bearing play. Maximum wheel bearing play 0.05 mm {0.002 in} 3. If the bearing play exceeds the specification, replace a ...

Mazda 6 Service Manual: Intermittent concern troubleshooting
  Vibration Method 1. If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the steps below. Note There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the things to check for are: ...