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Parking lock, location/task/design/function - GF27.10-P-5100N

TRANSMISSION 722.9 in MODEL 171.4, 203, 230 up to Model Year 8 

TRANSMISSION 722.9 in MODEL 209, 211, 215, 219, 220 

TRANSMISSION 722.9 in MODEL 463.303/340/341 

Fig 1: Identifying Parking Pawl Gear And Park Pawl Mechanism
G07287836Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Park pawl, location The park pawl gear (4) and park pawl mechanism (4a) are located in the rear area of the transmission housing.  
Park pawl, task Secures the vehicle mechanically to prevent it from rolling in addition to the parking brake.  
Park pawl, design   GF27.10-P-5100-03N 
Park pawl, function   GF27.10-P-5100-02N