For 07-13 Expedition 07-13 Navigator Front (2) Coil Spring Strut Conversion kit. Within continent all United States. 2007-13 Ford Expedition without Electronic Suspension Front Driver Side & Passenger Side. 2007-13 Lincoln Navigator without Electronic Suspension Front Driver Side & Passenger Side. How to check if the shock absorber is working well? Under normal circumstances, oil leakage in the shock absorber means that there is a problem with your shock absorber. You should repair it at this time to avoid abnormal operation of the shock absorber. Press the bumper firmly, and then release it. If the car jumps 2 or 3 times, it means that the shock absorber is working well. When the car is driving slowly and braking urgently, if the car vibrates violently, it means there is a problem with the shock absorber. The car stops after driving 10km on the road with poor road conditions and touches the outer shell with your hands. If the temperature is not high enough, it means that there is no resistance inside the shock absorber and the shock absorber does not work. At this time you should know if it is time to replace the shock absorber. Precautions for replacing the shock absorber! Professional tools must be used during installation, and the shock absorber must not be forcibly installed. During the assembly process, be sure to protect the surface of the piston rod, and avoid using tools to pull the piston rod or bump or scratch the piston rod, otherwise the shock absorber will leak oil. All nuts should be new and tightened according to the specified parameters of the vehicle to ensure that the tightening torque of the connection part meets the specified parameters of the vehicle. When tightening the nuts of the connecting part, it should be carried out in the natural state of the tire and meet the specified parameters of the vehicle.