There are 2 different types of jacks which may be found in these vehicles. Most of the earlier vehicles were equipped with a bumper jack from the factory. This jack utilized slots in the bumper to raise the car. Later vehicles were equipped with a scissor jack that used a locating pin which was inserted into the vehicle's frame rails and the vehicle was lifted using the frame rail. The jack is used on the frame rail just behind or in front of the wheel well, whichever direction is just slightly toward the center of the car when compared with the wheel wells. The jack supplied with the car should never be used for any service operation other than tire changing. Never get under the car while it is supported by only a jack. Always block the wheels when changing tires.
On most vehicles a floor jack may be used on the front crossmember or the rear axle
Service operations in this guide often require that one end or both ends of the car be raised and safely supported. The ideal method, of course, would be a to use a hydraulic hoist. Since this is beyond both the resource and requirement of the do-it-yourselfer, a small hydraulic, screw or scissors jack or floor jack will raise the vehicle sufficiently for almost all procedures in this guide. But the vehicle must still be supported by two sturdy jackstands if you intend to work under the car at any time. An alternate method of raising the car would be drive-on ramps. These are available commercially or can be fabricated from heavy boards or steel. Be sure to block the wheels when using ramps. Never use concrete blocks to support the car. They may break if the load is not evenly distributed.
Regardless of the method of jacking or hoisting the car, there are only certain areas of the undercarriage and suspension you can safely use to support it. The front and rear crossmembers and the side frame rails and generally safe areas by which to support these vehicles. But be careful not to contact and damage other components such as stabilizer bars or the exhaust system. Also, it is advisable to protect the vehicle's undercarriage from scratches that will promote corrosion. To help prevent unnecessary scratches a block of wood should always be positioned between the jack or jackstand and the vehicle. Be especially careful that you do not damage the catalytic converter. Remember that various cross braces and supports on a lift can sometimes contact low hanging parts of the car.