You may want to seek professional help to replace the shocks. You could try searching http://www.yellowpagecity.com/ for your nearest mechanic. Otherwise, try searching for websites which detail how to replace shocks in cars.
The best way is to remove the bottom bolt and bend it all around until the top breaks then start the new shocks and tighten the nuts at the top through the fenderwell.
One will find the answers to this question at NissanPartsZone. There are also tutorials on YouTube. The best way to really replace rear shocks on a 2005 Altima would be to take it to a mechanic.
You best and easiest way of doing this is to replace your OEM shocks with air shocks, unless it has struts in the rear.
An easy way to tell when your shocks are worn out is to push down on the car to make it bounce. It should stop and come to rest after about two motions. If it continues much past that, you likely need new shocks.
The cost of the shocks is going to be anywhere from $55 to $85 each. If a professional is doing the replacement, there will also be a labor charge from them for their time and knowledge. If doing the replacement oneself, please refer to a manual on the proper way to replace the shocks to prevent unintentional damage to the vehicle.
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you do mean shocks and not airbags right? well, you change shocks on the rear just like any other car with them but on a Lincoln the best way is to have the car resting all the way down,"with the airbag switch off". place a jack directly on the rearend and raise the vehical a little to release tension off the bolts. it's easier to put them on this way cause when you buy new shocks they are already compressed and its hard to pull or extend a compressed shock.
The best way to replace shocks and struts on a 2001 Buick Park Avenue Ultra is to follow the owner's manual instructions. The parts can be purchased at most local auto parts stores such as Auto Zone. Remove the old parts and refer to the manual to install the new parts.
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Shocks are oil filled, so if you see oil on the shock body or drips on the ground, replace immieditly. Other than that, it's really hard to say since the way a shock dampens degrades slowly over time and is not noticed. Also, the type of vehicle and the way it's used will also contribute to the shocks life. If you are in doubt, take it to your favorite mechanic and ask his advice.