The subframe is responsible for connecting the suspension control arms, and sway bar to the chassis.
When the bushings start to break down, they allow deflection in the suspension starting from where it meets the chassis. If you are going to be replacing these bushings you might want to consider upgrading them. Just remember the harder compound, all the way to solid bushings, will result in a harsher ride. Also, the suspension geometry is based on the relation of the subframe to chassis. If you are going with solid bushings make sure you do your research on the height of the subframe before replacing them.
There is a lot of work that needs to be done before you can remove the subframe, but don't worry you can find it all provide by following the links. The procedures are the same for both sides with the exception of the headlight leveling system on the left coffin arm.
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Project Time: 8hr
Tab: $250
Tools: 16mm, 18mm wrench and sockets, 10mm socket,
Parts Required: New subframe bushings
Performance Gain: Tighter suspension
Complementary Modification: Control arm bushing upgrades