First thing is checking if anything's wrong with it. The front sway bar end links can fail for example - they usually make a lot of noise first.
If there's nothing already wrong with it and you need more lateral stiffness you can install performance swaybars - Hellwig makes one that's popular for the rear.
Digressive valved shocks can produce a much sportier feel on cornering as well, like Bilstein HD is a popular choice for a stock height truck. They're available for both 2wd and 4wd.