I just finished putting new shocks on my 89 F-150, the PO never thought about replacing them. So it was a bumpy ride considering it has almost 200K miles. I went with Napa shocks, but if i would have had the money, i wouldve gotten Bilsteins. Im not sure, but they might have the right shocks for you. Of course, these shocks give you a stiffer ride, which gives you better performance out of your pickup.
Drew