I just put Monroe Reflex's on the front of my new (to me) '98 12 valve 2500 2WD, and the Sensa-Tracs on the rear. The Reflex is a heavy duty, stiff shock made for 3/4 and 1 ton trucks, which is the reason I use them under the Cummins. I wanted a softer ride on the rear, because my pasture is not noted for it's smoothness. I'm very pleased with the ride on all road surfaces, as well as in the pasture.
Same PN for the 2500 and 3500 2WD trucks.
Reflex PN: 911191
Sensa-Trac PN: 37103