The S-10 began life as a two-wheel-drive pickup. Hummel removed all of the IFS parts and installed a simple leaf spring suspension and solid axle. The leaf springs are “hybrid” and include Dodge Durango rear-application leaves (Hummel was still in the process of tuning the springs for the weight of the Cummins when we photographed the truck) and the shocks are from a Dodge 1-ton application. The axle is a Dana 44 from a ’79 Ford F-250 and it has been fitted with 4.10:1 gears, a Lock-Right differential, and Yukon 4340 chromoly axleshafts. The steering system consists of a Chevy Astro van steering box and pitman arm, Avalanche Engineering high-steer arms, and a 1 1/2-inch-diameter, 0.250-inch-wall drag link and tie rod with right hand-thread QA1 rod ends (less spares to carry). “All hydro lines are adapted to the same fitting sizes so I can carry one long piece of hose and two ends. I can then make up whatever I need on the spot,” Hummel says.