BIG BORE XD® Cylinder Assist® Steering Kit – Jeep Wrangler YJ (1987–1989)

PSC’s Cylinder Assist Steering Kits give your Jeep the extra muscle it needs to handle off-road terrain with confidence — and still feel right at home on the highway. Whether you’re crawling rocks or cruising to work, PSC components deliver smooth, reliable steering without the twitchy oversteer or arm fatigue you get from lesser setups.

This kit’s built for early YJ owners running AMC 4.2L (258ci), 2.5L (150ci), or 304 engines — especially if you’re rolling on 35s or anything in that 32–37" range. If you want better control on the trail without giving up that familiar road feel, this is the upgrade that makes it all work.

The steering gear’s tuned for daily-driven Jeeps that still get dirty, with increased torque output and smoother handling. The Cylinder Assist® acts like a dynamic steering stabilizer — soaking up trail chatter and road feedback so your gear and pump don’t take a beating.

It bolts up clean with factory brackets and hose assemblies, and the pump works with your stock pulley and serpentine belt setup. No weird fab work, no guesswork — just solid parts that fit and perform.