4WD mastery has always been at the core of the Jeep® brand. You can expect to Go Anywhere, Do Anything™ in a Jeep® vehicle, thanks to over 69 years of tried and true off-road craftsmanship. Wrangler Unlimited has two 4WD systems: Rock Trac® and Command-Trac®. Heavy-duty sill guards (a.k.a. rock rails) are bolted directly to the frame for added body strength and to resist twisting when sliding over rocks and boulders. Added Jeep® capability is evident from Wrangler Unlimited's outstanding ground clearance.