Jeep 4×4 Systems Explained: Command-Trac, Rock-Trac, Quadra-Trac

Wareing Belle Fourche CDJR

What each Jeep 4×4 system does, and which one fits how you drive.

Jeep uses several 4×4 systems. Command-Trac is the part-time Wrangler system, Rock-Trac is the Rubicon crawl system, and Quadra-Trac I and Quadra-Drive II are the full-time systems on Grand Cherokee. Knowing which one a Jeep has tells you how it behaves on dry pavement, in snow, and on the trail.

System details below come from jeep.com, checked November 2, 2026. Fitment changes by model, year, and trim. Check the window sticker or ask our team to decode the VIN.

Part-time vs full-time 4×4

A part-time system runs in two-wheel drive until you shift into 4×4. In 4WD it locks the front and rear driveshafts together, which gives strong traction on dirt, snow, and rock. It should not stay in 4WD on dry pavement, since the axles cannot turn at different speeds in tight corners.

A full-time system can send power to all four wheels at any time, including on dry roads. That makes it easy to live with on winter highways. Some full-time systems also have a low range for steep or slow terrain. Quadra-Trac I is single-speed and has no low range.

Jeep 4×4 systems at a glance

The Rubicon crawl ratio of 100:1 applies with the manual transmission and the available 4.88:1 axle ratio, per Jeep.

Command-Trac and Rock-Trac on Wrangler

Command-Trac is the part-time Wrangler system. Jeep lists a 2.72:1 low range for rock crawling and a neutral position that is part of the flat-towing procedure. Check the owner’s manual for your exact model and powertrain before you flat tow behind an RV.

Jeep lists Rock-Trac on the Wrangler Rubicon in part-time form, with a full-time Rock-Trac system available on equipped models. Its 4:1 low range gears the Rubicon down for slow, controlled travel over rocks and steep ground. Rubicon also adds Tru-Lok electronic front and rear lockers and an electronic sway bar disconnect for more front axle travel. Compare trims in our Wrangler trim levels guide.

Quadra-Trac I and Quadra-Drive II on Grand Cherokee

Grand Cherokee uses full-time systems built for daily driving first. Quadra-Trac I keeps power flowing to all four wheels without a driver input. Quadra-Drive II adds a rear electronic limited-slip differential that helps move torque to the rear wheel with grip.

On equipped models, Selec-Terrain adds a dial with modes such as Auto, Sport, Rock, Snow, and Mud/Sand. Available modes vary by trim. For western South Dakota winters, a full-time system is easy to live with, and a Snow mode helps if your Jeep has one. See how it stacks up in our Durango vs Grand Cherokee comparison.

Which Jeep 4×4 system fits you?

• Mostly winter highways and town: a full-time system like Quadra-Trac I.
• Snow plus ranch lanes and gravel: Quadra-Drive II or a Wrangler with full-time 4×4.
• Trail days and rock crawling: Rock-Trac on a Rubicon.
• Flat towing behind an RV: a Wrangler with a transfer case neutral position. Confirm the procedure in the owner’s manual.

Whatever you choose, follow the owner’s manual maintenance schedule, including the severe-use schedule if you spend time on trails. Our Jeep 4×4 service team handles those inspections.

Jeep 4×4 systems FAQ