Jeep® 4x4 Systems Explained for Wind River & Sinks Canyon Drivers: Command-Trac® vs. Selec-Trac® vs. Rock-Trac®
Selecting the right Jeep® 4x4 transfer case determines how your vehicle handles black ice on WY-789 between Lander and Riverton, blown-in snowdrifts over South Pass (WY-28), and high-clearance granite ledges along the Loop Road above Sinks Canyon State Park. While every 2026 Jeep Wrangler and Jeep Gladiator carries a Trail Rated® badge and solid Dana® axles, the transfer case underneath dictates whether you must shift manually between 2WD and part-time 4WD, whether you have an automatic full-time 4H Auto mode for mixed winter pavement, and how much low-range torque multiplication (2.72:1 vs. 4.0:1) reaches the wheels.
At Fremont Motor Lander Chrysler Dodge Jeep Ram (1731 W Main St, Lander, WY), our team helps Wind River Basin drivers match the exact factory transfer case and axle combination to their daily highway routes and backcountry trails. Below is the verified mechanical breakdown of Command-Trac®, Selec-Trac®, and Rock-Trac® across the 2026 Jeep lineup and pre-owned inventory.
Side-by-Side Transfer Case Comparison: Command-Trac® vs. Selec-Trac® vs. Rock-Trac®
Review the verified 2026 manufacturer hardware specifications below to see how operating modes, low-range gearing, and trim availability differ across Jeep's three body-on-frame 4x4 systems:
| Specification / Hardware | Command-Trac® (NV241 / MP1622) | Selec-Trac® (MP3022) | Rock-Trac® (NV241OR & MP3022OR) |
|---|---|---|---|
| System Architecture | Part-Time, 2-Speed Shift-on-the-Fly Transfer Case | Full-Time Active 2-Speed Transfer Case | Heavy-Duty 2-Speed Part-Time (NV241OR) or Available Full-Time (MP3022OR) |
| Transfer Case Lever Positions | 2H, 4H Part-Time, N (Neutral), 4L |
2H (N/A on Moab 392), 4H Auto, 4H Part-Time, N, 4L |
Part-Time: 2H, 4H, N, 4LFull-Time: Adds 4H Auto |
| Low-Range Gear Ratio | 2.72:1 Low-Range Reduction | 2.72:1 Low-Range Reduction | 4.0:1 Extreme Low-Range Reduction |
| 2026 Wrangler Availability | Standard on Sport, Sport S, Willys & Sahara (2-Door & 4-Door) | Standard on Moab 392 (Full-Time 4WD); widely available on pre-owned Sahara & Sport S | Part-Time Standard on Rubicon; Full-Time Standard on Rubicon X (Optional on Rubicon) |
| 2026 Gladiator Availability | Standard on Sport, Sport S, Willys & Mojave (MP1622) | Optional on Gladiator Mojave (MP3022) | Part-Time Standard on Gladiator Rubicon; Full-Time Included on Rubicon X |
| Dry Pavement Operation in 4H | No — Use 4H Part-Time only on snow, ice, mud, gravel, or dirt |
Yes (in 4H Auto) — Safe on bare, wet, and patchy winter asphalt |
Part-Time: No (loose surfaces only) Full-Time: Yes (in 4H Auto) |
| Maximum Crawl Ratio (2026 Specs) | Up to 57.2:1 (Wrangler 3.6L V-6 Manual w/ 4.10 axle); 52.5:1 (Auto w/ 4.10 axle) | 49.2:1 (Wrangler Moab 392 w/ 8HP75 Auto & 4.56 axle) | Up to 100:1 (Wrangler 3.6L Manual w/ opt. 4.88 axle); 77.2:1 (Wrangler & Gladiator Auto w/ 4.10 axle) |
| Best Fremont County Application | Snow-covered highways, gravel forest roads, ranch tracks & flat-towing behind an RV | Daily winter commuting between Lander, Riverton & Dubois across alternating dry and icy roads | Technical Wind River boulder crawling, steep Shoshone National Forest ledges & deep snow |
1. Command-Trac® (NV241 / MP1622): Proven Part-Time 4x4 for Snowpack & Two-Track Trails
Command-Trac® is Jeep's traditional, mechanically locked part-time four-wheel-drive system. It comes standard on the 2026 Jeep Wrangler Sport, Sport S, Willys, and Sahara, as well as the 2026 Jeep Gladiator Sport, Sport S, Willys, and Mojave. For ranchers, hunters, and outdoor drivers around Lander and Fort Washakie who want direct mechanical engagement without complex clutch packs, Command-Trac delivers dependable traction.
- Shift-on-the-Fly Engagement: Drivers can shift manually from
2WD High(rear-wheel drive for maximum highway fuel economy on dry pavement) into4WD Highwhile moving at speeds up to 45 mph when approaching snow-packed stretches on US-287 or turning onto dirt county roads. - Why "Part-Time" Matters on Wyoming Highways: In
4H Part-Time, Command-Trac mechanically locks the front and rear driveshafts together at a 50/50 split with no center differential. Because front and rear wheels travel different arcs during a turn,4H Part-Timeshould only be used on slippery or loose surfaces (snow, ice, mud, sand, or gravel) where tires can slip slightly to relieve driveline tension. Once you drop out of Sinks Canyon onto bare, sun-dried Main Street in Lander, shift back into2Hto prevent driveline binding and tire hop in parking lots. - 2.72:1 Low-Range Gear Reduction (
4L): Shifting the transfer case into Neutral (while rolling at 2 to 3 mph) and pulling firmly into4Lmultiplies engine torque by 2.72 times. Paired with the 850RE 8-speed automatic transmission (4.71:1 first gear) and a 4.10:1 axle ratio on the Wrangler Willys or Gladiator Mojave, this produces a 52.5:1 crawl ratio—providing strong engine braking down steep switchbacks from Frye Lake or Worthen Meadow Reservoir. - Paired with Rear Lockers on Willys & Mojave: On the 2026 Wrangler Willys, Gladiator Willys, and Gladiator Mojave, Command-Trac works alongside 3rd-generation heavy-duty Dana® 44 solid front and rear axles and a standard Tru-Lok® electronic locking rear differential. On the desert-tuned Gladiator Mojave (11.6 inches of ground clearance and FOX 2.5-inch internal bypass shocks), drivers can even lock the rear Tru-Lok differential in
4WD Highfor high-speed stability across loose sand and deep snowdrifts. - Heavy-Duty Utility & Towing: When equipped with the standard 285-hp 3.6L Pentastar® V-6 (260 lb.-ft. of torque), 8-speed automatic transmission, and Max Trailer Tow Group (4.10:1 wide-track axles), the 2026 Gladiator Sport S with Command-Trac achieves up to 7,700 lbs of maximum towing capacity and up to 1,720 lbs of payload when properly equipped.
2. Selec-Trac® (MP3022): Full-Time 4WD Auto for Patchy Wyoming Winter Commutes
Anyone who drives between Lander, Riverton, Hudson, and Dubois from October through April knows that Wyoming winter highways are rarely 100% snow-covered or 100% dry. Wind-scoured stretches of bare asphalt alternate every half-mile with shaded canyon curves coated in black ice and blowing snow. That exact scenario is why Jeep engineered the Selec-Trac® MP3022 full-time transfer case.
How 4H Auto Works on Mixed Pavement
Unlike a part-time transfer case that forces a rigid 50/50 lock, Selec-Trac adds a 4WD Auto position controlled by an electronically modulated multi-plate clutch pack:
- Continuous Torque Modulation: On dry pavement, the system sends power primarily to the rear axle so you can make tight turns on dry asphalt without binding or crow-hopping.
- Instant Slip Response: The moment wheel-speed sensors detect rear slip on an icy bridge deck over the Popo Agie or Wind River, the transfer case smoothly engages the front axle to maintain directional stability.
- Set-and-Forget Winter Convenience: You can leave the lever in
4H Autofor your entire winter commute without constantly shifting back and forth between2Hand4H.
Where to Find Selec-Trac® in Lander
Selec-Trac retains a true 2.72:1 low-range gear ratio (4L) and a Neutral position for flat-towing, giving you both full-time winter convenience and trail low range:
- 2026 Jeep Gladiator Mojave: Available as a factory upgrade (
MP3022 Selec-Trac), pairing4H Autowith Mojave's 11.6 inches of ground clearance, 4.10:1 wide-track Dana 44 axles, and 6,000-lb max towing capacity (when properly equipped). - 2026 Jeep Wrangler Moab 392: Comes standard with a permanent full-time MP3022 Selec-Trac transfer case (
4WD Auto,4WD High,Neutral,4WD Low) to harness its 470-hp 6.4L V-8 engine (470 lb.-ft. of torque) and standard 35-inch BFGoodrich KO2 tires. - Pre-Owned Wrangler Sahara & Sport S: Many late-model pre-owned Wrangler Sahara, Overland, and Sport S SUVs on our Lander lot feature Selec-Trac full-time 4WD.
3. Rock-Trac® (NV241OR / MP3022OR): 4:1 Low-Range Torque for Technical Wind River Trails
Reserved exclusively for the Jeep Wrangler Rubicon / Rubicon X and Jeep Gladiator Rubicon / Rubicon X (plus Moab 392's Rubicon-grade axle hardware), Rock-Trac® is built for extreme off-road obstacles in the Wind River Range, Owl Creek Mountains, and Christina Lake trail network.
- 4.0:1 Low-Range Gear Ratio: While Command-Trac and Selec-Trac use a 2.72:1 low range, Rock-Trac steps down to an ultra-deep 4.0:1 low-range ratio—delivering 47% more low-range gear reduction. This allows your Wrangler or Gladiator to inch up stair-stepped granite ledges at under 2 mph without riding the clutch or overheating the transmission torque converter, and descend steep rocky grades using engine compression alone.
- Part-Time (NV241OR) vs. Full-Time (MP3022OR) Rock-Trac: Standard Rubicon trims carry the part-time NV241OR transfer case (
2H,4H Part-Time,N,4L). Upgrading to the Rock-Trac Full-Time transfer case (MP3022OR)—which is standard on the 2026 Wrangler Rubicon X and Gladiator Rubicon X, and optional on Rubicon—gives you the best of both worlds:4H Autofor icy Wyoming highway driving plus the4.0:1low range for technical rock crawling. - Up to 100:1 Crawl Ratio: A 2026 Wrangler Rubicon equipped with the 285-hp 3.6L Pentastar V-6, 6-speed manual transmission (5.13:1 first gear), 4.0:1 Rock-Trac transfer case, and available 4.88:1 axle ratio achieves an industry-benchmark 100:1 crawl ratio (84.1:1 with the standard 4.10:1 axle ratio). With the 8-speed automatic transmission (4.71:1 first gear), both the Wrangler Rubicon and Gladiator Rubicon deliver a 77.2:1 crawl ratio (or 85.9:1 on Wrangler Rubicon models equipped with the 4.56:1 Xtreme 35 Package).
- Complete Rubicon Drivetrain Integration: Rock-Trac is engineered to work in unison with Tru-Lok® front and rear electronic remote locking differentials, an electronically controlled front sway-bar disconnect (providing a 770 Ramp Travel Index on 4-door Wrangler Rubicon and 890 on 2-door), and a 3rd-generation Full-Float Dana 44 heavy-duty solid rear axle on Wrangler Rubicon.
- Verified Rubicon Clearances & Towing: The 2026 Wrangler Rubicon 4-door provides 10.8 inches of standard ground clearance (or 12.9 inches with the Xtreme 35 Package's LT315/70R17C 35-inch tires and 34.0 inches of water fording) and tows up to 5,000 lbs when properly equipped with the 8-speed automatic and 4.10:1 axle ratio. The 2026 Gladiator Rubicon delivers 11.1 inches of ground clearance on 33-inch Falken Wildpeak A/T tires and tows up to 7,000 lbs when properly equipped.
Quick Guide: When to Use Each Transfer Case Mode in Central Wyoming
Whether your Jeep is equipped with Command-Trac, Selec-Trac, or Rock-Trac, using the right transfer case position protects your driveline and maximizes traction:
2H & 4H Auto (Highway & Town)
2H(Two-Wheel Drive High): Use on dry or wet paved highways (US-287, WY-789) during spring, summer, and clear winter afternoons for optimal fuel efficiency and zero driveline bind.4H Auto(Selec-Trac & Full-Time Rock-Trac): Engage whenever winter temperatures drop and roads alternate between dry pavement, slush, and black ice. Safe for continuous highway speeds on any surface.
4H Part-Time (Loose & Snow-Covered Roads)
- When to Engage: Shift on the fly (up to 45 mph) when the road surface is continuously covered in snow, ice, mud, gravel, or sand—such as climbing Sinks Canyon during a snowstorm or driving graded county dirt roads.
- When to Disengage: Shift back to
2Hor4H Autoas soon as you return to bare, dry pavement and before making tight parking-lot turns.
4L & Neutral (Technical Trails & Flat-Towing)
4L(Four-Wheel Drive Low): Shift while rolling slowly (2 to 3 mph) with the transmission in Neutral. Use for steep rocky climbs, boulder fields, deep snowdrifts, or controlled low-speed descents below 25 mph.N(Neutral): Disengages both axles from the transmission so properly equipped Wrangler or Gladiator models can be flat-towed (dinghy towed) all four wheels down behind an RV when following the official Owner's Manual procedure.
What About Jeep Unibody SUVs? (Grand Cherokee, Cherokee & Compass 4x4 Systems)
While Command-Trac, Selec-Trac, and Rock-Trac are engineered specifically for the body-on-frame Wrangler and Gladiator, Jeep's unibody SUVs use active all-wheel-drive and 4x4 systems that engage automatically on winter roads without requiring manual lever shifts on dry pavement:
- Jeep® Grand Cherokee & Grand Cherokee L (Quadra-Trac I®, Quadra-Trac II® & Quadra-Drive® II): Quadra-Trac I operates as a full-time single-speed 4x4 system, while Quadra-Trac II adds a two-speed transfer case with a 2.72:1 low-range ratio and Selec-Terrain® traction management. Quadra-Drive II adds a rear electronic limited-slip differential (eLSD) for maximum winter and trail grip.
- Jeep® Compass & All-New 2026 Jeep® Cherokee (Jeep Active Drive & Active Drive Low): Features a rear-axle disconnect that automatically switches between efficient front-wheel drive on dry highways and active 4x4 the instant slip occurs. On the 2026 Compass Trailhawk (200-hp 2.0L Turbo I-4, EPA-estimated 24 mpg city / 32 mpg highway / 27 mpg combined), Jeep Active Drive Low adds a 20:1 crawl ratio and Selec-Terrain Rock Mode. To see how these trims stack up, read our companion guide: Jeep Trailhawk vs. Rubicon vs. Willys: Which Off-Road Trim Fits Your Wind River Backcountry Drives?
4x4 Transfer Case Maintenance & Fremont Care in Lander, WY
Climbing steep grades over South Pass, fording high-country snowmelt streams in Shoshone National Forest, and operating in sub-zero Wind River Basin temperatures place heavy thermal and mechanical loads on your transfer case and Dana differentials. Our factory-trained Mopar® service technicians at Fremont Motor Lander CDJR recommend inspecting transfer case and differential fluid condition before winter and after deep-water trail crossings, and replacing transfer case fluid at factory-scheduled intervals (typically every 30,000 to 60,000 miles depending on severe-duty trail or towing use).
- Fremont Care on Eligible Vehicle Purchases: New Jeep vehicles and eligible pre-owned vehicles purchased at Fremont Motor Lander CDJR come with Fremont Care, which provides 2 oil changes and 2 tire rotations within the initial 12 months of ownership on qualifying vehicle purchases—helping keep your tires wearing evenly so your 4x4 system operates smoothly.
- Fremont Certified Pre-Owned Inspection Standards: Every qualifying Fremont Certified pre-owned Jeep 4x4 undergoes a thorough 70-point mechanical and safety inspection by our factory-certified technicians—including 4WD engagement and drivetrain checks—and includes clean CARFAX® vehicle history verification plus a 3-month/3,000-mile limited warranty.
Frequently Asked Questions: Jeep Command-Trac vs. Selec-Trac vs. Rock-Trac
Can I drive a Jeep with Command-Trac in 4H on dry pavement?
No. Command-Trac® is a part-time 4x4 system that mechanically locks the front and rear driveshafts together with no center differential. Driving in 4H Part-Time on bare, dry pavement prevents the front and rear axles from rotating at different speeds during turns, causing driveline binding ("crow-hopping"), premature tire wear, and transfer case strain. Only engage 4H Part-Time on snow, ice, mud, sand, or gravel. If you want a 4WD mode that can stay engaged on alternating dry and icy pavement, choose a Jeep equipped with Selec-Trac® or Full-Time Rock-Trac® and use 4H Auto.
What is the difference between Selec-Trac and Rock-Trac Full-Time 4WD?
Both Selec-Trac® (MP3022) and Rock-Trac® Full-Time (MP3022OR) include a 4H Auto mode that uses an electronically controlled clutch pack to automatically proportion torque between the front and rear axles on mixed winter roads. The key difference is the low-range gear reduction and trim hardware: Selec-Trac has a 2.72:1 low-range ratio, whereas Rock-Trac Full-Time (standard on Wrangler Rubicon X and Gladiator Rubicon X, and optional on Rubicon) features a heavy-duty 4.0:1 low-range ratio paired with front and rear Tru-Lok® locking differentials and a disconnecting front sway bar.
How do I shift my Jeep Wrangler or Gladiator into 4WD Low (4L)?
To shift smoothly into 4WD Low (4L) without gear clash, slow your Jeep to a rolling speed of 2 to 3 mph (do not come to a complete stop if the gears resist meshing), shift the automatic transmission into Neutral (N) (or depress the clutch pedal on a 6-speed manual), and pull the transfer case lever firmly and steadily through Neutral into 4L without pausing in transfer-case Neutral. Once engaged, shift the transmission back into Drive.
Can all three Jeep transfer cases be flat-towed behind an RV?
Yes, when properly equipped and operated in accordance with official manufacturer guidelines. Every 2026 Jeep Wrangler and Jeep Gladiator equipped with Command-Trac®, Selec-Trac®, or Rock-Trac® features a true mechanical Neutral (N) position in the transfer case. When shifted into transfer-case Neutral and used strictly according to the owner's manual recreational towing procedure, properly equipped models may be flat-towed with all four wheels on the ground behind a motorhome.
Compare Command-Trac®, Selec-Trac® & Rock-Trac® in Person at Fremont Motor Lander CDJR
Ready to test-drive a new 2026 Jeep Wrangler, Jeep Gladiator, or Grand Cherokee and see how each 4x4 system feels on Fremont County roads? Visit Fremont Motor Lander Chrysler Dodge Jeep Ram at 1731 W Main St, Lander, WY 82520 or call our team at (307) 335-3359. We proudly serve drivers from Lander, Riverton, Dubois, Fort Washakie, Hudson, Pinedale, and across central Wyoming.
Disclaimers & Disclosures: All vehicle specifications, transfer case gear ratios, crawl ratios, ground clearance figures, approach/breakover/departure angles, and EPA fuel economy estimates are based on official 2026 Stellantis/Jeep manufacturer specifications at the time of publication and vary by trim, drivetrain, and configuration. EPA-estimated 24 mpg city / 32 mpg highway / 27 mpg combined applies to the 2026 Jeep Compass Trailhawk 2.0L Turbo I-4 with 8-speed automatic transmission; actual mileage will vary depending on driving habits, elevation, and weather conditions. Maximum towing and payload capacities vary by model, drivetrain, axle ratio, transmission, and equipment; examples include up to 7,700 lbs towing and 1,720 lbs payload on 2026 Gladiator Sport S with 4.10 axle ratio and Max Trailer Tow Group, up to 7,000 lbs towing on 2026 Gladiator Rubicon, up to 6,000 lbs towing on 2026 Gladiator Willys and Mojave, and up to 5,000 lbs towing on 2026 Wrangler 4-door Rubicon with 4.10 axle ratio and 8-speed automatic transmission when properly equipped. Proper equipment and factory towing packages are required; never exceed gross vehicle or gross combined weight ratings. Flat-towing (recreational towing) capability requires proper equipment and strict adherence to the step-by-step procedure in the official Jeep Owner's Manual.
Fremont Care & Fremont Certified Disclosure: Fremont Care comes with eligible new and qualifying pre-owned vehicle purchases and provides two (2) oil changes and two (2) tire rotations within the initial 12 months of ownership. Fremont Certified Pre-Owned vehicles include a 70-point mechanical and safety inspection by factory-certified technicians, clean CARFAX® vehicle history verification, and a 3-month/3,000-mile limited warranty (see Fremont Motor Lander CDJR for complete written warranty details and program eligibility).