Answer at a glance: the Rubicon uses a Rock-Trac two-speed transfer case with a 4:1 low-range (NV241OR in current models), a setup that underpins its off-road crawl capability.
Jeep’s Rubicon is designed for trail work, and the transfer case is a core component of that capability. Below is a detailed look at what the transfer case is, how it works across generations, and what it means for driving both on-road and off-road.
How the Rock-Trac transfer case works on the Rubicon
The Rubicon’s Rock-Trac transfer case is a two-speed design that provides a high-range (1:1) and a low-range (4:1). In practice, this means you can drive normally in 4x4 High for everyday use, or engage 4x4 Low when you need maximum torque and slow-speed crawling over obstacles. The low-range gearing multiplies engine torque, helping the vehicle scale steep grades, sand, rocks, and mud with greater control.
Generations and variants
JK era (2007–2018)
During the JK generation, Rubicon models adopted the Rock-Trac NV241OR two-speed transfer case. This setup paired with the Rubicon’s off-road-focused features (such as selectable front and rear locking differentials on many builds) delivered strong crawl performance. The 4:1 low-range remains the key feature for off-road speed control and torque delivery.
JL era (2018–present)
In the JL generation, Jeep continued using the Rock-Trac transfer case on Rubicon models, maintaining the two-speed, 4:1 low-range arrangement (NV241OR). The system is part of the Rubicon’s broader chassis and axle package designed for trail use, with the same emphasis on low-end torque and predictable control at slow speeds.
Older versus newer Rubicons
While modern Rubicons across JK and JL generations rely on the Rock-Trac NV241OR two-speed transfer case, earlier Wranglers used different transfer-case configurations. The shift toward Rock-Trac in the Rubicon line is tied to its emphasis on off-road capability, with the 4:1 low-range being the standout feature for crawls and technical terrain.
Before diving into practical takeaways, here is a concise overview of the transfer case’s defining aspects on a Rubicon:
- Two-speed design with a 1:1 high range and a 4:1 low range.
- Nava NV241OR designation in current models, part of the Rock-Trac family.
- Standard on Rubicon trims across recent generations, contributing to enhanced crawl ratios.
- Integral to overall off-road capability when paired with locking differentials and appropriate axles.
These features collectively give the Rubicon a substantial crawl capability, enabling controlled progress over rocks, logs, and steep ruts while maintaining steering precision and traction.
Maintenance and common considerations
Owners should follow standard transfer-case maintenance schedules, including fluid checks and replacements as recommended in the owner’s manual. If you frequently tow or drive in extreme off-road conditions, keep an eye on seals, fluid levels, and the operation of the transfer-case lever or electronic selector, depending on year and spec.
Summary
The Jeep Wrangler Rubicon’s transfer case is a Rock-Trac two-speed unit (NV241OR) with a primary advantage: a 4:1 low-range that delivers exceptional low-speed torque for difficult terrain. This configuration has been standard in recent JK and JL Rubicon models, contributing to the Rubicon’s reputation as a capable trail machine.
In brief
For anyone evaluating a Rubicon or considering upgrades, the transfer case is the Rock-Trac NV241OR two-speed, featuring a 4:1 low-range. This remains a core element of the Rubicon’s off-road capability across modern years.
Summary: The Rubicon’s transfer case is built around a Rock-Trac two-speed system with a 4:1 low-range (NV241OR), central to its trail-focused performance from JK through JL generations.
What Jeeps had the 242 transfer case?
The Jeep NP242 transfer case was introduced in the 1987 model year as a replacement for the NP228. The 242 premiered in the XJ Cherokee / Wagoneer and MJ Commache as the SelecTrac option. It was then specified for then new 1991-1998 ZJ Grand Cherokee model.
What transfer case is in a CJ5?
Dana 18 Transfer Case Specs - CJ-5
| Dana 18 Specs: | |
|---|---|
| Transfer Case | All Models |
| Make | Spicer |
| Model | 18 |
| Shift Lever | On floor |
What transfer case does a Rubicon have?
Rock-Trac NV241OR transfer case
The Jeep Wrangler JL Rubicon is equipped with the Rock-Trac NV241OR transfer case. This advanced system offers a 4:1 low-range gear ratio, which provides superior torque multiplication for challenging off-road conditions such as rock crawling and steep terrain.
What Jeeps had Dana 300 transfer case?
The Model 300 is found in these vehicles: 1980 to 1986: CJ5, CJ7 & CJ8.