Jeep Liberty/Transfer Cases
Transfer cases for the Jeep Liberty are built by New Venture Gear, hence the NV prefix. New Venture inherited New Process Gear from Chrysler, therefore the older transfer cases are prefixed with NP. Whether prefixed with NV or NP, parts are interchangeable between the same transfer case model.
Full-time 4WD can be used on pavement because it utilizes the differential in the transfer case. Part-time 4WD Lo and 4WD Hi can't be used on pavement because they lock the axles together in the transfer case. While the 2WD, full-time 4WD, and part-time 4WD Hi modes support the maximum vehicle speed, the part-time 4WD Lo mode does not. Part-time 4WD Hi should not be engaged over 55mph. Essentially, part-time 4WD should be used for off-road, full-time 4WD for maximum traction on-road, and 2WD for everything else.
NV231J
editThe NV231J, utilized in the Command-Trac system, is a mechanically shifted part-time transfer case. Its chain-driven aluminum construction makes it weaker than gear-driven iron transfer cases.
| Mode | Gear Ratio |
|---|---|
| 2WD | 1.00:1 |
| 4-HI Part Time | 1.00:1 |
| N | N/A |
| 4-LO | 2.72:1 |
NV241J
editThe NV241J, also known as Command-Trac HD, is sometimes incorrectly referred to as an "NV231J-HD". It was available in the 2005-2007 Jeep Liberty (KJ) with the 6-spd transmission in any package. The transfer case is tagged "241J" in these applications and uses the same gear ratios as the NV231J. This is not the limited production NV241OR found in the Wrangler Rubicon models.
NV242
editThe NV242, also known as Select-Trac, is a mechanically shifted full time transfer case.
| Mode | Gear Ratio |
|---|---|
| 2WD | 1.00:1 |
| 4-HI Part Time | 1.00:1 |
| 4-HI Full Time | 1.00:1 |
| N | N/A |
| 4-LO | 2.72:1 |
Slip Yoke Eliminator
editA slip yoke eliminator replaces the slip yoke in the rear of the transfer case with a fixed yoke. Primarily this allows for the installation of double cardon joints and reduces the driveshaft angle by increasing the driveline length. These two changes help cut down on vibration caused by lifting the Jeep. As an added benefit, it prevents the transfer case from spilling fluid everywhere if the driveshaft gets pulled out. When installing a slip yoke eliminator, a drive shaft with an integrated slip yoke and double cardon joints must also be installed.