This also increases the torque available at the axles. Low range gears allow the vehicle to drive at much slower speeds while still operating within the usable power band / RPM range of the engine. In many transfer cases, this shifter is the same as the one that selects 2WD or 4WD operation. Low range gears are engaged with a shifter or electronic switch. The transfer case may contain one or more sets of low range gears for off-road use.This is the equivalent to the differential lock. when one of the axles is on a slippery surface or stuck in the mud, whereas the other has better traction). Transfer cases designed for off-road use can mechanically lock the front and rear drive shafts when the driver selects (e.g.This is also why a transfer case that is not designed for on-road use will cause problems with driveline windup if driven on dry pavement. If the transfer case did not make up the difference between the two different rates of rotation, binding would occur and the transfer case could become damaged. the rear to help with control (such as a 3.55:1 in the rear differential and a 3.54:1 in the front differential). Different rates of tire rotation are generally due to different tire diameters (since the front and rear tires inevitably wear at different rates) and different gear ratios in the front and rear differentials since manufacturers will often have a slightly lower ratio in the front vs. This is necessary because the front and rear tires never turn at the same speed. Transfer cases that are designed to allow for normal road use synchronize the difference between the rotation of the front and rear wheels, in much the same way the differential acts on a given axle.Such a transfer case is permanently "locked" into all-wheel-drive mode. Some vehicles, such as all-wheel-drive sports cars, have transfer cases that are not selectable. On some vehicles, this may be electronically operated by a switch instead. This is sometimes accomplished by means of a shifter, similar to that in a manual transmission. The driver can put the transfer case into either "two-wheel-drive" or "four-wheel-drive" mode. On some vehicles, such as four-wheel-drive trucks or vehicles intended for off-road use, this feature is controlled by the driver. The transfer case receives power from the transmission and sends it to both the front and rear axles, or just one (usually the rear.) This can be done with gears, hydraulics, or chain drive.It also synchronizes the difference between the rotation of the front and rear wheels, and may contain one or more sets of low range gears for off-road use. The transfer case transfers power from the transmission to the front and rear axles by means of drive shafts. Part-time/Manual, shift on the flyĪ transfer case is a part of the drivetrain of four-wheel-drive, all-wheel-drive, and other multiple powered axle vehicles. When installing a slip yoke eliminator, a drive shaft with an integrated slip yoke and double cardon joints must also be installed.Inside of a 231 New Process Gear transfer case. As an added benefit, it prevents the transfer case from spilling fluid everywhere if the driveshaft gets pulled out. These two changes help cut down on vibration caused by lifting the Jeep. Primarily this allows for the installation of double cardon joints and reduces the driveshaft angle by increasing the driveline length. Slip Yoke Eliminator Ī slip yoke eliminator replaces the slip yoke in the rear of the transfer case with a fixed yoke. The NV242, also known as Select-Trac, is a mechanically shifted full time transfer case. This is not the limited production NV241OR found in the Wrangler Rubicon models. The transfer case is tagged "241J" in these applications and uses the same gear ratios as the NV231J. It was available in the 2005-2007 Jeep Liberty (KJ) with the 6-spd transmission in any package. The NV241J, also known as Command-Trac HD, is sometimes incorrectly referred to as an "NV231J-HD". Its chain-driven aluminum construction makes it weaker than gear-driven iron transfer cases. The NV231J, utilized in the Command-Trac system, is a mechanically shifted part-time transfer case.
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