Transfer Case: Description and Operation

TRANSFER CASE - NV140

DESCRIPTION

NV140 Cross Section:

The NV140 is a single-speed transfer case and it is used in the Quadra-Trac I Full-Time 4-Wheel Drive System. It provides full-time 4-wheel drive. The transfer case operates with an open center differential dividing engine torque nearly evenly with 48 percent of engine torque to the front axle and 52 percent of engine torque to the rear axle. The Brake Traction Control System, which combines standard ABS and Traction Control, provides resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction.

The Quadra-Trac I system with NV 140 single-speed transfer case provides the following benefits:
- No shift lever or driver interaction required.
- Full-time four-wheel drive provides smooth operation and vehicle stability under all conditions because torque is constantly being transferred.
- Even torque distribution provides traction to maintain forward motion under most conditions.
- The Brake Traction Control System (BTCS) works in tandem with full-time four-wheel drive. BTCS provides resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction.
- Robust design and improved sealing enhance reliability.
- No maintenance required.

OPERATION
Full-time 4-wheel drive distributes even torque to all wheels under all conditions. The transfer case center differential evenly divides torque to the front and rear axles, while also allowing the driveshafts to rotate at different speeds to account for front and rear wheels traveling different distances while turning. Given that the drive shafts can rotate at different speeds, the vehicle can remain in full-time 4-wheel drive mode indefinitely, even on dry pavement, without threat of damage to the drivetrain. The vehicle uses Brake Traction Control to modulate the torque from one wheel to another across each axle and the transfer case.