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Switching into 4wd, there is a continuous noise, is this just the connector or a serious problem?

2007 3.7l
 

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electronically shifted transfer case

Here is a Link that explains the the electronically shifted transfer case provides two mode positions:
• Two-wheel drive high range (2WD).
• Four-wheel drive high range (4WD LOCK).

Dodge Nitro: Four-wheel drive operation - Starting and operating - Dodge Nitro Owner's Manual

I did find a used switch for $20.00 that could help determine that your switch is O.K. HERE Otherwise I really don't have an answer for your issue. Sorry & Good Luck.

If you figure it out please post your resolve and WELCOME>
 

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With an automatic transmission, the MP 140 single-speed transfer case is used in Nitro's new Full- Time FourWheel Drive System. It provides convenient full-time four-wheel drive operation and functions seamlessly with Nitro's standard Traction Control and ESP (Electronic Stability Program) features to provide enhanced traction and stability on low-traction surfaces. The MP designation refers to Magna Powertrain, the successor to New Venture Gear.

The MP140 single-speed transfer case provides the following benefits:
Convenient operation: No shift lever or driver interaction required. Smooth operation and vehicle stability under all conditions because torque is constantly being shared among all wheels. Traction to maintain forward motion under most conditions through 48 front/52 rear percent torque distribution. Enhanced traction and stability provided by the Traction Control and Electronic Stability Program (ESP) working in tandem with full-time four-wheel-drive. Traction Control and ESP provide resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction. Robust design and sealing for reliability. No maintenance required.
OPERATION
TRANSFER CASE - MP140
Full-time 4-wheel drive distributes torque to all wheels under normal driving conditions. The transfer case uses an open (unlocked) center differential to divide engine torque nearly evenly between the front and rear axles - 48 percent to the front axle and 52 percent to the rear axle. The open differential allows the front and rear drive shafts to rotate at different speeds to account for front and rear wheels traveling different distances when turning. Because the drive shafts can rotate at different speeds, the vehicle can remain in full-time 4-wheel drive mode continuously - even on dry pavement - without threat of damage to the drive train. The standardequipment ESP, which combines ABS, Traction Control, and Electronic Roll Mitigation, enhances traction by modulating torque among all wheels as necessary - providing resistance to any wheel that is slipping while allowing torque to flow to the wheels with traction.


Available with both manual and automatic transmissions, the MP143 single-speed, part-time transfer case is used in Nitro's new Part-Time Four-Wheel Drive System. Two-wheel drive and four-wheel drive modes are electronically controlled via a switch in the center console. Either mode can be selected at any time. The MP143 transfer case works with standard-equipment Traction Control and ESP (Electronic Stability Program) features to provide enhanced traction and stability on low-traction surfaces.
Two operating positions: 2WD and 4Lock controlled via a switch in the center console. For temporary conditions that require extra traction such as snow or mud, the part-time 4Lock mode locks the main shaft and drive sprocket hub, making the front and rear wheels rotate in unison and offering maximum traction. Enhanced traction and stability provided by Traction Control and ESP working in tandem with part-time four-wheel-drive. Traction Control and ESP provide resistance to any wheel that is slipping to allow additional torque transfer to wheels with traction. Robust design and sealing for reliability. Maintenance free.

In 2WD mode, the front axle and driveshaft turn freely while power is sent to the rear axle and wheels. In 4Lock mode, the front and rear wheels rotate in unison, resulting in remarkable traction. Because this is a parttime system, it locks the front and rear drive shafts together. Therefore, it can only be used on slippery or loose surfaces like ice, gravel, or rugged terrain. The standard-equipment ESP, which combines ABS, Traction Control, and Electronic Roll Mitigation, enhances traction by modulating torque among all wheels as necessary - providing resistance to any wheel that is slipping while allowing torque to flow to the wheels with traction.
The MP143 transfer case also has an analog shift actuator mounted on the rear of the transfer case that communicates with the switch through the CAN-bus network.
 
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