why does my Ford F-150 13th Generation (2015-2020) make a loud noise when in 4WD

Ford F-150 13th Generation (2015-2020)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

519 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix loud noise in 4WD for Ford F-150 13th Generation (2015-2020). Step-by-step guide with diagnostic and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before working on the drivetrain components.

Symptoms

•Loud grinding or clunking noise when in 4WD
•Difficulty engaging or disengaging 4WD
•Vibration felt through the chassis when in 4WD
•Unusual wear on tires
•Check engine or 4WD warning light illuminated

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related trouble codes.
2
Inspect the transfer case fluid level and condition; look for contamination or metal shavings.
3
Check the front differential fluid level and condition.
4
Visually inspect the driveshafts and CV joints for damage or excessive play.
5
Test the operation of the front axle engagement system.
6
Listen for noise with the vehicle on a lift while engaged in 4WD to isolate the source.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Torque wrench
•Fluid pump
•Screwdrivers

Parts Required

•Transfer case fluid
•Front differential fluid
•CV joint or axle assembly (if needed)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to check for any related trouble codes.
2
Inspect the transfer case fluid level and condition; look for contamination or metal shavings.
3
Check the front differential fluid level and condition.
4
Visually inspect the driveshafts and CV joints for damage or excessive play.
5
Test the operation of the front axle engagement system.
6
Listen for noise with the vehicle on a lift while engaged in 4WD to isolate the source.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a flat surface and engage the parking brake.
Disconnect the battery to ensure safety.

2. Fluid Inspection and Replacement

Transfer Case Fluid Replacement:
- Remove the drain plug and allow old fluid to drain completely.
- Inspect fluid for metal shavings or debris.
- Replace with manufacturer-recommended fluid (e.g., Mercon LV).
- Reinstall the drain plug and torque to manufacturer's specification (typically 20-25 lb-ft).
Front Differential Fluid Replacement:
- Remove the front differential drain plug and allow fluid to drain.
- Inspect for contaminants and replace with manufacturer-recommended fluid.
- Reinstall the drain plug and torque to specification.

3. Inspect and Repair Drivetrain Components

Inspect Driveshafts:
- Check for bent or damaged driveshafts.
- Replace any damaged components as necessary.
- Ensure all bolts are tightened to specification.
CV Joint Inspection:
- Examine CV joints for wear or damage.
- If damaged, replace the entire axle assembly or the joint itself.
- Ensure proper lubrication during reassembly.

4. Test Front Axle Engagement System

Inspect the actuator and linkage for any signs of damage.
Ensure proper operation by manually engaging and disengaging the system.
Replace components as necessary.