Strange metal grinding/rattling noise while driving?

ILLEROMM

MEMBER
2018 FORD F-150
3.6L
6 CYL
TURBO
4WD
AUTOMATIC
75,000 MILES

While I am driving and only accelerating above 50 MPH, there's a metal rattling/grinding noise that's loud and lasts about 3 seconds and then just disappears. It only happens while I am accelerating. If I let off the gas it stops immediately and it only starts when I hit over 50 MPH. I just had a lift kit put on my truck and the noise never happened before this lift kit.

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,415 POSTS

Can you please shoot a quick video with your phone so I can hear the noise? That way I can tell for sure what's going on. You can upload it here with your response.

Here is a guide that can help:

https://www.2carpros.com/articles/vehicle-grinding-noise

Here is what is said about the noise from your truck:

The metal rattling/grinding noise that you're experiencing in your 2018 Ford F-150, specifically after installing a lift kit and during acceleration above 50 mph, could be attributed to a few potential causes:

Exhaust System: One possibility is that the lift kit installation may have caused the exhaust system to come into contact with other components, such as the frame or body. This contact could result in the rattling or grinding noise you're hearing. Check for any signs of exhaust components rubbing against other parts or if any mounting brackets or hangers have become loose or misaligned.

Driveshaft or U-Joints: The lift kit installation might have altered the driveshaft angles or U-joint angles. If these angles are too extreme or misaligned, it can cause vibration or noise during acceleration. Inspect the driveshaft and U-joints for any signs of damage, such as worn or loose components, and make sure they are properly aligned.

Suspension Components: The lift kit installation may have affected the suspension components. Check for loose or damaged components, such as control arms, sway bar links, or suspension bushings. Ensure that all components are properly tightened and aligned.

Loose or Misaligned Parts: It's possible that during the lift kit installation, other components were not properly tightened or aligned, leading to the rattling/grinding noise. Check all bolts, brackets, and mounts associated with the lift kit and any nearby components to ensure they are securely fastened.

Heat Shields: Lift kit installations can sometimes affect the positioning of heat shields. If a heat shield is in contact with other components due to the lift, it can cause rattling or grinding noises. Inspect the heat shields and ensure they are properly positioned and not in contact with any other parts.

Since the noise started after the lift kit installation, it is highly likely that the issue is related to that. Please let us know what you find. We are interested to see what it is.