Low Speed (Rattle) Under Load
Thread Starter
|
Cross-Country
Joined: Jul 2010
Posts: 75
Likes: 14
Low Speed (Rattle) Under Load
Ok guys. Over the last month on my gas 2018 F250 I have a very annoying "rattle" under a light load. I thought one of the heat shields had come loose or a clamp had broken but I have been all under the truck and they are all fine. It only does it under a light load going uphill with very light pedal pressure and then will quit when giving it more throttle. I can't find anything under the truck that is loose and no repairs have been done for a while. Possible tranny or torque converter issue? Truck does have 165,000 freeway miles on it but runs flawlessly.
Thanks,
Shane
Thanks,
Shane
4wd High
Joined: Dec 2023
Posts: 9
Likes: 3
Hi Shane!
Any update on this issue?
I’ve got a 2018 F250 gas, Super cab, long bed, 136k miles that does exactly the same thing. I would call it a vibration/rattle. No clue what’s causing it. I did pull off a bunch of heat shielding material (fiber pad with aluminized coating on one side) that had come loose and was hanging down around the muffler - can’t remember for sure, but I may have noticed the noise sometime after that…… I’m just about to take the truck in to a local mechanic and see if they can find anything.
John
Any update on this issue?
I’ve got a 2018 F250 gas, Super cab, long bed, 136k miles that does exactly the same thing. I would call it a vibration/rattle. No clue what’s causing it. I did pull off a bunch of heat shielding material (fiber pad with aluminized coating on one side) that had come loose and was hanging down around the muffler - can’t remember for sure, but I may have noticed the noise sometime after that…… I’m just about to take the truck in to a local mechanic and see if they can find anything.
John
Cargo Master
Joined: Sep 2013
Posts: 3,258
Likes: 1,321
From: Pryor, OK
I had this on my '19 F250 gasser. I bought the truck new and brought it in with less than 3000 miles because of this issue. The Ford tech told me, "The noise is coming from the rear pinion bearing and it's a known vibration. There is no fix for it and not to worry about it too much." How truthful this explanation is, I don't know. But you don't hear about the rear axle failing on these trucks. After a while, I didn't even notice it anymore.
Tuned
Joined: Feb 2017
Posts: 465
Likes: 38
While chasing a 65mph rumblestrip noise i looked for anything loose. I found loose and some missing heat shield material including clamps just resting on the exhaust.
Looking like my fix still is driveshaft balance.....
Looking like my fix still is driveshaft balance.....
Mountain Pass
Joined: Sep 2004
Posts: 165
Likes: 48
From: Howell Mi.
I have this on my 2021 and i believe its the muffler. I get a buzzy rattle under load at low rpms, but no other time. If i hit the muffler with a mallet i can replicate the sound. Its like a baffle inside the muffler has detached or come loose. Its not horrible but looking forward to replacing it. I think the harmonics of the engine and drivetrain come together at a certain RPM and it buzzes.
3rd Gear
Joined: Aug 2025
Posts: 3
Likes: 0
Ok guys. Over the last month on my gas 2018 F250 I have a very annoying "rattle" under a light load. I thought one of the heat shields had come loose or a clamp had broken but I have been all under the truck and they are all fine. It only does it under a light load going uphill with very light pedal pressure and then will quit when giving it more throttle. I can't find anything under the truck that is loose and no repairs have been done for a while. Possible tranny or torque converter issue? Truck does have 165,000 freeway miles on it but runs flawlessly.
Thanks,
Shane
Thanks,
Shane
Trending Topics
3rd Gear
Joined: Aug 2025
Posts: 3
Likes: 0
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
3rd Gear
Joined: Aug 2025
Posts: 3
Likes: 0
I have taken a dead blow to it and it makes zero noise with full swings😇 does anyone have an idea on how to test the muffler by changing the flow?
Cargo Master
Joined: Sep 2013
Posts: 3,258
Likes: 1,321
From: Pryor, OK
Just delete it. If you remove just the muffler, it will change the tone very little. Some say that it will improve power and mileage. I didn't notice much of anything but a change in tone. The muffler shop charged me less that $100 and they made it capable of replacing the new pipe section with the muffler again if I wanted to.
Thread
Thread Starter
Forum
Replies
Last Post
bentcipher
1999 - 2016 Super Duty
25
Oct 23, 2010 10:29 PM
COramprat
1997 - 2006 Expedition & Navigator
8
Jun 21, 2007 10:46 AM
unclehan
General Automotive Discussion
14
Sep 12, 2005 12:47 PM