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2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard

Israel

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Crossing through a small ditch at a 45 degree I noticed a knocking sound. My son crawled under and discovered the drive shaft was hitting the fuel tank gard anyone else have this issue?
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Heat shield?
 

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No unfortunately.
It looks like you have different wheels and tires – do you have factory suspension or FX4 or other mods?
What was the suspension doing?
Was it right rear wheel up or down, right front wheel up or down?
I'll go twist up my truck and get a photo to see what mine does.
I've been meaning to do this to look at getting a better sway bar for on-road handling and then have a quick release for off-road.

I'll probably just twist it up till a front tire comes off the ground then repeat for a rear tire to come off the ground then repeat for the other side.
 
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Israel

Israel

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It looks like you have different wheels and tires – do you have factory suspension or FX4 or other mods?
What was the suspension doing?
Was it right rear wheel up or down, right front wheel up or down?
I'll go twist up my truck and get a photo to see what mine does.
I've been meaning to do this to look at getting a better sway bar for on-road handling and then have a quick release for off-road.

I'll probably just twist it up till a front tire comes off the ground then repeat for a rear tire to come off the ground then repeat for the other side.
The front right tire is up and the right rear is almost off the ground. The tires and rims are not factory. It came with 20’s and I put on 18’s with 33” Cooper stt pros. I just had a 3”rough country lift kit put on Friday and it dose the same thing.
 
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Israel

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Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard 54807137-099F-4FBC-B891-9F2795EB183C
 

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I put crossed up my truck, but couldn't see any way for the driveshaft to get near the tank. I tried to get some photos, but nothing came out clearly. Also, my truck is a 6.5 bed and yours is a 5.5 and modified, so I don't think I'm much help to you. But I did get a look at how the suspension flexes (I'm looking to get a stiffer rear sway and quick-release links for better on-road cornering and still decent front/rear articulation.) I was impressed by how the rear could flex, but the front doesn't have much travel.

Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard right rear compression


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard left front compression


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard right rear droo


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard left rear droo
 

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The droop in the previous photos were the point at which the tire unweighted and slipping … just adding the diff lock in 2WD was enough to inch forward after losing traction in 2WD with the diff open.
I took photos underneath but they came out dark and blurry. I could eyeball the drive shaft and didn't see a problem, but I was also no interested in crawling under the truck while it was twisted up.
I've added a few photos just to show max droop and the (lack of) compression in the front suspension which really could have a lot more travel. I'm guessing the sways are holding it up.

Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard IMG_20210802_161829


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard IMG_20210802_161826


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard IMG_20210802_161732


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard IMG_20210802_161731


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard IMG_20210802_161253


Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard IMG_20210802_161240
 

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no photos but happened to me on a road trip recently.

rubbing or vibrations felt under rear cab when moving, loud clanks when you back up.

ended up being heat shield that came loose. wife felt it drop or come loose while sitting in drive-thru a day or two earlier.
 

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no photos but happened to me on a road trip recently.

rubbing or vibrations felt under rear cab when moving, loud clanks when you back up.

ended up being heat shield that came loose. wife felt it drop or come loose while sitting in drive-thru a day or two earlier.
Im getting the exact same symptoms. Heading to dealer this morning, ill report back with findings.
 

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By the time I got to the dealer, it had stopped. At least I got to meet the "good" service writer and establish that relationship for the future.
 
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By the time I got to the dealer, it had stopped. At least I got to meet the "good" service writer and establish that relationship for the future.
Did they say anything about it being a issue that’s becoming more and more?
 
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So I have taken a video of this. And pictures of the angle
Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard 0759B289-EBDA-4022-B7A8-3D82A63D532F
Ford F-150 2021 FX4 PowerBoost hybrid drive shaft rubbing the fuel tank guard C01CCD80-5254-451B-984C-57ABB59ABAD4

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