Rust on rear end of 2021 F-150 -- any others?

Daily22ssv

Well-known member
First Name
Adam
Joined
Dec 26, 2020
Messages
306
Reaction score
219
Location
Tx
Vehicles
21 F150 powerbost
Occupation
Tech
Found heavy rust on rear end and some on both shock mounts. Any others out there?
Advertisement

 

currybob

Well-known member
First Name
Bob
Joined
Aug 6, 2020
Messages
2,070
Reaction score
2,233
Location
Alexandria Alabama
Vehicles
2021KRF150 PB; 2020 LexusRX350; 2021 Mazda Miata
Occupation
Retired Physicist from federal government; Army Veteran
Found heavy rust on rear end and some on both shock mounts. Any others out there?
Yeah, I had some on the axle and shock mount. I sprayed some undercoating on it. I'm i the south so no salt but still didn't like see that on a new truck.
 

KBKEITH

Well-known member
Joined
Dec 9, 2020
Messages
659
Reaction score
544
Location
Michigan
Vehicles
2021 F-150 XLT SCREW 5.5, FX4, 2.7EB
Rusty rear end is inevitable for me. I don’t like it but there’s not much I can do.

My undercarriage looked very clean when I picked it up, but that was 2 months ago. I’m afraid to look now.
 

currybob

Well-known member
First Name
Bob
Joined
Aug 6, 2020
Messages
2,070
Reaction score
2,233
Location
Alexandria Alabama
Vehicles
2021KRF150 PB; 2020 LexusRX350; 2021 Mazda Miata
Occupation
Retired Physicist from federal government; Army Veteran
Rusty rear end is inevitable for me. I don’t like it but there’s not much I can do.

My undercarriage looked very clean when I picked it up, but that was 2 months ago. I’m afraid to look now.
Undercoating doesn't last?
 
Last edited:

KBKEITH

Well-known member
Joined
Dec 9, 2020
Messages
659
Reaction score
544
Location
Michigan
Vehicles
2021 F-150 XLT SCREW 5.5, FX4, 2.7EB
Undercoating it doesn't last?
I’ve actually never tried doing that to be honest. I’m thinking that the salt would eventually win the battle, but I could be wrong about that.
 

cakryg

Well-known member
First Name
Chris
Joined
Oct 8, 2020
Messages
112
Reaction score
113
Location
NY
Vehicles
2004 Tundra
Same here. There is absolutely no paint on the rear diff so rust is inevitable. I bathed everything in fluid film yesterday to get me through the winter. Will spray some rustoleum in the summer.
 

Pedaldude

Well-known member
Joined
Jan 27, 2021
Messages
524
Reaction score
545
Location
Arizona
Vehicles
2001 Lincoln Navigator, 2021 Ford F-150
The suspension deep dive video someone shared had a truck with a noticeable amount of rust. I was going to say something but being in AZ, I‘m accustomed to not seeing any rust.

One thing I plan on doing when receiving my order is a complete inspection, including the undercarriage.

A friend in the Northeast had a new diesel truck bought for him by his significant other, he was excited for a couple days until he looked underneath and noticed that the frame was not only rusty but had signs of an animal living under it, with scratches, claw marks and gravel between the body and frame. Turns out that the truck had been on the lot for a while and they had it parked in a field. Luckily, he channeled his frustration in the appropriate way and was able to secure a better truck along with a discount.

There’s a few products using sheep lanolin as a rust inhibitor and in the old days it was common practice to spray used motor oil under cars and trucks. Whatever anybody does though, don’t use any rubber undercoating, it’s the worst and makes things much worse.
 

uavmx

Well-known member
Joined
Oct 1, 2020
Messages
224
Reaction score
122
Location
Albuquerque
Vehicles
2014 Jeep Grand Cherokee
Had the truck two weeks in Tx. Powerboost platinum. I thought this was a bit too much rust for a 75k sticker priced truck.
20210131_121242.jpg
20210131_121242.jpg
20210131_121242.jpg
20210131_121242.jpg
20210131_121159.jpg
20210131_121127.jpg
20210131_121242.jpg


20210131_121220.jpg
Wow that seems ridiculous for any vehicle these days let alone $75k truck. Can anything be done by Ford?? Or are we all stuck dealing with this on our own?
 

Roger350

Well-known member
First Name
Roger
Joined
Aug 9, 2020
Messages
415
Reaction score
385
Location
Dallas
Vehicles
2011 Evo MR, 2015 Sonata Hybrid, 2007 Tahoe - Being Replaced by 2021 F-150
Occupation
Engineer
Adam I agree, that seems like pretty heavy rust for a truck in TX. Do you know what the build date was on your truck? I wonder if it was built very early and sat outside in Detroit for months before shipping? Still seems like a bunch of rust though. That would be hard to clean up laying on your back in the garage or driveway.
 
OP
OP

Daily22ssv

Well-known member
First Name
Adam
Joined
Dec 26, 2020
Messages
306
Reaction score
219
Location
Tx
Vehicles
21 F150 powerbost
Occupation
Tech
Wow that seems ridiculous for any vehicle these days let alone $75k truck. Can anything be done by Ford?? Or are we all stuck dealing with this on our own?
Yes it was submitted to ford yesterday service said could take a week or two for a response. I'm sure they will address it.
 
OP
OP

Daily22ssv

Well-known member
First Name
Adam
Joined
Dec 26, 2020
Messages
306
Reaction score
219
Location
Tx
Vehicles
21 F150 powerbost
Occupation
Tech
Adam I agree, that seems like pretty heavy rust for a truck in TX. Do you know what the build date was on your truck? I wonder if it was built very early and sat outside in Detroit for months before shipping? Still seems like a bunch of rust though. That would be hard to clean up laying on your back in the garage or driveway.
11/20 in Dearborn. It sat out there on ramp for quite a while on the inspection hold.
 

uavmx

Well-known member
Joined
Oct 1, 2020
Messages
224
Reaction score
122
Location
Albuquerque
Vehicles
2014 Jeep Grand Cherokee
Yes it was submitted to ford yesterday service said could take a week or two for a response. I'm sure they will address it.
Good to know they'll address it but just seems like an oversight to not have some sort of protection in those areas. Every truck will rust there eventually, so getting it addressed while under warranty is important
 

TruckGuy2020

Well-known member
First Name
Nick
Joined
Oct 13, 2020
Messages
98
Reaction score
83
Location
North Carolina
Vehicles
2021 F150
Occupation
Military
I have a similar issue, my truck took two weeks from build date to delivery, so it’s not like it was sitting outside for months. All I can think of is maybe the convoy transport was open and exposed and it was covered in salt water for a week. Here is what mine looks like brand new.

6D227D20-8F2A-49B8-BBC2-DF72BEA2C916.jpeg
 
Advertisement

 
Advertisement
Top