I know this might be a shot in the dark. Though does anyone know what frames correlate to what builds? I am looking at the frame specs for the 2021 and they have changed:

2021:
Type: Thickness / Section Modulus
LD: .087 - 4.726
HD: .094 - 5.14
HPP: .102 - 5.55
HPP: .11 - 5.96 (164.1 WB only)

2020:
Type: Thickness / Section Modulus
LD: .087 - 4.95
HD: .1 - 5.73
HPP: .11 - 6.28

My assumption is that HDPP would get the HPP, though I have seen some max tows get both HD and HPP in previous years. Don't know if this was due to parts on hand or if it is impacted by some options. I wonder if if normal Tow Package gets HD or HPP. Could people post their frame stickers for 2021 with the specs of their truck?

Edit: Did a lot of busy work:

 

I decided to edit the first post to upload a spreadsheet I just finished working on trying to decode the F-150. The Greens mean pretty much guaranteed to be that way based off restrictions in the build & price as well as different notes from different documents. I am pretty sure the details are accurate, but I could have made a typo some where, just like Ford does in a lot of their documentation. The Yes/No for the 2.7 Payload Package, Max Tow (MT), and PowerBoost (PB) that are in black are just best guess. I would like to cross reference this with what people have to see if a Max Tow or a PB have the thicker HPP frame, when not combined on the same build.

 

So I have a 2021 F150 XLT SCrew 5.5/145" Powerboost, and my Frame sticker is 4x4 HD HEV. I'm resurrecting this thread to see if someone with a Max Tow Powerboost can check their frame stick to see if it's an HPP HEV.

 

Somewhere there is a Ford issued frame thickness for the current generation.

 

Where is the sticker normally found. I have a 21PB equipped truck and can check but the one sticker I see along driver side frame rail does not seem to contain that info.

 

There are two stickers; one is behind some hoses, but the other one is slightly farther back and smaller has the frame code on it.

 

My Max Tow Powerboost Lariat, 145" is 4X4 HD HEV

 

This frame sticker is from a 2023 XL, HDPP MaxTow, 4x4 FX4, SuperCrew, 6.5-ft bed, 3.5L EcoBoost.
It's obviously not going to help answer any questions about PowerBoost frames, but it shows what to look for.



.

 

Found mine below the passenger side B-pillar. Says "4x4 HD HEV C/C Mini 145.0"" Frame build date 4/19/21.

 

FWIW this from the 2022 e-SourceBook