Rail on rail subframe end treatment.

[Ramdough]

All,

I was looking at rail on rail subframe end treatments and came across a bunch of conflicting information.

Fuso does it this way:

https://www.mitfuso.com/files/BDD-Fuso-2015-16-FE.FG.pdf

Mack Trucks does it this way:

https://www.macktrucks.com/-/media/files/body-builder/manuals/7-frame.pdf

Australian government calls it out this way:

https://www.nhvr.gov.au/files/201901-0631-vsb6-section-j-body-mounting.pdf

And my Haynes manual uses 1/3 of the height of the rail tapered for at least the the height of the rail back in length.

So, I am looking at the taper to cut in a rectangular tube and I planned to use the Australian method. My subframe will actually be on top of a subframe that exists on top of my main frame, so I still get quite a bit of load dispersal before the main frame sees anything. Also, I plan on having a HMWPE or similar layer between rails.

Thoughts?


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[Ramdough]

I am surprised …. no responses.


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[Victorian]

I would go with your trucks manufacturer recommendations. At the end it doesn't matter what regulations are in Australia if you are in the USA.

 

[Ramdough]

I would go with your trucks manufacturer recommendations. At the end it doesn't matter what regulations are in Australia if you are in the USA.

I would if I could…. They don’t have a builders’ guide.


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[Tell_me_more]

Hey what did you end up going with? Would you be able to share some photos of your sub frame? I am just being my build here.

Cheers!

 

[Ramdough]

Hey what did you end up going with? Would you be able to share some photos of your sub frame? I am just being my build here.

Cheers!

I did a mount system similar to an M1079.


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