Q&A !!! How to make a subframe for a Expedition truck. DIY step by step.

[@davidzimmer2694]

I'm a career draftsman. You are as close to an engineer as anyone I've worked with for 50 years. Trust me. LOL

[@oscaroverlander_MB1222AF]

Thank you very much !

[@fransdonners2746]

Dear Oscar, I totally agree with your statement for the springs and the force / function of them. As I constructed my subframe in 2022/2023 I followed the same philosophy. And as it is most times when you make things yourself, they are always heavier and stronger, compared with those of mass-production-lines.

[@oscaroverlander_MB1222AF]

Right on, thanks Frans.

[@gator701]

Very helpful - I have many builders opinions from Australia and it is good to compare opinions

[@oscaroverlander_MB1222AF]

Thanks a lot !

[@livingworkingoutsidebox]

Very helpful Thanks 💪👍

[@oscaroverlander_MB1222AF]

Glad to hear it!

[@F550-OVERLANDER]

How did you determine how many springs to use per side and how far to space them out between each other? Also is the rear portion for the subframe bolted to the truck frame? Thank you, great build and helpful information!

[@oscaroverlander_MB1222AF]

The spacing was dictated by where I could find enough space on the chassis frame and this on both sides of the frame. I have four springs each side and you want to place them more to the loose front while the back is bolted and doesn't lift much. Cheers

[@chrisdaniel1339]

What made you choose this type of sub-frame verses a rocker style with a center line pivot points?

[@oscaroverlander_MB1222AF]

Three important points for me, lower build up and the possibility to fabricate my self with the tools and space I have available and it suits the use case where we wanna go with this truck. ( no extreme off roading )

[@drmvh]

You made a hinge at the back? How did you do that please?

[@fransdonners2746]

The subframe is mounted fix to the chassis, with a connection at the most-rear end. There is a thick plate (10 or 12mm) welded to the subframe and tightly bolted (M12-M14) to the chassis. The wholes in this plate should be 1mm wider than the bolt diameter. This is to allow some movement between chassis and frame when the chassis is in torsion.

[@drmvh]

@@fransdonners2746 Thank you

[@oscaroverlander_MB1222AF]

Frans explained it pretty good thanks guys. For better understanding I recommend watching the original video. kzbin.info/www/bejne/d6DJhnmAmdWrbc0