4-Point Pivoting Subframe Design

[IdaSHO]

Thanks, I'll give it a read.

its worth a read. And why it isnt pinned (if it isnt) by now is a mystery.

And let me know if you still have questions. Ive hand built a couple of 3-point torsion free pivoting flatbeds.
The latest being the one we are currently running under our custom camper.

Idacamper Custom Flatbed

Ive had quite a few comments and requests for more info on this setup. It is a 10' bed with 8" flat, 2' cross body box. Chassis of the truck (2011 Superduty) was extended 24" Bed rides on a 3-point pivot torsion free subframe Complete with integrated self aligning mounts (for camper) and slide...

forum.expeditionportal.com

 

[SkiFreak]

I still can't see it.

Looks like you will need to break out the Lego.

 

[shortbus4x4]

I'm not doing a 3 or 4-point. I'm doing a spring-mounted setup on my 2024 Chevy 4500 LCF (NPR-HD).

Just something I'm curious about.

Do you have the upfitters guide from Chevy/Isuzu for it? If not get it. Read up on body mounting in it.

 

[Sixinarow]

Looks like you will need to break out the Lego.

Whoa, it just came to me, lol. They allow the subframe to twist. I was under the impression the subframe wouldn't twist at all.

 

[rruff]

Whoa, it just came to me, lol. They allow the subframe to twist. I was under the impression the subframe wouldn't twist at all.

No, the subframe doesn't twist, but it does tilt. The chassis frame twists.

4 point just means your fore-aft tilting pivots (nearly fixed, not much tilting at all) are in the middle (spaced wide) and the side to side tilting pivots are front and back, and in the centerline. The middle of the subframe will match the tilt of the chassis at the middle points, while the forward pivot will tilt less relative to the chassis and the rear pivot more.

Maybe the end of this video will make it more obvious.

 

[rruff]

I'm not doing a 3 or 4-point. I'm doing a spring-mounted setup on my 2024 Chevy 4500 LCF (NPR-HD).

Which end is fixed, and are you doing a pass-through?