HOW TO: Crossmember sectioning ...

[SCOTI]

The X-member on my dually is notched 1.5" (89 Square body). The lower a-arms are PB 1" forward units but I originally had the modified OE lowers moved forward .750".

My set-up did require the small notch to the upper driver a-arm as mentioned. MMW uppers & later model OE uppers also had too large of an OD @ the bushing area & would not have cleared (I still have the MMW arms sitting in a box on the shelf three years later ).

When I'm air'd out, I can slip a slim piece of cardboard between the shaft/notch (like a spiral notebook cover).

[crakarjax]

Originally Posted by SCOTI

The X-member on my dually is notched 1.5" (89 Square body). The lower a-arms are PB 1" forward units but I originally had the modified OE lowers moved forward .750".

My set-up did require the small notch to the upper driver a-arm as mentioned. MMW uppers & later model OE uppers also had too large of an OD @ the bushing area & would not have cleared (I still have the MMW arms sitting in a box on the shelf three years later ).

When I'm air'd out, I can slip a slim piece of cardboard between the shaft/notch (like a spiral notebook cover).

Out of curiosity why did you ditch the factory lowers?

[SCOTI]

Originally Posted by crakarjax

Out of curiosity why did you ditch the factory lowers?

When I cupped the arms, I allowed for ~1/2" of clearance on my mock-up bag @ 25psi. Installed, the weight of the BBC plus those heavy hubs expanded the bad more than I liked (my clearance was about the thickness of a yardstick). I felt once the suspension started moving around, the bag would likely make contact.

I opted for Porterbuilt arms as they would swap right in place, had the forward placement option, & already had a tab for a sway bar (I still had to figure that out for the modified factory lowers as the original mounting position was no longer an option).

[rudyyloverboiii]

I too tried this and failed. Now i have to make my own motor mounts for my 292

nevertheless, it is an awesome write up

[tinydb84]

Since the other pics went down here is one that I did from a long time ago.
Laying out the lines and welding the braces.

Cut and cut and cut



Rough idea

Didn't get any of the pics of me welding it up or making the filler plates

Hope it helps someone!

[0ldSoul]

Thank you for the pictures, very helpful.

[SkinnyG]

Nice work!

I did a video of mine, sectioned 2" because I went rack & pinion as well. Starts at about 4min:

'61 C10 Apache - Part 7: Frame Modifications -...

[SCOTI]

Originally Posted by SkinnyG

Nice work!

I did a video of mine, sectioned 2" because I went rack & pinion as well. Starts at about 4min:

Well done video/commentary.

[smbrouss70]

I saved a pdf of a How-To off of Capt Kaos' website about 15 years ago, it should help anyone wanting to do this modification.

https://www.dropbox.com/s/v3kmtg5n71...ember.pdf?dl=1