1987 SWB Dually going down⬇️

[slotard]

Originally Posted by SCOTI

I purchased the same kit for my CC dually.

I did not like the amount of material required to be removed for the c-notches. I discussed the strength concern w/a former board member who was a structural engineer. He did some analysis which 'indicated' rear frame rail strength would be very compromised vs. un-cut or one cut w/a milder c-notch. Obviously people run them but the decrease in strength prompted me to do a step notch w/full frame rail height above the rear end.

I made changes to my other project as well because I based/built the c-notch on it after the one purchased for my dually. I ultimately sold off the flip kit but threw away the c-notches because I felt they weren't safe.

I can't say whether or not it's safe, but if anyone wants to draw up the dimensions of stock vs modified I'd be happy to calculate both stiffness and yield strength of each. I'd just say it's half as strong and 1/3 as stiff (or something, I'm making those numbers up for now) and you can decide whether or not you're willing to accept that.