Would you explain your thinking behind this? I have wondered about a partial box job. The factory did this somewhat starting in the IFS trucks.Going to box the frame where the leaf springs mount once the K5 tank makes me move the crossmember
Shut yer face warn hubs...
Shut yer face warn hubs...
Warn hu...??
He called me...
HEY!!!
Just because you actually wheel doesn't mean you can insult us nonwheelers. We have feelings you know.![]()

Ah, I can't think at the moment of how the original K5 and suburban has the crossmember in relation tobthr spring hanger. Not that you have to stick with what the factory did...Moving the factory cross member means no support directly behind the frame. I figured some reinforcement is necessary so the suspension doesn’t tweak the frame
No but I had pondered if you might snap some pictures of the last bit of the project frame. I’m sure there are some differences there, but never payed attentionAh, I can't think at the moment of how the original K5 and suburban has the crossmember in relation tobthr spring hanger. Not that you have to stick with what the factory did...
Does it even snow down there? And not that brown snow you have to power wash off the frameWarn hu...??
He called me...
HEY!!!
Just because you actually wheel doesn't mean you can insult us nonwheelers. We have feelings you know.![]()

I know what that was. I refuse to acknowledge snowflakes! Warn hub licker!It never snows here, it only gets cold (mid 30's) for about 5-6 weeks in January/ February.
Btw that's not snow, those are my feelings. You called me a [gasp] Warn hub, now I'm hurt. I need a hug and a safe place.![]()

Easy there SasquatchCalm down Orange spice!
Boxing helps. Adding crossmembers helps more, adding a cage helps more.
Your trying to reduce overall flex and boxing will help each rail and thereby help overall rigidity. Adding in crossmembers will help even more as now you are helping reduce the twist between the 2 rails.
Adding a frame based cage will do more than either. But I realize that is not always an option