Body/Box Alignment

[wiscomick]

Truck is a 97 C2500 6 Lug. Check out the pic below. Bed is firmly bolted to the frame. Body mounts aren't sagging, as I replaced the cab mounts and repaired the rusty cab mount brackets over the winter. Any rusted bed crossmembers were repaired last year.

The body lines now match up, but the 'planes' of the lines between the box and cab are still not straight. Truck still has a very noticeable 'dip' where the cab and box meet. The gap is tighter between the cab and the box at the top than it is at the bottom.

Any ideas here? Do these frames sag over time? I've seen other trucks that were worse, and others that were better, so I can't really say what the issue is here, but it drives me nuts and I can't see a way to repair it.

Thoughts?

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[PlayingWithTBI]

Shims?

 

[wiscomick]

If I'd shim it level I'd have to shim basically every mounting point except the radiator support and the rearmost bed crossmember. Doesn't seem like the greatest idea. Idk. Has me stumped.

 

[HotrodZ06]

You could try to use a staight edge or maybe a level on the frame and see if it is sagged.

 

[wiscomick]

I'm sure there's some sort of way to measure if it is indeed bent or sagged, but I think that would involve more tools or knowledge than a level. Not sure man.

 

[whitewheels]

ot...but thats a really nice truck you got there [emoji106][emoji41]

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[Erik the Awful]

I'd double check the back end and make sure something isn't shimming it up.

 

[David89gmc]

The "Body Builder's Instructions" pdf is on this site as a download. All the frame and body specs are there. Sorry I don't have the link, but look around a bit and you'll find it.