How bent is this frame?

[dracko]

Been working on my ‘64 swb fleetside for a while now. Recently had some buddies help install the new repop bed. It lined up good, but noticed quick that the rear drivers side frame rail is bent down about 1/2” lower than the PS rail.

Tonight I bolted up the cross rails that the wood sits on, with new rubber pads under them, and ran a string line across the top of the rails to the rear cross brace that the wood sits on. This brace is not on pads and shouldn’t be based on the LMC diagram.?

I was pretty surprised to see that when just touching the cross braces, the string is about 3/8” high of the rearest brace on the PS and prob 9/16” on the DS.

Wondering if i’m missing something or if it’s all assembled properly and actually is that bent from years of abuse. Thanks in advance for any insight.

[The Rocknrod]

I dont think using the bed cross sills will tell you if the frame is bent.
Once you get the body off, I built and used something like this pic shows, you can cross measure the chassis to ensure squareness. Be advised I wouldnt think 1/16" or so difference will be outrageous for these trucks. In fact someone with more knowledge and history than I can elaborate I'm sure.

[dracko]

I should also mention that I did take the frame into an autobody shop to have the low DS rail brought up to match the PS.

The checked it for square and it is. But they failed to bring the rail high enough, that’s why I was out checking it over.

They also don’t have any specs on a 1964 frame, so they’re shooting for a symmetrical and square frame. That’s why I’m asking on here to get insight from folks that have been in this spot and assembled their bed and found all the rails to be inline or not?

To me, it seems like maybe the truck had a overloaded trailer that pulled the rear down after the bumpstops on both sides, but moreso on the drivers side.

[The Rocknrod]

I see what you mean now. Well you can use shim to level it.

[ryanv70c10]

Does the rear panel get mounted right on the frame, metal to metal or does it get a rubber pad as well? That would make up some of your distance.

[dracko]

Originally Posted by ryanv70c10

Does the rear panel get mounted right on the frame, metal to metal or does it get a rubber pad as well? That would make up some of your distance.

That’s also my question. I checked the LMC parts diagram and it shows rubber pads under all the cross rails except the end one. So I think it’s setup correctly.

I did attempt to put a pad under the rear rail but it’s not possible to line up the holes.

[JJ660]

The Mar-K "Bed Mounting Information" shows a rubber pad between the bed sill and frame. Here the link to their Tips & Tricks page: http://www.mar-k.com/index.php?p=tips-and-tricks

[TopFuel1966]

After you have placed the bed on the frame and squared it, I think you'll find that your rear crossmember will need to be raised and shimmed between the mounting tabs and the frame accordingly so that the gaps on both sides between the back of the cab and the front of the bed are even from top to bottom and what you are depicting in the photos will not longer be a concern.
That was my experience anyway.

[dracko]

Well the frame shop is going to take it back for some more tweaking.

Just want to confirm that the rear brace where the wood sits should be level with the other cross sills? If someone has a relatively unmolested bed I’d appreciate it if you could check to see if there is a pad between the frame and cross sill.
I plan to get them to run a string line and bring the end frame horns up to the line.