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What'd you expect this to be?
Hey Dave.. I came across this pic surfing thru the cleaning thread as I always enjoy reading your posts.. bit concerned if driven as shown..
You probably already know.. the floor panel is a shear panel, it is a structural component, thickness and material of the panel strength is necessary. The frame is like a ladder in a plan / top view, the left or right frame rail can now move forward or rearward in relation to each other. The floor panel helps prevent the frame rails from this racking stress. That loop tube design will not help prevent racking, it's merely another straight rung in the ladder. You may not have a problem immediately, but over time due to fatigue there will be, cracks at the other crossmember welds, etc..
Only thing I could suggest as a solution is to notch the floor panel around the loop angle that is fastened to the rail and them together, so the loop and the floor panel is one assembly that is bolted to the frame rails, or it may be fine not welding them together. I'm also thinking you already have a floor panel notched and just removed it for cleaning?
Mike
PS.. i.e. the past 998 / 999 recall is an example of frame racking related problems.. why they needed to add gussets on the horizontal shear plane.. more prone to similar cracking problems removing the floor panel..