Cracked and sagging floor

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Greasyfingers

Greasyfingers

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I'm preparing to build and install subframe connectors. While under my car today, I noticed the drivers side floor around the inner front seat stud is cracked (the one toward the back). The floor was sagging in that area also.

I jacked up the sagging area and hammered it back into shape. Still need to weld up the crack. Has anyone made supports from subframe connectors to where the seat mounts? Not sure the best way to get floor supported to keep it from sagging again.
 
There is typically a reinforcement patch on the inside floor on the bucket seat cars. But not always.
When they crack like that use a bigger washer and time to hit the gym. Lol!

you can see the two inbound plates on this car we did recently. The outer ones were not there.
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I put tabs on my subframe connectors to support seat. It was a couple years ago, think i just did the two outside seat bolts, as the one rear one was cracked. 1x2 rectangle,drilled fir seat bolt, then drilled lower side so socket will fit.
 
I replaced the carpets years ago and there definitely wasn't any of those reinforcements on the floor. I was just looking and the passenger side is starting to crack around the same hole. Looks like I'll have to fab up some for both sides. If the floors crack like an eggshell with my 175 lbs. boy I'm in trouble:D
 
Greasyfingers said:
I replaced the carpets years ago and there definitely wasn't any of those reinforcements on the floor. I was just looking and the passenger side is starting to crack around the same hole. Looks like I'll have to fab up some for both sides. If the floors crack like an eggshell with my 175 lbs. boy I'm in trouble:D
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Remember those floors are like 50 years old and have seen some use. Cracks in sheet metal happens. It’s what you do with them is what counts.
 
An old friend of mine was so big that he had to be weighed on a truck scale. He broke the bucket seat mounting in the same area. Sometimes there's a reason why these old cars are in the condition that they are.
 
My 66 is cracked and no reinforcements. Something I need to fix.
 
Try to weld up the cracks, and install the bucket seat reinforcement plates. I bought some from Classic industries, but I'm sure they would be easy enough to make yourself.
 
toolmanmike said:
My 66 is cracked and no reinforcements. Something I need to fix.
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Wait! What? Mike... your a Mod and you are driving around with cracked seat mounts. Your like a god around here. Lol! Time to step it up son. Get that fixed.
It’s all that horsepower you created.
 
Syleng1 said:
Wait! What? Mike... your a Mod and you are driving around with cracked seat mounts. Your like a god around here. Lol! Time to step it up son. Get that fixed.
It’s all that horsepower you created.
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It's my 235# in the drivers seat and power shifting second. Good thing for Hurst shifters. I don't do that any more though. I had the clutch pedal stick to the floor. Oops.
 
The bench seat cars come them little braces comin off the rockers on the bottom of the floor pan. So it stands to reason the buckets need somethin similar on the inside tracks. How close is "that area" in relation to the torsion bar cross member? Maybe you could come off that somehow for some extra strength.
 
Well the factory forgot to install the reinforcement on the rear bolt hole. It's on the front hole.

Made a template for my subframe connectors and the seat support strut.
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The assembly line installed the floor plugs from the bottom up. Should go from the interior down correct?
 
There is at least one example/thread with picture here of floor cracking at the perimeter of the factories reinforcement plate(s). So the plate didn't totally prevent sheet metal cracking.
Body plugs are typically installed from top down. I dont know that it makes any difference one way or the other. Could you step on the raised side hard enough to push it out? Maybe. That hasn't happened yet. Go ahead and flip them since you have the carpet out.
 
RustyRatRod said:
The bench seat cars come them little braces comin off the rockers on the bottom of the floor pan. So it stands to reason the buckets need somethin similar on the inside tracks. How close is "that area" in relation to the torsion bar cross member? Maybe you could come off that somehow for some extra strength.
Click to expand...
I think the front bolts on my 66 have a brace but not the rears. I don't know why.
 
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