I modified the transmission pan and due to the heat from the welding I had trouble getting it back in line no matter how hard I pounded it. The two smaller pads failed - they looked dry and tight when I first installed them, but after 1 or 2 heat/cool cycles they were both leaking like waterfalls. It's not as thick as I expected, but the metal core resists extrusion well, and the embedded silicone that also lines the screw holes is a nice touch (and probably helps a lot too).
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