I have a leaking C-4 Trans. I bought a TCI cast pan and the cork gasket went so flat the hex screws were loose. I bought this pad (very expensive) but worth the money. The gasket is very thick and has a metal element inside the gasket. It took about half an hour to boot up. The gasket actually pushes out of the pan, maybe 1/16 or 1/8 inch when I'm done. NO MORE LEAKS! You'll need something to hold the gasket in place while you're trying to attach it to the trans. I used a Permagasket product but 3M All Purpose Finishing Adhesive would have worked better. I used a bottle jack to hold the heavy aluminum pan in place.
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