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The idea of using 100% silicone chaulk, to seal the trans tunnel, created a terrific seal between tunnel and Floor. I squeegied it smooth with a body putty applicator, it looked good and sealed perfectly. AS you know I had to remove it a few days later because I had forgotten to change out my U-joints. The silicone seal came away from the surfaces easily and came away almost as a one piece rope. This is all good. The downside is that on areas of floor/metal that I had refinished and repainted-it stuck alittle too well. I had to scrape it off and in doing that it ruined the paint. Another negative is that it is a challenge to get it chaulked-in smoothly because of the contoursions with the chaulk gun especially around the firewall. But once in it does seal. And set-up like rubber. If my car was restored and the floor flange smooth and even and painted I would diffinately take the trouble to affix a proper seal to the fibreglass tunnel. but if your car is unrestored with uneven and rusted floor flange, then the 100% silicone rubber chaulk does a very good job. I guess another condideration even with a restored car is how often do you intend to take the tunnel out. Buy the best quality you can find, the kind that says 'will not skrink'. /ubbthreads/images/graemlins/cheers.gif