It looks like bath tub silicone. If anyone has experience, let the rest of us poor cobra slobs and snobs in on the secret...a number of us have experienced said leaks recently on NEW trannys
.. my front edge inside the bellhousing totally gave out and spilled all but the last 1/2 quart into the bellhousing, where it remained until the shop pulled it. By all appearance and function the internals are still OK, but that's mostly because I stopped driving her when something did not "feel right" with the hydraulic clutch, a real manifestation of providence. This stuff is kinda cream/pink. Here's a few pics...
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