Molten plastic lining? That's strange. I did my own fluid swap, and there's no plastic lining on the drain bolt itself. The bolt is steel, and there's washer. Are you referring to the washer? The washer is aluminum though, not plastic. Either way, it sounds like there was some sort of sludge stuck to the bolt, which definitely is not good.

it could be sludge....hmmmm. there were 2 bolts, the one in the pick has something black and stuck to it:(

we'll seen soon if it's made a difference.

Yes, there are two bolts. There's a drain bolt and hole, and a separate bolt/hole for filling. Which pic are you referring to? This one?

http://i767.photobucket.com/albums/x...5/L1010941.jpg

That's the drain hole, and all I see is a little residual fluid dripping out.

Here is the exploded view of the diff from the service manual, in case anyone is curious.

http://i618.photobucket.com/albums/t...09-53735PM.jpg

hmm, methinks the OP is not one speaking from experience.

yeah, the drain plug was the one with the black sludge on it....

I didn't personally replace the fluids but I was there with them.