I thought of the possibility of a failed cooler, but the radiator had green coolant in it (propylene glycol based). Wouldn't the contaminant have been green? The coolant from the radiator didn't seem contaminated either when I drained it a few weeks ago. Would've made more sense to me, but it was definitely water clear. Thanks for the warning about the glue, and now I'll pressure test the radiator before I reuse it. I'm fairly certain I won't be sticking that tranny in another car now without addressing likely problems you brought up.

Edit, must confess I didn't taste it.

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1983 CD
1958 Studebaker Packard (being resuscitated)