Eddie a Velvet Drive 10-13 is a very common transmission used behind Lehmans. The oil cooler is really the only way for water to get in there but you've already figured that out. There is no drain plug on those, the manual states to remove the lower hose to drain, but that's a pain and I find I can get at least as much out by pumping out of the fill port. Those really do hold over 4 qts but because of the "drop" reduction gear at the rear it's not possible to completely drain it. You'll be lucky to get 2 qts out. So after you replace the cooler I would strongly suggest you "change" the oil several times.
Ken
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