ATF consumption. My th400 is consuming alot of tranny fluid but there is nothing apparently really dripping off the belly of my 87 Suburban. It has gone through 3 quarts in the last couple weeks. Today I noticed some grey smoke from the exhaust that smells like cooking ATF. Is it possible that I'm vacuming ATF through the vacume connection thing on the side of the transmission, and if so, would it be fixable by replacing that part?