DT250a Posted September 6, 2012 Share Posted September 6, 2012 . AUTOMATIC TRANSMISSION VEHICLES ONLY I just wanted to post the Subaru part number for the Auto transmission vacuum diaphragm, aka vacuum modulator. This is the vac can that is on the passenger side of the trans and has a vac line running to the manifold. The following part numbers correspond to my 1987 GL-10 3AT non turbo, but also fit others. Vacuum Diaphragm - Subaru Part 31931AA000 $41.38 Alternate part: NAPA Part 1-5243 $34.23 OEM part recommended for longevity. Symptoms when bad: White smoke out exhaust. Could be thin, could be clouds of smoke that cover an entire intersection! ATF consumption. Diagnosis: Pull vac line off vac mod can. If fluid drips out or is present, it is faulty. I hope this helps someone save time. . Quote Link to comment Share on other sites More sharing options...
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