OK- so the 85 MY has a vacuum line coming off it which my 84 MY does not. any ideas on this one? is it related to the EGR? or the tranny? i wonder about using an earlier MY Turbo.

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.