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all that matters is the amount of vac you are getting at the bottom to the modulator.it should be at least 15 at idle. the new modulator will come with a piece of vac line that has a 90degree bend in it that will take care of the difference between the old and the new..if you arent getting...

they are saying it right probably a broken modulator.a broken diaprham will make the trans fluid go up the vacume line and get burned by the engine giving you gray smoke. also it causes a vacume leak and will make the trans shift harder and later. due to higher modulator pressure as the diaphram...

oh no not a buick guy .i bet you parked the truck next to the buick and it caught a leak from the buick:lol: