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Pontiac of the Month

hdkeno's 1969 Firebird

2023 March
of the Month

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Turbo 400 Vacuum Modulator Seal

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I just replaced the vacuum modulator attempting to eliminate a hard shift at slow speeds and have a question about the o'ring seal around the tube that slides into the side of the transmission case. Does the o'ring just fit between the lip on the tube of the modulator and against the perimeter of the hole in the transmission case, or is it supposed to go into a recess in the side of the transmission case. I couldn't see anything like that, but it just seems like a poor design to have an o'ring between two flat surfaces. Thanks for any help or suggestions as always.

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