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brandyv73's 1968 Firebird

2019 June
of the Month

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rickmpontiac

Turbo 400 Vacuum Modulator Seal

Question

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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