1991 Pontiac Bonneville - losing tranny fluid and gaining oil

im losing tranny fluid and gaining oil

And if you keep driving that way you will need a new engine at the very least .

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Sounds like a bad vacuum modulator and worn rings/

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Remove the vacuum hose from the vacuum modulator.

If transmission fluid leaks out of this connection, transmission fluid is being sucked out of the transmission and into the engine.

Here’s how to replace the transmission vacuum modulator.

Tester

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