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The 1999 Monte Carlo has a 4T65E transmission that has no vacuum modulator, This transmission uses an EPC solenoid to control pressure, and commonly goes bad causing a harsh 1-2 upshift, pump whine and a check engine light with code P1811, max adapt.

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12y ago
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Q: How do you change the transvacumm modulator on a 1999 3.1 LS Monte Carlo?
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