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Where is the vacuum shift modulator on a 1989 Chevy blazer?

The vacuum modulator on a 1989 Chevy Blazer's automatic transmission is located on the driver's side of the transmission itself. It's a small, cylindrical device with vacuum lines connected to it. It's often near the transmission's side cover, but the exact position can vary slightly depending on the transmission type (TH700R4, etc.). You'll likely need to get under the vehicle to locate it clearly. Look for a vacuum line running from the intake manifold to the modulator.