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Where is the transmission vacuum modulator on a 90 Chevrolet Silverado?

On a 1990 Chevrolet Silverado, the transmission vacuum modulator is typically located on the passenger side of the transmission itself. It's a small, cylindrical device with a vacuum line connected to it. However, the exact location can vary slightly depending on the specific transmission (e.g., TH350, TH400, 700R4).

To be certain, you should:

1. Consult a repair manual: A Haynes or Chilton manual specific to your 1990 Silverado will have a diagram showing the exact location of the modulator.

2. Look closely at the transmission: Follow the vacuum lines originating from the intake manifold. They will lead to the modulator.

3. Use online resources: Search for "1990 Chevy Silverado [Your Transmission Type] vacuum modulator location" on sites like YouTube or forums dedicated to classic Chevy trucks. Pictures can be invaluable.

Remember to be careful when working around the transmission; it can be hot even after the vehicle has been off for a while.

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