TCI 280001 Vacuum Modulator - Adjustable - Sold Individually

Compatible with vehicles equipped with a 1963-1973 Powerglide automatic transmission

PART# TCI280001

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The vacuum modulator is a vital component of automatic transmissions. It tells the transmission what kind of load is being put on it, allowing the transmission to react with the proper line pressures and shift points. Over time, modulators can develop leaks, suffer ruptured diaphragms, become bent, etc. Not only can this cause annoying drivability issues, it can lead to premature transmission failure.

TCI® comes to the rescue with this line of adjustable modulators. Renew performance, and gain the ability to slightly raise/lower part throttle shift points and line pressures. Simply adjust the screw inside the vacuum nipple for more or less diaphragm pre-load.


  • Allows the transmission to react with the proper line pressures and shift points
  • Allows user to fine-tune your shift points and shift feel by simple screw adjustment located inside the vacuum nipple
  • Sold individually

Product Attributes

Brand TCI
Manufacturer Part Number280001
Product TypeAutomatic Transmission Modulators
QuantitySold Individually
Part NumberTCI280001

Tech Resources

NOTE:Replaces factory vacuum modulator.
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    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.