Click to enlargeGM Vacuum Modulator

Turbo 350 vacuum modulator Turbo 400 vacuum modulator by B&M 20234. B&M's Turbo 350 and Turbo 400 vacuum modulator is fully adjustable, this allows you to tailor your shift points to within a range of 2-4 mph. Comes supplied pre-adjusted for normal shift points.

NOTE: If you engine has a big camshaft and your engine does not make adequate vacuum, you will not be able to make the stock or B&M modulator work properly, usually resulting in late, hard shifts.


Turbo 350 Turbo 400 Vacuum Modulator B&M 20234 20234$28.99
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