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B&M's Vacuum Modulator is fully adjustable, this allows you to tailor your shift points to within a range of 2-4 mph. Comes supplied preadjusted for normal shift points. Note: If you have 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. - For GM TH350 & TH400
- Fully adjustable - tailor your shift points within 2-4 mph
- Comes preadjusted for normal shift points
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