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