This Red Stripe Vacuum Modulator for Turbo 350 & Turbo 400 transmissions is fully adjustable, allowing 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 this modulator work properly usually resulting in late, hard shifts.
