Red Stripe ADJUSTABLE MODULATOR for GM CHEVY TH250, TH250C, TH300, TH350, TH350C, TH400, TH425, 3L80, applications 1965 and up. INCLUDES: (1) UPDATED ADJUSTABLE RED STRIPE VACUUM MODULATOR, (1) MODULATOR O'RING, (1) MODULATOR HOSE ELBOW. Installation instructions included!