TH400 Valve Body 1965-1990 551909 OEM

Overview

Aftermarket valve body for TH400 automatic transmissions, 1965-1990 model years. Direct-fit replacement built to OEM specifications. Trusted in shops nationwide for TH400 rebuilds and repairs.

Common Symptoms This Part Solves

Multiple shift solenoid codes, harsh or no shifts, stuck in gear, transmission acting erratic. A failed valve body controls fluid routing for every shift; replacement is often required after solenoid failures or contamination.

Specifications

• Transmission: TH400
• Part Type: Valve Body
• Brand: Aftermarket
• Part Number: 551909
• Year Range: 1965-1990
• Quality Level: Premium Aftermarket

Fitment

Fits GM, Chevrolet, GMC, Cadillac vehicles equipped with the TH400 automatic transmission, 1965-1990 model years. Cross-check your transmission ID tag and existing part number before ordering. Contact us for fitment verification on borderline year-model combinations.

Quality & Service

Free shipping on orders over $99. Same-day shipping on in-stock parts. All parts are sourced through verified suppliers and inspected before fulfillment. Questions about fitment or installation? Contact our team — we know TH400 transmissions inside and out.