TH400 Gasket and Seal Kit 1965-1990 - Aftermarket

Overview

Aftermarket gasket and seal kit 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

Fluid leaks at pan, output shaft seal, axle seal, cooler line fittings; leaking pump seal. Used during rebuild or to address external leaks without full teardown.

Specifications

• Transmission: TH400
• Part Type: Gasket and Seal Kit
• Brand: Aftermarket
• 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.