TH400 Internal Wiring Harness 1965-1990 - Aftermarket

Overview

Aftermarket internal wiring harness 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 intermittent solenoid codes, transmission shifting erratically, fluid contamination in wiring connector. Internal harness failures cause shift problems that mimic solenoid failure but the harness is the actual root cause.

Specifications

• Transmission: TH400
• Part Type: Internal Wiring Harness
• 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.