TH400 Shift Kit

Overview

This is a shift correction and reprogramming kit for the GM, Chevrolet, GMC, Cadillac TH400 automatic transmission. Built to OEM specification and engineered as a direct-fit replacement for a professional-grade TH400 repair or rebuild. Every TH400 order ships fast and is backed by our support team.

What's Included

• recalibrated valve-body springs and valves
• checkballs and separator-plate components as applicable
• step-by-step installation instructions

Fitment

Fits GM, Chevrolet, GMC, Cadillac vehicles equipped with the TH400 automatic transmission. Please confirm your transmission model and year before ordering to ensure correct fitment.

Common Symptoms & When to Use

Consider this TH400 part when you experience:

• soft, mushy or delayed shifts
• slipping or shift flare between gears under load
• harsh or erratic shifts and shift-related codes
• clutch and band burnup on towing or high-power builds

Specifications

• Transmission: TH400

Quality & Service

In-stock parts ship fast; special-order items ship within 3 business days. Free shipping on orders over $70. Backed by Core Transmission Parts — your source for TH400 transmission parts.