TCI TH400 Racing Transmission Filter & Reusable Pan Gasket Kit 1966-1991 — High-Flow, Leak-Resistant

TCI 228500 is a purpose-built TH400 racing transmission filter and reusable pan gasket kit that improves fluid flow, captures contaminants, and replaces the factory pan seal for reliable maintenance.

This kit was developed for racers and performance enthusiasts running GM Turbo-Hydramatic 400 (TH400) transmissions in vehicles from 1966 through 1991. It pairs a high-flow racing transmission filter engineered for better circulation and particle control with a durable reusable pan gasket that resists leaks and repeated service cycles. The package is compact and lightweight, making it an efficient upgrade during routine transmission service or before track events.

How does this kit improve transmission fluid flow and filtration?

The racing filter is shaped and sized to reduce restriction while still trapping wear particles and debris that can damage clutch packs and valve bodies. Better flow helps maintain consistent hydraulic pressure under heavy loads, and the filter media is selected for racing duty where heat and shear are higher.

• High-flow design lowers hydraulic restriction compared with many OEM filters.
• Filtration media captures metallic particles and contaminants from the circuit.
• Optimized shape promotes even fluid distribution through the transmission.

What makes the pan gasket in this set different from standard replacement gaskets?

The included pan gasket is a reusable sealing solution designed to resist compression set and maintain a leak-free joint after multiple service cycles. It’s engineered for the TH400 pan interface, giving a precise fit that reduces the need for gasket sealants and simplifies reassembly.

• Reusable material resists permanent deformation during bolt torqueing.
• Vehicle-specific profile ensures correct alignment and sealing.
• Reduces dependency on messy RTV or single-use gaskets during rebuilds.

Is this kit suitable for track use and heavy-duty applications?

Yes — the filter and gasket were selected for performance environments where transmission temperatures and load cycles exceed typical street use. While not a complete transmission rebuild, this kit contributes to improved durability and serviceability under demanding conditions.

• Filter media chosen for higher shear and temperature tolerance.
• Gasket construction resists repeated removal and reinstallation.
• Lightweight package limits added weight and is easy to handle during pit stops or garage work.

How do I install the TCI 228500 kit and what should I check during service?

Installation is straightforward for anyone familiar with transmission pan removal: drain fluid, remove the pan, unbolt the factory filter, install the TCI racing filter and gasket, then refill with the correct fluid volume and type for your TH400. Always torque fasteners to manufacturer specs and inspect the pan and magnet for wear debris.

• Drain fluid and remove pan to access the factory filter.
• Swap in the TCI racing filter and fit the reusable gasket to the pan flange.
• Reinstall pan, torque bolts properly, and refill with the recommended fluid and quantity.

Who is this for: TCI 228500 is aimed at vintage GM owners, street-rod builders, and racers running TH400 transmissions from 1966–1991 who want a cost-effective performance upgrade. It’s suited for technicians and do-it-yourselfers that prioritize improved fluid flow, better particle control, and a reliable pan seal that can withstand repeated servicing. If you need a simple, performance-minded filter and a reusable gasket to support heavier duty operation and easier maintenance, this kit provides a compact, vehicle-specific solution.

Features:

• TCI Racing Transmission Filter TH400 P/N 228500
• Fit type: Vehicle Specific (TH400, 1966–1991)
• Category: automotive-automatic-transmission-filter-kits
• Item Package Weight: 1.5 pounds