Transmission Oil Pan Gasket with Steel Core for GM Turbo 400 (TH400), Compatible with Moroso 93103, Upgraded Rubber & Steel Shim Design

Steel-Reinforced Oil Pan Gasket for GM Turbo 400 (TH400) TransmissionThis is a replacement oil pan gasket specifically engineered for the GM Turbo Hydra-Matic 400 (TH400) automatic transmission. It incorporates a steel core within a durable rubber compound, designed to offer an improved sealing solution compared to some factory-style gaskets.Product Specifications & CompatibilityTransmission Application: GM Turbo 400 (TH400).Replaces/Compatible With: Moroso 93100, 93100; OEM-style gaskets for TH400.Material Construction: Vulcanized rubber (70 Durometer) with an internal 0.8mm galvanized steel shim.Thickness: 3/16 inch.Vehicle Compatibility: This gasket fits the TH400 transmission found in many 1984-1991 GM vehicles, including:Chevrolet/GMC Pickups & SUVs: C/K/R/V1500, 2500, 3500 series (e.g., Silverado, Sierra, Suburban, Blazer, Jimmy).GM Vans: G/P series vans.Cadillac: Fleetwood, Brougham.Critical Note: Compatibility depends on your vehicle having a TH400 transmission and a smooth, flat oil pan sealing surface. Always verify your transmission model and pan condition.Design & FeaturesSteel Core Advantage: The encapsulated steel shim adds rigidity to prevent the gasket from distorting under torque, which is designed to promote even clamping pressure and reduce the risk of leaks.No Sealant Required: The manufacturer designs this gasket to be installed dry on proper surfaces. The combination of material and rigidity aims to create an effective seal without RTV or other sealants.Installation Aid: The steel core helps the gasket hold its shape, making alignment with the pan and transmission housing bolt holes more straightforward.Installation Instructions & PrecautionsSurface Preparation (MOST IMPORTANT): This gasket is designed for smooth, flat surfaces only. Thoroughly clean both the transmission pan flange and the transmission housing sealing surface. Remove all old gasket material, oil, and debris. Ensure both surfaces are perfectly flat; repair or replace any dented or warped pans.Dry Fit: Place the gasket on the pan to verify alignment of all bolt holes.Installation: Carefully position the gasket on the pan or transmission housing. Install the pan and begin tightening bolts by hand. Follow the manufacturer’s recommended torque sequence and specification, typically working in a criss-cross pattern from the center outward to ensure even compression.Final Check: Refill the transmission with the correct type and amount of fluid. Start the engine, let it reach operating temperature, and carefully check for leaks around the entire pan perimeter.DisclaimerThis gasket is sold as a replacement part. Proper installation is critical and requires clean, undamaged, flat sealing surfaces. The installer is solely responsible for verifying correct application for their specific transmission model, ensuring proper surface preparation and installation technique. The seller is not liable for leaks or damage resulting from installation on improper surfaces, incorrect installation, or use with a damaged transmission pan.

• Upgraded Steel-Reinforced Design – Features a 0.8mm galvanized steel shim vulcanized inside high-durometer rubber, creating a rigid, 3/16" thick gasket designed to resist warping and provide a consistent seal
• Specific Fit for GM TH400 Transmission – A direct replacement gasket for the GM Turbo Hydra-Matic 400 (TH400) transmission. Also compatible with aftermarket Moroso pans using gasket numbers 93100 and 93103
• Wide Vehicle Compatibility – Designed for 1984-1991 GM trucks, vans, and SUVs equipped with the TH400 transmission, including Chevrolet/GMC C/K/R/V series pickups, Suburbans, Blazers, and Cadillac Fleetwood/Brougham
• Designed for Easier Installation – The internal steel core helps the gasket maintain shape and align with bolt holes, and it is intended for use on smooth, flat sealing surfaces without requiring liquid sealant
• Durable Replacement Solution – Constructed as a long-lasting alternative to traditional cork or basic rubber gaskets, aiming to address leaks from a worn or compressed original gasket.