Speedometer Block Off Plug with O-Ring for TH350 TH400 Automatic Transmission 1968-1981, Fits GM Chevrolet Cadillac Buick Oldsmobile Pontiac GMC Vehicles

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· Prevents Transmission Oil Leaks - Effectively seals the unused mechanical speedometer port with a high-quality, oil-resistant O-ring. This prevents fluid from seeping out after removing the original speedometer cable, protecting your transmission's lubrication. · Durable & Corrosion Resistant - CNC machined from high-quality T6061 aircraft-grade aluminum alloy with an anti-oxidation treatment. This ensures excellent resistance to corrosion, high temperatures, rust, and deformation for long-lasting performance. · Wide Vehicle Compatibility - Designed to fit GMC, Chevrolet, Cadillac, Buick, Oldsmobile, and Pontiac vehicles with TH350/TH350C automatic transmissions from 1968-1981. · Easy, Direct Installation - Requires no welding or modification for installation. Simply replace the original factory connector. No special tools are needed, and the installation can be completed in just a few minutes. · Dual Protection Seal - This plug not only stops oil leaks but also effectively blocks dust, moisture, and other impurities from entering the transmission, helping to extend its service life and ensure cleaner operation.