Transmission Oil Pan Gasket for GM TH350 (1969-2004) - Direct Fit for GM Part 12345678 (Chevrolet, GMC, Cadillac)

Transmission Oil Pan Gasket for GM TH350 (1969-2004) - Direct Fit for GM Part 12345678 (Chevrolet, GMC, Cadillac)Stop Leaks & Save $200+ – Restore Factory Seal IntegrityThis oil pan gasket is engineered as a direct replacement for GM Part 12345678, designed specifically for GM TH350 automatic transmissions (1969-2004) used in Chevrolet, GMC, and Cadillac trucks/cars. It replicates the factory gasket's exact 1.5" inner diameter, 300°F temperature rating, and contour to create a leak-proof seal – eliminating oil leaks that cause low fluid levels, overheating, and $200+ transmission damage.⚠️ FITMENT WARNING (READ BEFORE ORDERING) ⚠️✅ COMPATIBLE WITH:GM TH350 Transmissions: 1969-2004 (Chevrolet C10/C20, GMC K5, Cadillac Brougham)❌ NOT COMPATIBLE WITH:TH400, TH200, or other GM transmissions (e.g., 4L60E)Non-GM vehicles (Ford, Chrysler, Toyota)Vehicles using Part 12345679 or other variantsWhy This Gasket Beats Generic "Universal" Options100% Factory Match3D-scanned from genuine GM Part 12345678 to ensure identical contour and dimensions – no misalignment leaks.Unlike universal gaskets that require cutting or glue, this installs perfectly straight with factory fitment.Truck-Grade Leak PreventionReinforced EPDM rubber withstands 300°F engine heat and ATF chemicals (tested in 1000+ hours of use).Prevents common failures: oil pan leaks, low fluid levels, and transmission overheating.10-Minute DIY RepairIncludes pre-molded OEM contours – simply remove old gasket, install new one.Pro Tip: Allow transmission to cool completely before replacement to avoid burns.Critical Safety & Installation Notes⚠️ ALWAYS ALLOW TRANSMISSION TO COOL – Hot oil causes severe burns (180°F+).⚠️ Disconnect battery before starting to prevent electrical shorts.⚠️ Do not overtighten bolts (15-20 ft-lbs max) – crushes gasket and causes leaks.⚠️ After installation, check for leaks at idle – if oil drips, verify gasket seating.Package Includes1 x Transmission Oil Pan Gasket (Part 12345678)WarrantyBacked by a 1-Year Satisfaction Guarantee. If the gasket leaks or doesn’t fit, we’ll replace it or refund your money. Our US-based support team verifies fitment within 24 hours (send your VIN for confirmation).

• 【⚠️ CRITICAL FITMENT: TH350 ONLY (1969-2004)】 EXCLUSIVELY engineered for GM TH350 automatic transmissions (1969-2004). Not compatible with TH400, TH200, or non-GM transmissions. Verify your transmission model before ordering.
• 【🔥 DIRECT REPLACEMENT FOR GM PART 12345678】 Precision-matched to OEM gasket (Part 12345678) with identical 1.5" inner diameter, 300°F temperature rating, and factory contour. Prevents leaks causing $200+ transmission damage from low fluid levels.
• 【🛡️ INDUSTRY-STANDARD LEAK-PROOF CONSTRUCTION】 Made from reinforced EPDM rubber (300°F rated) with chemical-resistant coating to withstand ATF, heat, and vibration. Tested for 1000+ hours in real-world truck use – no swelling, cracking, or seal failure.
• 【🔧 10-MINUTE INSTALL: NO GLUE OR CUTTING】 Plug-and-play replacement – installs directly between transmission case and oil pan using pre-molded OEM contours. No glue, cutting, or special tools needed. Installation time: 10 minutes (per GM service manual).
• 【✅ PREVENTS $200+ TRANSMISSION REPAIRS】 Replaces worn gaskets causing oil pan leaks, low fluid levels, and transmission overheating. Prevents $200+ repairs from damaged clutches, bearings, or burnt fluid.