Torque Converter 12in 2500 Stall TH350/TH400

The Torque Converter 12in 2500 Stall TH350/TH400 is a performance transmission component engineered for street and strip applications requiring controlled acceleration and improved launch characteristics. Built for classic hot rods, muscle cars, and modern restorations running GM's legendary TH350 or TH400 automatic transmissions, this converter bridges the gap between engine torque delivery and transmission input shaft speed. A 2500 RPM stall speed makes this converter ideal for upgraded engines, nitrous systems, or aggressive cam profiles where stock converters fail to hold adequate engine speed before the transmission engages.

The 12-inch diameter design balances efficient cruising with solid off-the-line performance—larger than economy converters but manageable for street driving without excessive heat generation. The 2500 stall rating means the converter allows engine RPM to climb to approximately 2500 before coupling with the transmission, loading the engine under load and delivering stronger initial acceleration than lower-stall units. Heavy-duty welded construction and precision-balanced internals ensure reliable performance across repeated heat cycles, whether on weekend cruise nights or consistent track duty. Weighing 23.5 lbs, the converter fits within OEM packaging while delivering measurable improvements in throttle response and launch consistency on vehicles with modified power plants.

This converter is best suited for builders upgrading carbureted or fuel-injected engines producing 350+ horsepower, or any application where OEM converter slip is insufficient for proper stall characteristics. Direct fitment for TH350 and TH400 equipped vehicles eliminates adapter complications and transmission case modifications. Installation requires standard transmission service—no special tools beyond a converter holding fixture. Compatibility extends across all year models using these transmission platforms, making it a versatile choice for vintage restoration projects and modern crate engine swaps alike.