Street Racer Lock-Up Coverter GM LS 4L80E

The Street Racer Lock-Up Converter GM LS 4L80E by FTI Performance is engineered for LS-powered vehicles running the legendary 4L80E transmission that demand maximum torque multiplication and responsiveness off the line. Built for street racers and performance enthusiasts who've invested heavily in LS engine builds, this torque converter directly addresses the demand for tight coupling, reduced slippage, and lightning-quick engagement under hard acceleration. Whether you're launching from a dig or merging on the highway with authority, a performance lock-up converter transforms how your transmission communicates with the engine, delivering the mechanical connection serious builders expect.

FTI Performance's Street Racer design features optimized stator geometry and lock-up characteristics that minimize converter slip during heavy throttle application, translating more engine torque directly to the transmission input shaft without the parasitic heat loss of a slipping coupling. The converter's internals are precision-balanced to handle the elevated power outputs common in boosted and naturally aspirated LS builds, while the lock-up clutch engagement is calibrated to occur smoothly and hold positively under load. This tight mechanical connection improves efficiency, reduces fluid heating, and sharpens throttle response—critical advantages when every tenth of a second counts and thermal management matters on extended passes.

This converter is purpose-built for LS-swapped street cars, bracket racers, and weekend warriors piloting vehicles with 4L80E transmissions who refuse to leave power on the table. Installation requires dropping the transmission pan and removing the original converter—a straightforward procedure for any shop or experienced DIY builder familiar with 4L80E service. Compatibility is limited to GM LS engines paired with 4L80E automatics; verify your engine family and transmission before ordering. Weighing 37.02 lbs and measuring 13 x 10 x 13 inches, it ships ready to bolt in and delivers immediate improvements in launch feel, engagement consistency, and overall drivability for serious street performance applications.