4L80E 2200-2400 Stall Lockup Torque Converter 4.8L 5.7L 6.0L

This is a lockup torque converter for the GM 4L80E and 4L85E, rated at a 2200 to 2400 RPM stall speed. It fits the common truck and van applications running the 4.8L, 5.7L and 6.0L behind a 4L80E, and it keeps the electronic converter clutch so your TCM can still command lockup on the highway to keep fluid temps down.

The slightly raised stall over a bone-stock unit lets the engine come up onto the torque curve before the converter fully couples. That helps a heavier truck, a 33-inch tire setup, or a mild cam get moving without bogging, and it is a sensible pick for towing and for a stock-to-mild combo that still wants a lockup clutch for cruise. It is not a loose race converter, so street manners and part-throttle drivability stay reasonable.

Physically it is the standard 4L80E pattern: a 13.75 inch outside diameter, a 35-spline input hub, a six-pad flexplate mount, and an 11.5 inch bolt circle, so it drops into a factory 4L80E without adapters. The unit weighs about 49 pounds. As with any converter, prime it with fluid, seat it fully onto both pump lugs before you bolt the case up, and set converter-to-flexplate clearance before final torque.