This heavy-duty GM 4L80E 2WD automatic transmission comes complete with a matched torque converter and is ready for bolt-in installation. Evolved from the legendary TH400, the electronically controlled 4-speed overdrive unit features gear ratios of 2.48, 1.48, 1.00, and 0.75:1, delivering strong launch power with efficient highway cruising.
Factory-rated for up to 440 lb-ft of engine input torque and 885 lb-ft of gearbox output torque, a stock 4L80E reliably handles 400–500 hp. With common upgrades it easily supports 700–1,000+ hp and comparable torque. Exceptional durability stems from its robust aluminum case, 32-spline output shaft, and heavy-duty internals—originally designed for vehicles up to 8,000–18,000 lbs GVWR and 22,000 lbs towing.
Ideal for high-power project cars and trucks including classic Camaros, Chevelles, Novas, Corvettes, Squarebody and GMT400 trucks, LS swaps, muscle cars, and hot rods seeking TH400 strength plus modern overdrive.
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