General Motors has engineered several exceptionally robust transmissions throughout its history to handle high torque and heavy workloads. Legendary heavy-duty units like the classic Turbo-Hydramatic 400 (TH400), the robust Allison 1000 series utilized in heavy-duty diesel pickup applications, and modern heavy-duty 10-speed automatic transmissions are widely recognized as the strongest gearboxes ever integrated into General Motors vehicle platforms, capable of withstanding immense stress and massive towing capacities.