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No, GM And Allison Did Not Break Up: Medium-Duty Trucks Use Allison Transmissions
Silverado and Sierra 4500HD, 5500HD, and 6500HD models will continue to use Allison six-speed commercial-grade automatic transmissions.
Silverado and Sierra 4500HD, 5500HD, and 6500HD models will continue to use Allison six-speed commercial-grade automatic transmissions.