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2020 GMC Sierra 1500 Gets Transmission Downgrade: Exclusive | GM Authority
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2020 GMC Sierra 1500 Drops Transmission Option - The News Wheel
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2020 GMC Sierra 1500 First Drive: Is the Diesel a Do or a Don't? | Edmunds
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2019-2020 GMC SIERRA 1500 TRANSMISSION CONTROL UNIT 5.3L | eBay
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Massive 2020 GMC Sierra 2500 HD gets AT4 off-road gear
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2020 GMC Sierra 1500 Gets Transmission Downgrade: Exclusive | GM Authority
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Check Out The 2020 GMC Sierra 2500HD's Undercarriage | GM Authority