The GMC Sierra HD is no longer available to order with the Gooseneck Hitch Package.
The Gooseneck Hitch Package previously offered for the GMC Sierra HD is tagged with RPO code SNO, and was offered as an LPO-level option, which means it was installed when the vehicle arrived at the dealer, rather than at the factory at the time of the vehicle’s production.
The GMC Sierra HD Gooseneck Hitch Package includes a gooseneck ball and a chain tie-down kit with a case. Pricing for kit was set at $295, with customers offered the option on all trim levels of the Sierra 2500HD and Sierra 3500HD.
When equipped on the base-level Sierra, Sierra SLE, Sierra SLT, and Sierra AT4 trims, the Gooseneck Hitch Package required the addition of the Gooseneck / 5th Wheel Prep Package, which is tagged with RPO code CMT, with pricing varying between $795 and $1,365.
When equipped on the GMC Sierra HD Denali, the Gooseneck Hitch Package required the Gooseneck / 5th Wheel Prep Package (RPO Z6A), which costs $545.
The GMC Sierra HD received a complete overhaul (redesign and re-engineering) for the 2020 model year, with the latest 2021 GMC Sierra HD introducing just a few minor changes and updates for the second production year of the fourth-generation vehicle.
Engine options include the naturally aspirated 6.6L V8 L8T gasoline unit, which is rated at 401 horsepower at 5,200 rpm and 464 pound-feet of torque at 4,000 rpm, and the 6.6L V8 L5P turbodiesel Duramax, which is rated at 445 horsepower at 2,800 rpm and 910 pound-feet of torque at 1,600 rpm. The gasoline engine connects to a six-speed automatic transmission, while the diesel engine connects to a 10-speed automatic transmission.
Under the skin, the GMC Sierra HD rides on a more capable version of the GM T1 platform. The 2021 GMC Sierra HD is assembled at the GM Flint Assembly facility in Michigan and the GM Fort Wayne facility in Indiana.