2018 GMC Sierra 3500 HD Parts and Accessories
Select The Trim & Engine Of Your Vehicle Below
The catalog for a heavy duty pickup splits in ways that are not obvious from the outside, which is why the model year matters. One-ton heavy duty truck in single and dual rear wheel and chassis cab form.
The parts we ship most for the 2018 GMC Sierra 3500 HD are EGR coolers, front hub assemblies, leaf springs and shackles, steering linkage and drag links and brake rotors and calipers. Every part listed here is a genuine GM component with the factory part number, not an aftermarket reproduction. On a heavy duty pickup these are the components that carry load and heat, and they are where an aftermarket substitute costs you the job twice.
Fitment questions account for roughly a quarter of the OEM orders we handle, and almost all of them trace back to the same cause: one vehicle, several nearly identical parts, one correct answer. The VIN resolves it every time.
For 2018 the underlying design was carried over, so the parts that split are the ones tied to options, trim and build date rather than platform. Heavy duty trucks split on cab and chassis configuration, single versus dual rear wheels, and gas versus diesel, and the catalog will often show several options for the same nominal part.
Send us your VIN before you order and our parts specialists will confirm the exact part number for your vehicle. Orders placed by 3pm Central usually ship the same business day from our Dallas warehouse, which keeps transit times short across most of the country. Cross-shopping a related truck? The 2018 GMC Sierra 1500 is the closest thing in the lineup that year.