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Choose your trim in My Garage to confirm exact fit.
Exact-fit parts for the 2018 GMC Sierra 3500 HD SLT.
Retrax
Part # 80463
$2199.99
Dee Zee
Part # DZ16611
$256.49
Roll-N-Lock
Part # CM221
$329.00
AMP Research
Part # 74815-01A
$329.99
Go Rhino
Part # D6410000T
$179.99
WeatherTech
Part # 37807
$198.95
Husky Liners
Part # 57891
$59.99
Westin
Part # 27-64755
$654.99
Undercover
Part # SC100D
$202.52
AMP Research
Part # 76400-01A
$219.99
Truxedo
Part # 1705211
$165.99
Body Armor 4x4
Part # GM-4500
$1299.99
Westin
Part # 23-3855
$235.74
WeatherTech
Part # 110036
$93.95
Westin
Part # 28-51025
$622.99
Go Rhino
Part # 680280C
$514.99
Dee Zee
Part # DZ16113
$513.42
Go Rhino
Part # 660080PS
$599.99
N-Fab
Part # GFC07CC-TX
$599.99
Putco
Part # 9751235
$297.31
This page groups parts listed for the 2018 GMC Sierra 3500 HD SLT. Some products fit every trim, while others depend on submodel, engine, drivetrain, or brake package. Use your trim in My Garage or the product page fitment check to confirm exact fit.
We offer a wide selection of exterior accessories parts for the 2018 GMC Sierra 3500 HD SLT. This page narrows the catalog to the year, make, and model; use your trim on product pages to confirm exact fit when a part only fits certain submodels.
We carry parts from trusted brands including Go Rhino, Westin, Putco, Dee Zee, and LUND, plus many more. Filter by brand to find your preferred manufacturer.
Most in-stock items ship within 1-2 business days. Shipping rates are calculated at checkout based on your location.
Warranty coverage varies by manufacturer but typically ranges from 1 year to lifetime. Each product page includes specific warranty information from the manufacturer.
