The front wipers on a 2018 GMC Sierra 1500 typically use a 22-inch driver-side blade and a 20-inch passenger-side blade, with an 11-inch blade for the rear window. If you’re replacing blades, these lengths fit most models, but it’s always best to verify by checking your current blades or the owner's manual.
Front wiper blades: standard sizes
Before buying front wiper blades for the Sierra 1500, know that the driver’s side blade is longer to cover more windshield, while the passenger side uses a shorter blade. This pairing works for most 2018 Sierra 1500 configurations (Regular, Double, and Crew Cab) but variations can occur by trim or aftermarket replacements.
- Driver-side blade: 22 inches
- Passenger-side blade: 20 inches
In practice, these two sizes are the common front-end pairing for the 2018 Sierra 1500. If your current blades differ, measure them or consult the vehicle manual to confirm the exact lengths for your specific cab configuration.
Rear wiper blade: size to know
The rear window on the 2018 Sierra 1500 uses a single, smaller blade. The standard length is 11 inches, though some aftermarket options may be 12 inches depending on the blade design or regional variations. Always verify by measuring the blade you replace or by checking the owner’s manual.
- Rear blade: 11 inches
For most owners, the 11-inch rear blade is the correct fit. If you have an aftermarket rear blade or a different trim, double-check the measurement to ensure proper contact with the rear window.
How to verify and replace blades
If you want to confirm sizes or replace blades yourself, here are practical steps to follow. This guide applies to typical factory replacements and common aftermarket blades.
- Lift the wiper arm away from the windshield and locate the release mechanism on the blade connector.
- Depress the release tab or clip to detach the old blade from the wiper arm.
- Measure the blade length or compare the connector type (hook, pin, or side-lock) with the new blade to ensure compatibility.
- Attach the new blade by aligning the connector and snapping it into place, then gently lower the wiper arm back onto the windshield.
- Test the wipers at a light rain or spray to confirm full contact and proper operation.
Tip: When buying blades, consider weather conditions in your area and choose a reputable brand with good all-season performance. If you’re unsure about fit, many auto parts stores can confirm the correct sizes for your exact cab configuration.
Summary
For the 2018 GMC Sierra 1500, the typical front wipers are 22 inches on the driver's side and 20 inches on the passenger side, with an 11-inch blade for the rear window. Always verify with your current blades or the owner's manual, especially if you have a unique cab configuration or aftermarket replacements. Proper fit ensures clear visibility and safe driving in all weather.