GMC Sierra 3500 HD Transmission Filter - aFe - ProGuard - `17-`19. This listing is for the aFe POWER ProGuard OE replacement air filter designed for 2017–2019 GMC Sierra 3500 HD trucks with the V8 6.6L L5P diesel motor.

The ProGuard OE replacement uses deeply pleated, high-quality filter media to increase particle-holding capacity and help keep intake contaminants away from the engine. A bonded foam pre-filter layer captures larger debris before it reaches the primary media, extending service life in dusty or demanding driving conditions. This part replaces GM OEM number 84850016 and is sized to fit factory airbox locations without modification.

Features

• Deep-pleat filter media for improved dirt capacity
• Foam pre-filter layer to trap larger particles
• OE-style fitment for 2017–2019 GMC Sierra 3500 HD (6.6L L5P)
• Recommended service interval: every 12,000–15,000 miles

Ideal for enthusiasts who run their Sierra in work or off-road environments, the ProGuard OE replacement provides reliable protection while maintaining airflow close to OE levels. It’s a straightforward upgrade if you want a durable, serviceable filter that matches factory fitment.

If you have questions or need fitment help, give us a call: 512-982-9393 (TX) or 562-981-6800 (CA). We have two locations—Austin, Texas and the Los Angeles, California area—where we offer installation and customization services. If you’re thinking about purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov