The Sierra 1500 and Silverado share a platform but have slightly different interior panels. SubCab is built to Sierra tolerances — not just a Silverado box with a different label.
Configure Your Sierra 1500 →Not sure which config? Read the GMC Sierra 1500 buyer guide →
Every config below is guaranteed to fit your GMC Sierra 1500. Pick your cab, pick your sub.
Each enclosure is modeled to the exact under-seat dimensions of the GMC Sierra 1500. It fits because it was designed to fit — not because someone said "close enough."
Different cab types have different internal volumes. SubCab accounts for that — acoustic tuning is cab-specific, not just a generic ported or sealed box.
Flip up the rear seat, slide it in, wire it up. No drilling, no fabrication, no cutting trim panels. If you need a YouTube tutorial to install it, we designed it wrong.
SubCab also fits:
Pick your cab type, choose your sub setup, and order. Ships in 10–14 days.
Configure Your Sierra 1500 →