What size speakers are in a 2001 gmc sierra truck?

The speaker sizes in a 2001 GMC Sierra 1500 vary depending on the trim level and whether it's a regular cab, extended cab, or crew cab. There's no single answer. You'll need to check your truck's specific door and dash locations to determine the sizes.

To find out definitively:

* Visually inspect the speakers: Remove the speaker grills (usually just pops off) and measure the diameter of the speaker. This is the most reliable method.

* Consult a repair manual: A repair manual specific to your 2001 GMC Sierra 1500 will list the speaker sizes. You can find these online or at auto parts stores.

* Check online forums: Search online forums dedicated to GMC Sierras or car audio. Someone may have already documented the speaker sizes for your specific model.

Don't rely on generic information; the sizes can vary quite a bit even within the same year and model.