Remove the doghouse (engine cover) and remove the heater duct. Then you can access both speakers through the doghouse.
The 2001 GMC Sierra 1500 dashboard speakers measure 4.5 inches in diameter. The front door speakers measure four inches by six inches. The rear speakers measure five inches by seven inches.
The 2002 GMC Sonoma typically comes with 6.5-inch speakers in the front doors and 4x6-inch speakers in the rear. Depending on the audio system option, there may also be additional speakers in the dashboard. It's important to check the specific configuration of your vehicle, as variations can occur based on trim levels and optional packages.
4x6 are the size of the door speakers on 2004 GMC Sierra. Standard cab
The 2001 GMC Sierra has 6 1/2 inch speakers in the front as well as in the rear.
They have 6.75" front and rear.
first you must remove the plastic casing from the rear speakers and remove the dashboard. then disconnect the old speaker wire from the old speakers and tie the new wire to the old wire. at the radio, pull the speaker wires one by one until the new wire reaches you. then splice the new speaker wire to both the radio and the speakers and replace the dash and covers
Remove speaker grill covers on dash to expose tweeters then remove door panels and you will se the rest of speakers
6 1/2" front and rear
unbolt the door panel for rear, or loosen clips on front doors. then pop off and there ya go
How can I take apart the dashboard of a 1995 gmc Yukon
For the 2001 GMC Sonoma, the front speakers are 4 inches by 6 or 6-3/4 inches. The dash speakers are 4 inches by 6 inches, and the rear speakers are 4 inches by 10 inches. The rear side panel speakers are 4 inches by 10 inches, and the front door speakers are 6-3/4 inches.
6 1/2 front doors and back