What size speakers are in a 2004 GMC Sierra extended cab?

In a typical 2004 GMC Sierra extended cab, the front doors use 6.5-inch speakers and the rear doors use 4x6-inch speakers.

The Sierra shares its interior layout with the Silverado of the period, and the extended-cab configuration influences rear-door speaker sizing. Individual trucks with different trims or aftermarket replacements can differ, so it’s wise to confirm before buying replacements.

Standard sizes by location

These are the sizes you are most likely to encounter in factory configuration.

• Front doors: 6.5-inch (165 mm) two-way speakers


• Rear doors (extended cab): 4x6-inch (102 x 152 mm) two-way speakers

Most Sierra extended cab models use this setup, though exact configurations can vary by trim or prior upgrades.

Variations and aftermarket notes

Because audio packages vary by trim and previous owner choices, the exact fit can differ. If you are upgrading, measure the openings or consult OEM documentation. Common aftermarket practice is to replace with 6.5-inch front speakers and 4x6-inch rear speakers, with mounting adapters as needed. Some trucks may also have additional small tweeter components in the dash or A-pillars depending on option packages.

How to verify in your specific truck

Follow these steps to confirm the correct sizes for your vehicle before purchasing replacements.

• Remove a door panel to read the size stamped on the speaker magnet or on the mounting frame.


• Check the vehicle's service manual or a trusted parts database for the exact OEM specification for your VIN or trim level.

Verification helps you avoid ordering incompatible sizes or adapters.

Summary: For most 2004 GMC Sierra extended cab trucks, expect 6.5-inch front speakers and 4x6-inch rear speakers, with possible variations by trim or aftermarket changes. Always verify the exact size on your specific vehicle before purchasing replacements.

What size speakers are in a GMC Sierra?

6x9" Front & 6.5" Rear Door Speakers for 2014-2023 GM Silverado & Sierra 1500.

What size speakers are in the 2002 GMC Sierra 1500 extended cab?

Stock speakers for the front of the Silverado/Sierra are 6-1/2", a common size with great aftermarket support. You won't have trouble finding a speaker to fit any musical taste or budget.

What is the bad year for the GMC Sierra 1500?

Years to avoid for the GMC Sierra 1500 include 2014-2015 due to numerous electrical and transmission issues, the 2007-2010 period for problems with the Active Fuel Management (AFM) system, and specific recent years like 2020-2022, which had recalls related to 10-speed transmissions and 6.2L V8 engines. Other problematic years to be aware of are 2016-2018, which saw complaints about brake, engine, and transmission problems.
 
This video explains why you should avoid certain GMC Sierra 1500 models: 59sBig Truck Lovers YouTube · Aug 23, 2025
2014-2015 

• Issues: Widespread electrical problems, including glitches with the new infotainment system, dashboard gauges, and the transfer case. Some models had engine knock and failing headlights.
• Other concerns: Some 2014 models were recalled for a fire risk. 

2007-2010

• Issues: The early version of GM's Active Fuel Management (AFM) system in models with the 5.3L V8 engine is known for causing issues like oil consumption and engine problems. 

2016-2018

• Issues: This period saw a range of complaints, including issues with the braking system (2016), engine problems and stalling (2017), and continued technology and transmission complaints (2018). 

2020-2022

• Issues: These years are affected by recalls and service bulletins for the 10-speed transmission, particularly related to the valve body. The 6.2L V8 engine also has issues, with recalls related to the connecting rods and crankshaft. 

2021-2024

• Issues: Affected by a massive recall on the 6.2L V8 engine for connecting rod and crankshaft issues.
• Note: GM has extended the warranty on these engines, but parts for the recall may be difficult to get. 

Other potential years to watch for

• 2019: Early production models had build quality issues.
• 2005: Some sources cite this year as having a higher-than-average complaint rate, though still conservative.
• 2001: Some early models had brake issues.
• 2017: Has reported engine issues and stalling. 

What size door speakers are in a 2004 GMC Sierra?

6-1/2"
The standard door speakers in the 2003-04 Silverado/Sierra are 6-1/2" models, so replacement speakers are easy to find.