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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.
The stock size of the speakers in a GMC Sierra are 4x6 in the rear. If they have not yet been switched out with an aftermarket, they will be the 4x6.
The 2007 GMC Sierra-1500 has 16 valves.
The 2007 GMC Sierra-2500HD has 16 valves.
The 2007 GMC Sierra-2500HD has a V8 engine.
The 2007 GMC Sierra-3500HD has 16 valves.
The 2007 GMC Sierra-3500HD has a V8 engine.
The 2007 GMC Sierra-1500 has a V8 engine.
Delco
All four speakers are 4x6. I just ordered new 4x6's for my 93 GMC Sierra, and that is the stock size.
The 2007 GMC Sierra-3500HD is a gas-powered vehicle.