6 3/4" Front Speakers and 4x6" Rear Speakers.
Source: My 2000 Silverado LT Ext Cab 4dr 4x4 with Z71 pkg.
It has 4x6" speakers.
4x6 :)
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
4x6
Stock speakers should be 4x6's
My 1996 Silverado Ext. Cab has 6.5" in the door panels as well as 4x6" in thee rear pillers..
4X6
4x6
Both dash and rear panels use 4x6 in speakers
4x6" speakers in the dash. 6 1/2" round speakers in the doors and 3x10" or 3x12" in rear panels if ext cab
Front speakersFront Door: 6-1/2" factory speaker noteFar rear speakersBehind Seat: 4x6"
4X6 speakers