What size speakers are in a 2002 chevy avalanche?

Any configuration of the 2002 Chevrolet Avalanche will have the same general speaker setup; the truck useS6-3/4 inch front door speakers, alongside 6-3/4 inch rear door speakers. Fortunately, that's a fairly straightforward configuration and common size; if You want to upgrade to aftermarket equipment, You should have no difficulty finding suitable options from a number of different manufacturers. Though the speakers and head unit were good at the time, You may find their age showing, nearly two decades later. If You're looking to upgrade a head unit, You can find fitted options from the likes of Boss, Sony, JVC, Pioneer, Alpine, Kenwood, and others for as little as $100, or slightly more with auxiliary input and bluetooth. I'd also recommend dumping some new speakers in, as the swap shouldn't take You more than a short afternoon.