That's a very broad question on a complicated procedure. I would start with an eBay search for the service manual for your vehicle.
If it's a v8, Then it's at the end of the lower radiator hose on the bottom wright front corner of the engine under a housing that the hose is hooked to. If it's a V6, Then it's up on the front top...
Chevy trucks do not have an Inerita switch. Only ford.
You have a warped brake rotor(s). Resurface or replace the effected brake rotors.
try www.haynes.com
go to circutcity.com and look up speakers for your model truck and they will tell you what size will fit.