I know that truck inside out and outside in. The engine and body are Grounded directly to the chassis. You can groundany audio amplifier to the floor of the truck and you have EXCELLENT ground to provided to that amp!
All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
What engine? V8? 18436572 for chevy 1991 silverado v8 350 diagram
It is screewed into the passenger side of the engine, just in front of the starter.
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NO it has nothing to do with the engine dieing. You have other problems.
85 mph.
Passenger side, near the bottom of the engine, just behind the exhaust manifold. It bolts to the back of the engine and sticks through the bell housing to the flywheel.
It is bolted to the frame and the back of the head. You can put it anywhere as long as it is bolted to the frame and the engine.
YES it is.
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
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It is inside of the fuel tank.