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All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
3200
Remove the inner kick panel. Disconnect the wiring harness. Drive the pins out of the hinges - remove door.
Remove the old and follow routing with new You will have to bleed the wheel that is affected
On that year, You can just REMOVE the battery cable for about 10 mins. Then hook it back up.
85 mph.
YES it is.
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
Was built for R12, can be converted to R134a.
It is inside of the fuel tank.
In the gas tank.