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All the speakers in a 1991 Chevy Silverado should be 4x6 if they are stock.
3200
85 mph.
How to change brake lines on a 1991 Buick Lesabre?
YES it is.
Inside car
Generally, a stock silverado will have four speakers; two in the dashboard and two behind the seat.
It is inside of the fuel tank.
In the gas tank.
.035 gap standard and stock
Was built for R12, can be converted to R134a.