Can the subwoofer in a 01 navigator be replaced with a 10'' sub?
You're probably better off staying with the same size, due to
the bass box configuration. You could upgrade the woofer, same
size, but make sure you have sufficient depth in the stock bass box
to fit. I replace mine with the same diameter JVC, it was a little
taller and but I was able to make it work by turning the gasket
upside down to give an extra 1/4" of spacing.