Hey,

Anybody here know if there is a sub box available for behind the back rest of the rear seat for a 1998 Ext cab F150?

Try these...

Supercrew Sound (http://www.supercrewsound.com/) They should have boxes for every cab.

Subbox.net (http://www.subbox.net/)

WELL I MAKE CUSTOM SUB BOXES FOR ANY TYPE OF VEHICLE AND IF YOU WANT I CAN BUILD YOU ONE JUST E-MAIL ME AT LAKERSFAN1302@AOL.COM AND TELL ME WHAT TYPE OF SUBS AND I THINK I ACTUALLY MIGHT HAVE A BOX THAT WAS IN MY FRIEND GABES 1998 FORD F-150 ITS PROFESSIONALLY MADE ITS AN R/T BOX FOR 2 12's??????:):)

I have a hard time finding these sub boxes. Check out http://www.sonicelectronix.com . They have great prices on their subwoofer boxes.

thanks :)

i also have a 1998 f150, but single cab and i have a sub behind my passenger seat, was thinking of selling it. it's a 10-incher