i have a 01 regular cab dodge dakota and i want to put my 12in sub in ...i have found some sub cases that are 4.5" at the top and 6 at the bottom..anyone have regular cab setups that could give me some tips?? thanks

 

i built a custom box that was 5 at the top and 9 at the bottom and i ended up trimming it down two inches. I have a 99 dodge d but i dont know what the differneces are. I think in mine 4 on top and 8 on the bottom would have been perfect by 21 inches. This is only if you cut the back wall piece.

 

is it a center console or a behind the bench setup?
either way, a custom box would probably be the easiest.
the big thing is to make sure the airspace in the box is enough for that sub, a box too small will restrict cone movement, killing the sound quality and wearing the sub out much faster, could take years off the life of the sub

 

yeah def make sure there is somewhere for that air to go or else bad **** will happen as batty said

 

At least its a regular cab, try putting any subs in a QC.. Installing anything is a nightmare. I decided to take out my driver side rear seat...But when you are building this box def consider your subs recomended volume..Rockford Fosgate has a great volume calc http://www.rockfordfosgate.com/rftech/box_wizard.asp , put your box design ideas in and see what works. Good luck with the install