8" sub suggestion

I think the cabs of the 04's are a little too different than the 11's. I think it runs 2007 to 2013 are the similar backseats. I appreciate the offer, though!
On my '11 ext cab the big difference was the transmission hump at the rear it widened a lot more than the 99-06 trucks. The 07-13 boxes will fit in the 99-06, but not vice versa.

 
In the 99 to 06 ext cabs the sub enclosures are usually straight back from the front of the box to the rear.

In the 07 to 13 ext cabs the sub enclosures are angled to fit over the rear of the ****** hump.

The 07 to 13 humbs are almost double in width at the very rear.

See here, the hump's height increases as well as its width.

C5FVkL2.jpg


See the inside of this box? That diagonal surface is to clear the hump.

maxresdefault.jpg


Also see this for the bottom of the box.

07chevpoly5.jpg


Now, the 99 to 06 enclosures are not as bad. SOME companies make them the same, with a different front/vertical piece, as the newer models have a taller hump.

The hump height is about doubled in the 07 to 13s. But the fronts are about the same width.

Heres a 99 to 06 box.

%24_12.JPG


Doesnt need to clear that big hump.

 
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Jrobison918

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