Check out our huge selection of Silverado/Sierra Custom Truck Enclosures  If you don't see what you need, just ask....more items to come.....




 

 
Silverado And Sierra Custom Truck Boxes For
Extended Cab Crew Cab & Regular Cabs
Our Avalanche Boxes are Here

If there's one thing we've learned over the last couple years, it's that GM Full Size Truck owners are serious about their bass.  Everyone has different tastes on how their setup should look and perform.  That's why we've worked extremely hard to assemble the widest selection of custom enclosures specifically designed to fit and work in these trucks without the need for huge sacrifices in passenger or cargo space.  Not only do they sound great, but they are more affordable than comparable items elsewhere.  So whether you're looking for a little more lower end, or some major slam, we have something for you.  Nobody matches the styling and fit of a GM Truck box from Subthump.  We must be doing something right because we build more GM full size boxes than any other box on our website.  So try one out for yourself and you'll find out why everyone recommends getting a Subthump box.

Silverado/Sierra EXTENDED CAB Boxes    (Scroll down for Crew Cab & Reg. Cab Boxes)


2007 & UP GM New Body Style
Extended Cab Dual Downfire Boxes
Fits under the rear seat of late 06 and 2007&UP 
Silverado and Sierra x-cabs
 For more info on this new box, click here

2007 & UP GM New Body Style 
Extended Cab Single Single Downfire Box
Fits under the rear seat of late 06 and 2007&UP 
Silverado and Sierra x-cabs
 For more info on this new box, click here


99-07 'Classic' GM Extended Cab Dual 
Dual 10 Downfire With Amp Space 
Fits under rear seat.  holds two 10s  in a downfire position and has a convenient spot in the center to mount your amp on.  
For more info on this killer box, click here
 

99-07 'Classic' GM Extended Cab Dual 
ULTRA DEEP Dual Downfire box
Fits under rear seat.  holds two 10s or two 12s
 in a downfire position. This box has a 7" mounting depth that you will not find anywhere else.  Great for those really deep 12s.  
Click here for more on this Brute 
...Our best selling x-cab box!  See why

99-07 'Classic' GM Extended Cab  
ULTRA DEEP Single Downfire box

Our Ultra deep box is now available in a single 10/12 
(round or square)

item:ctb99-110/112 ultra
mounting depth: 7.0 
air space: .92
Price: $135

Select Options for your Box 
quantity:  
speaker size:
carpet color:



99-07 'Classic' GM Extended Cab Dual 
ULTRA DEEP Single 12 Slot Ported Box
Fits under rear seat.  Holds one 12" sub downfire and
is slot ported out the front (not the side) for really low deep earth shattering bass.  For more on this new box, click here

1988-1998 GM Extended Cab Single Downfire box
 Fits under rear seat.  holds one 10 or one 12 in a downfire position.  

item:C8898S
mounting depth: 5.5"
air space: .9
Price: $109

 front view
bottom view

Select Options for your Box
quantity:  
speaker size:
carpet color:


1988-1998 GM Extended Cab Dual Downfire box
 Fits under rear seat.  holds two 10s or two 12s
 in a downfire position.  

item:C8898
mounting depth: 5.5"
air space: .86ea
Price: $139

Select Options for your Box
quantity:  
speaker size:
carpet color:


1988-1998 GM Extended Cab Dual Front Fire box
 Fits under rear seat.  holds two 10s or two 12s
  in a forward fire position.  

item:C8898ff
mounting depth: 7.5"
air space: .72ea
Price: $139

Select Options for your Box
quantity:  
speaker size:
carpet color:

Silverado/Sierra CREW CAB Boxes

2007 GM New Body Style Crew Cab 
Dual 10 and 12 Downfire Box

it's Awesome, check it out Here
2007 GM New Body Style Crew Cab 
Dual 10 Downfire Box with Amp Space

Totally Amazing, Check it out Here

2001-2007 'Classic' GM HD Crew Cab Dual Downfire
Fits under rear seat of 1/2 and 3/4 ton trucks.
 For HD crew cabs only
Holds two 10s in a downfire position.  
A hard to find box and we have it!
Our best selling box for the HD's 
For more Info on this incredible box Click Here
 item:CHD
mounting depth: 6-1/8" standard
(expandable to 6-5/8")
air space: .55ea.
Price: $148

Select Options for your Box
quantity:  
speaker size:
select year
carpet color:



2003-2007 'Classic' 1/2 Ton GM Light Duty Crew Cab 
Dual Downfire Box
Fits under rear seat of non HD crews only
 Holds two 8s or 10s in a downfire position.  
An impossible box to find and we have it! 
For more on this amazing box, Click Here

item:CHLT
mounting depth: 5.5"
air space: .55ea.
Price: $158

Select Options for your Box
quantity:  
speaker size:
select year
carpet color:


2001-2006 GM Crew Cab  Box
 Fits behind the rear seat.  Will fit all HD crews 
from 2001-2007 Classics

Holds 2,3 8s or 2,3 10s

item:CHDB
mounting depth: 5.25
air space: .64ea.
Price: $129

Select Options for your Box
quantity:  
speaker size:
carpet color:


2001-2007 'Classic' GM HD Crew Cab  Box 
With Amp Space
 Fits behind the rear seat.  Will fit all HD crews from 2001-2006 Plus 07 Classic Crews.  Features a convenient built in spot for your amplifier.

Holds two 8s or 10s

item:CHDBamp
mounting depth: 5.25
air space: .5ea.
Price: $149

Select Options for your Boxes
quantity:  
speaker size:
carpet color:


Keep all your equipment together.  Mount it up, drop it in and wire it, and you're ready to rock.  


note: installation requires removal of the flip panel in HD and non HD and as well as removal of side vent pieces in non HD

Silverado/Sierra Regular Cab Boxes

 
1999-2007 GM 'Classic' Regular Cab
Dual 10/12 Box with Amp Space
 Fits behind the seat and holds two 10s or 12s.  Also has a space in the middle to hold an amplifier.
Click Here for more info on this box

   

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Last modified: 05/28/2008