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2006 Hummer H3 Race Truck - Project H3

2006 Hummer H3 Race Truck Shock Hoops
Under the hood, the build... 
   
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2006 Hummer H3 Race Truck Shock Hoops
Under the hood, the build team fabricated shock hoops onto the forward 'cage. As shown, the inner fender sheetmetal was trimmed to clear the shock body. Additional trimming was required to accommodate the external-bypass shock reservoir.
2006 Hummer H3 Race Truck Rear Suspension
Out back, the truck uses the... 
   
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2006 Hummer H3 Race Truck Rear Suspension
Out back, the truck uses the factory leaf springs and stock rear axle. The team will try the stock spring rate and then tweak the packs from there based on some field testing. Axle gearing is 4.56:1.
2006 Hummer H3 Race Truck Upper Rear Shock Mounts
The rear upper shock mounts... 
   
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2006 Hummer H3 Race Truck Upper Rear Shock Mounts
The rear upper shock mounts are attached to a tubular structure that spans the rear framerails and ties to the rear 'cage hoop (angled tube seen here). This setup was optimized to allow fitment of the longest shocks possible without cutting through the rear bed floor, per race organization rules.
2006 Hummer H3 Race Truck Leaf Spring Plates
The stock lower leaf-spring... 
   
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2006 Hummer H3 Race Truck Leaf Spring Plates
The stock lower leaf-spring plates were modified in the rear. Shock tabs were added, and a portion was boxed for strength and shock eye protection. Stock U-bolts secure the leaf packs to the axle. Custom Fox Racing shocks are used in the rear suspension as well.
2006 Hummer H3 Race Truck Shock Mount Side
Here you can see another side... 
   
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2006 Hummer H3 Race Truck Shock Mount Side
Here you can see another side view of the upper shock mount above the framerail. To determine shock length, the rear sway bar was disconnected and the leaf packs were reduced to just the main leaf and the overload. Then, the axle was fully articulated to determine distance between shock mount points and to check bumpstop function.
2006 Hummer H3 Race Truck Seat Rails
To start the interior work,... 
   
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2006 Hummer H3 Race Truck Seat Rails
To start the interior work, the driver seat position was determined. The stock rail adjusters were used and a MasterCraft seat was mated using a set of custom brackets to set the height and pitch of the seat to suit driver Rod Hall's preferences.
2006 Hummer H3 Race Truck Rollcage Fabrication
It was time to start on the... 
   
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2006 Hummer H3 Race Truck Rollcage Fabrication
It was time to start on the safety side of the project with the fabrication of an internal rollcage. Two-inch by 0.120-inch-wall DOM tubing was used for the construction. Separating the body and frame by about 6 inches allowed fabricator Doug Moore easier access for the build. The pillar tubes all go through holes in the floor and attach to points on the framerails.
2006 Hummer H3 Race Truck Cage Corner
The build team used substantial... 
   
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2006 Hummer H3 Race Truck Cage Corner
The build team used substantial triangulation at all 'cage nodes to provide maximum strength at every point in the 'cage. All critical and safety-related assemblies were TIG-welded on the vehicle.
2006 Hummer H3 Race Truck Cage Tabs
Where there was advantage,... 
   
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2006 Hummer H3 Race Truck Cage Tabs
Where there was advantage, the 'cage was also tabbed and bolted to the sheetmetal body. Past experience showed that this practice makes the entire vehicle more rigid with the added benefits of noise reduction and a decrease in wear on body components.
2006 Hummer H3 Race Truck Cage Joints
These custom-machined tube... 
   
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2006 Hummer H3 Race Truck Cage Joints
These custom-machined tube joints were used in a few areas where 'cage disassembly might be desired in the future. The forward hoops under the hood and around the engine are two such examples. The 'cage was also designed to allow the body to be lifted a few inches off the frame to allow full welding access at the top tubes that fit tight near the roofline.
2006 Hummer H3 Race Truck Air Pump
Forced air pumps from Parker... 
   
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2006 Hummer H3 Race Truck Air Pump
Forced air pumps from Parker Pumper Helmets were installed just behind the seats for both driver and passenger. These 12-volt pumps route filtered air into the helmets during dusty racing conditions.
2006 Hummer H3 Race Truck Rear Window Inserts
With the removal of the all... 
   
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2006 Hummer H3 Race Truck Rear Window Inserts
With the removal of the all the glass in the H3, the rear quarter-windows were replaced with aluminum sheet riveted in the factory glass channels.

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