As much as 70 percent of the General Motors ISV (Infantry Squad Vehicle) incorporates commercial-off-the-shelf (COTS) components from the Chevrolet Colorado ZR2 Bison. According to the executive chief engineer at GM Defense, Performance Variants and Motorsports, Mark Dickens, the ISV is basically identical to the Chevrolet Colorado ZR2 from the waist down.
Dickens spoke to GM Authority in an interview at the 2019 SEMA Show this week, providing details on the Bow Tie brand’s latest defense vehicle. Dickens outlined how the ISV uses high-performance parts developed and proven by Chevrolet Performance Engineering, including suspension and drivetrain components.
Interestingly, the ISV’s suspension tuning is also identical to the Chevrolet Colorado ZR2 Bison. Note that the production version will come with a 1.5-inch suspension lift, while the model pictured here does not include the lift. Dickens also pointed out that the wheels on the ISV shown here are beadlock wheels from the ZR2 Bison, whereas the production ISV will have different wheels equipped with run-flat tires, per the requirements set by the Department of Defense.
What’s more, the engine tune is slightly different between the ISV and Colorado. We’ll post more information on the engine spec differences soon.
As for the similarities in terms of suspension, drivetrain, and engine components, the ISV and Chevrolet Colorado ZR2 Bison share the following:
- Long-travel Multimatic DSSV dampers
- Long-travel rear leaf springs
- Jounce shocks
- Front upper control arms
Engine and Drivetrain:
- 2.8L LWN inline four-cylinder turbo-diesel Duramax
- GM Hydra-Matic 6L50 MYB six-speed automatic transmission
- Steel driveshaft
- Underbody skid plates
- Ball-spline half shafts
Most of the parts listed are available either on the Chevrolet Colorado ZR2 Bison, or as Chevrolet Performance race components. It’s also worth noting that the frame is the same for both vehicles. Further shared components include the shifter, steering wheel, steering column, pedals, braking system and ABS module.
“The ISV can be in any part of the world and drive into a Chevy dealership and order up the replacement part,” Dickens told us.
The high degree of parts commonality allows GM to scale production of the ISV, thereby making it less expensive to bring to market.
Earlier this year, the U.S. Army awarded GM Defense LLC (a division recently established within GM) a $1-million contract to develop its new Infantry Squad Vehicle (ISV) for prototype testing and evaluation. GM is currently competing for the contract with two other finalists, and a final decision is expected by March.