The GMC Hummer EV is a pretty wild piece of engineering, serving up impressive capability off-road, all with a cutting-edge all-electric powertrain. Now, GM Authority has learned that some GMC Hummer EVs incorporate one important change in the chassis compared to other GMC Hummer EV models.
Per an interview with Hummer EV SUV performance engineer, chassis and suspension, Todd Hubbard, GM Authority Executive Editor Alex Luft learned that some GMC Hummer EVs do not incorporate a stability bar, while others do.
“There’s one big chassis difference between models with the 18- and 22-inch wheels, and that’s the stability bar,” Hubbard told GM Authority. “It provides the vehicle with a little more roll stiffness and it will keep the vehicle more flat when steering.”
“With the Off-Road packages, we found that there is a lot of ride improvement with the bar removal because you don’t get as much head toss or body toss,” Hubbard explains. “Basically, if you add more roll stiffness, you’re getting jostled more. You also get some articulation and traction benefits by not including the bar.”
According to Hubbard, these head toss and body toss qualities are less noticeable in the GMC Hummer EV Pickup due to its longer wheelbase, while the shorter wheelbase on the GMC Hummer EV SUV makes these qualities more noticeable overall.
For reference, the 18-inch wheels are part of the GMC Hummer EV’s Extreme Off-Road Package (RPO code Z6X), the full content of which is listed below (relevant RPO codes listed in parentheses):
- 18-inch Black aluminum wheels with machined accents (RCS)
- LT305/70R18 Goodyear Wrangler Territory MT tires (QMG)
- Full Underbody Skid Plates (NZZ)
- Driver-selectable electronically locking front differential (G93)
- Driver-selectable electronically locking rear differential (G94)
- Forward and Rearward underbody cameras (UXA)
- Black Rear D-Ring Recovery Hook (SDA)
- Rocker Protectors with Assist Steps (S6L)
As a reminder, the GMC Hummer EV (both the Pickup and the SUV) incorporate GM Ultium Drive motors and GM Ultium batteries, with the GM BT1 platform providing the underpinnings. Production takes place at the GM Factory Zero plant in Michigan.