NHTSA Complaint #11448503 — 2021 JEEP GLADIATOR

In December, 2021, my 2021 Jeep Willys Gladiator became unstable at normal freeway speeds (70-75 mph) on ~8 occasions. At these speeds, the slightest bump or surface irregularity stimulates a violent and sustaining side-to-side vehicle shudder from the front suspension that was so extreme that it splashed my cola and ice from the center cup holder to the dashboard and doors. R-L-R Steering inputs had no effect and hard braking had no effect until the vehicle slowed to around 60 mph; where stable vehicle behavior restored. This extreme instability and needed hard braking creates a serious driving hazard. The dealer is installing a new steering damper. The engineer in me says there is a bearing, bushing or ball joint as root cause. This defect manifested at ~23,000 miles and occurs more readily as the temperatures drop below 20 deg F. This failure mode is severe, occurs without warning, is not detectable until it occurs and its effect is panic-inducing. My Jeep has stock, factory aluminum wheels and normal sized Michelin All-Season radial tires in good balance with no visible or abnormal tread wear. I ordered this vehicle new on 3/1/2021. The 'Gladiator forum' calls this condition "death wobble". Anecdotally, the condition appears to be associated with vehicles having "lift kits" as well as stock vehicles. My 'Willys Jeep is built by FCA with a modest suspension lift relative to the base Gladiator models. Other (anecdotal) owner information has identified loose ball joints, defective drag link bushings and steering free play as root causes in other new, low mileage vehicles. I am a retired engineer with vehicle development, professional driving and prototype vehicle experience. This is a dangerous condition that needs immediate correction. A 7-month old vehicle with 25,000 miles in excellent condition, no accident history and no modifications SHOULD NEVER DO THIS. A steering damper may reduce this death wobble but there is a more likely root cause.