GMC · Canada · Crit
GMC Topkick 8500, Topkick 7500: Other
Affects GMC Topkick 8500, Topkick 7500 · 2007 — about 20 vehicles.
The hazard
On certain 7500 and 8500 series trucks, the rear drive axle housing was manufactured with steel below the specified thickness, which could result in fatigue failure over time. If failure occurs, the outboard end of the housing could eventually separate, allowing the hub, axle shaft, and/or wheel and brake assembly to separate from the vehicle. This could cause a vehicle crash with injury or death. Correction: Dealers will inspect and, if required, replace the axle assembly.
What to do
Contact your dealer; the remedy details were not included in the filing.
Critical — crash/injury risk now
High — injury risk; see remedy
Moderate — fix at next service
Low — minor / informational