Reassuring points
Reliability- The `GMT800` base shares many components with the Tahoe, Suburban and Silverado, so the mechanical side is more familiar than the unusual body suggests.
- The `5.3 LM7` V8 handles mileage well if oil changes, cooling upkeep and automatic gearbox service were done properly.
- A healthy `Midgate` system gives the `Avalanche` genuine day-to-day versatility without completely sacrificing comfort.