Mack Dm400 — Years to Avoid
Reliability breakdown of every Mack Dm400 model year. Based on NHTSA owner complaints, federal recalls, and safety investigations.
How we calculate this
Each year receives a composite risk score based on NHTSA owner complaints, federal recalls, safety investigations, and technical service bulletins. Years scoring more than 2x the model's average are flagged as “years to avoid.” Years in the lowest risk bracket are marked as “best years.” All data is sourced from the National Highway Traffic Safety Administration (NHTSA).
Which Mack Dm400 Years Should You Avoid?
The Mack Dm400 shows relatively consistent reliability across model years, with no single year standing out as significantly worse than others.
If you're shopping for a used Mack Dm400, consider the 1974, 1973 model years — these have the fewest reported issues relative to other years.