Vehicle report
1976 MACK DM400
This model year
What the record shows
The 1976 Mack Dm400 is the 6th model year of a nameplate NHTSA records from 1971 to 1976.
The federal record holds 21 service bulletins for it.
Counts are reports, not rates. A complaint is something an owner chose to file; it is unverified and unadjusted for how many of these cars were sold, so the useful comparison is against other model years of the same car. Recalls and investigations carry more weight because a manufacturer or regulator acted on them.
Reading this report
Complaint counts are reports filed with NHTSA, not failure rates. A common model collects more of them than a rare one that breaks more often.