- The problem
- The right hand clearance lamp is obscured, from certain angles of vision, by the in-line precleaner air cleaner cap. The involved vehicles fail to conform to federal motor vehicle safety standard no. 108, "Lamps, reflective devices, and associated equipment".
- The fix
- Dealer will replace the air cleaner with one of acceptable height.
Vehicle safety record
1977 Mack RM400 Problems, complaints & recalls
No owner complaints about the 1977 Mack RM400 have been filed with NHTSA. It is covered by 1 recall, the latest in December 1981 for the exterior lighting.
NHTSA data checked
CAbout as many problems as a typical RM400 year, for its age
- Complaints
- 0
- Recalls
- 1
- Crashes
- 0
- Fires
- 0
- Injuries
- 0
- Deaths
- 0
1977 Mack RM400 recalls 1
Recall repairs are free. Your dealer fixes them whether or not you bought the car there - check your VIN at nhtsa.gov/recalls to see if yours is done. What to do
What owners say
Be the first RM400 owner to share.
Problems or none - your experience is exactly what the next buyer is looking for. Write it now
No complaints about the 1977 Mack RM400 yet
No owner has filed a complaint about this vehicle with NHTSA. If yours has a problem, share it here and report it to NHTSA.
Mack RM400: every year compared
All RM400 yearsQuestions about the 1977 Mack RM400
Does the 1977 Mack RM400 have any recalls?
Yes - NHTSA lists 1 recall for the 1977 Mack RM400: exterior lighting (December 1981). Recall repairs are free at any authorized dealer. Enter your VIN at nhtsa.gov/recalls to see whether yours has been fixed.
How many complaints has the 1977 Mack RM400 had?
None have been filed with NHTSA so far.
Is the 1977 Mack RM400 a reliable vehicle?
Its Safety Index is 50 out of 100 (grade C: about as many problems as a typical Mack RM400 year, for its age). The index weighs complaints, crashes, fires, injuries, deaths and recalls against how long the vehicle has been on the road, compared with the same model's other years. It is not a measure of every repair - read the complaints and owner experiences, and have any used vehicle inspected before you buy.
What should I do if my 1977 Mack RM400 has a problem?
If it is a safety problem, stop driving it if it is unsafe and contact your dealer. Report it to NHTSA at nhtsa.gov/report-a-safety-problem - enough reports start investigations and recalls - and share your experience here so other owners know what to look for.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data