- Vehicles
- 7,400
- Built between
- May 1977 – Oct 1977
- Models
- 12
- Recall type
- Vehicle
- Initiated by
- Manufacturer
- Owners notified
- 14 March 1978
- Repaired
- Not reported
- Unrepaired
- Not reported
Does this affect my vehicle?
This recall covers vehicles built between May 1977 and October 1977. If yours was built outside that window, it is not part of this recall.
- 1977 Mack DMBuilt May 1977 to October 1977
- 1977 Mack FBuilt May 1977 to October 1977
- 1977 Mack HMMBuilt May 1977 to October 1977
- 1977 Mack MBBuilt May 1977 to October 1977
- 1977 Mack RBuilt May 1977 to October 1977
- 1977 Mack RDBuilt May 1977 to October 1977
- 1977 Mack RLBuilt May 1977 to October 1977
- 1977 Mack RMBuilt May 1977 to October 1977
- 1977 Mack RSBuilt May 1977 to October 1977
- 1977 Mack UBuilt May 1977 to October 1977
- 1977 Mack WLBuilt May 1977 to October 1977
- 1977 Mack WSBuilt May 1977 to October 1977
What the defect is
A deficiency exists in the welds securing the rear spring insulator bracket to the axle housing. This is due to improper positioning of the weld, in relationship to the bracket and axle housing. Failure of the welds would cause separation of the spring insulator bracket and the axle housing, resulting in improper alignment of the affected axle.
What gets fixed
DEALER WILL REWELD THE INSULATOR SPRING BRACKET AT NO COST TO OWNER.
Timeline
- Vehicles builtMay 1977 to October 1977
- Recall reported to NHTSA21 November 1977
- Owners notified14 March 1978
Your rights
A safety recall repair is free. Under US federal law the manufacturer must fix a safety defect at no cost to you — no charge for parts, labor or diagnosis — whether or not you are the original owner. A dealer cannot charge you for recall work, and cannot require you to have bought the vehicle from them.
That entitlement is not unlimited. It applies where the vehicle was first sold less than 15 years before the recall was announced — 5 years for tires. Past that a manufacturer may still do the repair free of charge, and many do, but they are no longer obliged to. This recall was reported on 21 November 1977.
To arrange the repair, contact any franchised dealer for the brand. If a dealer refuses the work or tries to charge for it, you can report that to NHTSA at nhtsa.gov/recalls or on 1-888-327-4236.
Official source
- Recalling manufacturer
- MACK TRUCKS, INCORPORATED
- Recall initiated by
- MFR
Everything on this page — the models listed, the build dates and the repair figures — comes from the manufacturer's filing to NHTSA and describes the vehicle line as a whole, not any individual car. Only the manufacturer can confirm whether a specific vehicle is affected, and whether its recall work has already been carried out. Check yours by VIN and read the official notice at nhtsa.gov/recalls.
Additional notes
Vehicle description: heavy trucks.system: suspension; tandem axle.consequences of defect: this condition could cause a loss of vehicle controland a vehicle accident.
Check your own vehicle
This page describes the recall, not any one car. To see which recalls cover a specific vehicle, search by make, model and year.
A VIN lookup here identifies your vehicle and shows recalls issued for that make, model and year. It cannot tell you what is still open on your individual car - only the manufacturer knows that. Search by VIN instead, or check your VIN at nhtsa.gov for whether a recall is still open on your individual car.