Vehicle recall 77V011000 · January 1, 1977

Mack WL and WS

The lower steering shaft yoke clamp bolts on the involved vehicles may not have been sufficiently tightened.

Source: NHTSA data as of September 22, 2026. Last refreshed Sep 23, 2026, 2:43 AM UTC.

Summary: The lower steering shaft yoke clamp bolts on the involved vehicles may not have been sufficiently tightened. Should these bolts lossen and come off, the lower steering shaft could separate from the steering gear.
Remedy: The dealer will secure the clamp bolt and make the necessary modifications on the lower steering shaft, free of charge.
Notes: Vehicle description: heavy trucks.system: steering; steering shaft, lower.consequences of defect: separation of the lower steering control shaft loweryoke may result in loss of steering control and an accident.

Recall details

NHTSA campaign: 77V011000
Reported to NHTSA: January 1, 1977
Filed by: MACK TRUCKS, INCORPORATED
Owner notification: March 29, 1977
Vehicles potentially affected: 2,200
Initiated by: the manufacturer
Components: Steering › Gear box (other than rack and pinion)

Recall 77V011000 on nhtsa.gov, with the manufacturer’s documents

Vehicles covered

As listed by NHTSA. A recall usually covers only some vehicles of each model and year, often a production date range.

Mack WL (1974-1976): 1976, 1975, 1974
Mack WS (1974-1976): 1976, 1975, 1974

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