UAW plans to strike Mack Trucks for first time in 35 years

Workers stayed on the job under an agreement that expired October 1

(Photo credit: Mack Trucks)

The United Auto Workers plans to strike Mack Trucks operations in three states on Sunday, the first walkout at the heavy-duty truck maker in 35 years.

UAW Local 677 has 3,500 members at plants in Pennsylvania, Maryland and Florida. About 2,400 of the workers are in Lower Macungie Township in Pennsylvania’s Lehigh Valley.

Workers stayed on the job under terms of a three-year agreement that expired October 1. The extension was set to expire at 11:59 p.m. Saturday. Workers voted Sept. 20 to authorize a strike if necessary.

“We are disappointed that the company failed to provide any substantial offer prior to the October 1 expiration date or during the period in which we extended the contact,” Ray Curry, secretary-treasurer of the UAW and director of its Heavy Duty Truck Department, said in a letter to William Waters, director of Employee and Labor Relations for Volvo Trucks North America.

Mack and its sibling Volvo Trucks are part of the Volvo Group of Swedish manufacturer Volvo AB. 

Curry said the union would be available to resume negotiations on Monday, Oct 21, meaning the strike presumably would last for at least eight days.

Surprised and disappointed

“We are surprised and disappointed that the UAW decided to strike, rather than

to allow our employees to keep building trucks and engines while the parties continued

to negotiate,” Mack Trucks CEO Martin Weissburg said in a statement.

“The positive working relationship between local UAW leadership and management at our facilities was clearly in evidence throughout the negotiations, and progress was being made,” Weissburg said.

Mack and Volvo Trucks are the only major heavy-duty truck makers that produce all their trucks for North America in the United States.

Mack “continues to compete against products built in lower-cost countries,” Weissburg said, but it has no plans to move production. Mack has invested more than $400 million in its plants and logistics network over the last 10 years. SInce 2015, Mack has insourced work that has created more than 500 jobs in its U.S. factories, Weissburg said.. 

“We have significant new investments in both facilities and products on the way,” he said.

Union grievances

Curry’s letter included a list of unresolved issues including wages, cost-of-living adjustments (COLA), job security, skilled trades, work schedules and health and safety.

The UAW last walked out at Mack Trucks in 1984. The strike lasted nine days, according to the Allentown Morning Call. The current agreement was reached after a one-day extension in 2016, the newspaper said.

The downtime during the strike comes as the backlog of Class 8 trucks waiting to be built is shrinking. Mack and Volvo each plan two weeks of downtime in the fourth quarter to adjust production to demand.

Mack, which makes only Class 8 trucks, is a major producer of construction, refuse and off-highway models in addition to the over-the-road Mack Anthem. It has a 7.4% market share, down two-tenths of a point from the same time a year ago.

Upcoming FreightWaves Events
Compliance

Brokerage Compliance Symposium

The day before F3. Every compliance issue you face - fraud exposure, carrier liability, FMCSA rules, cargo theft, insurance gaps - navigated by attorneys and operators defining best practices in a changing industry.

October 26, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
Awards

F3 Awards Dinner

The night before F3. FreightTech100 companies honored. FreightTech 25 and Shipper of Choice winners revealed live. Cocktail reception into dinner and live music - 300 industry leaders in one purpose-built room.

October 26, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
FreightTech

F3: Future of Freight Festival

Industry-defining keynotes, rapid-fire technology demos, and industry leaders networking in experiences across Chattanooga - plus the inaugural F3 Awards Dinner featuring the FreightTech and Shipper of Choice reveals.

October 27, 2026 – October 28, 2026
The Signal at Chattanooga Choo Choo • Chattanooga, TN
Register Now
Compliance Brokerage Compliance Symposium Oct 26 • The Signal at Chattanooga Choo Choo • Chattanooga, TN

The day before F3. Every compliance issue you face - fraud exposure, carrier liability, FMCSA rules, cargo theft, insurance gaps - navigated by attorneys and operators defining best practices in a changing industry.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now
Awards F3 Awards Dinner Oct 26 • The Signal at Chattanooga Choo Choo • Chattanooga, TN

The night before F3. FreightTech100 companies honored. FreightTech 25 and Shipper of Choice winners revealed live. Cocktail reception into dinner and live music - 300 industry leaders in one purpose-built room.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now
FreightTech F3: Future of Freight Festival Oct 27 – Oct 28 • The Signal at Chattanooga Choo Choo • Chattanooga, TN

Industry-defining keynotes, rapid-fire technology demos, and industry leaders networking in experiences across Chattanooga - plus the inaugural F3 Awards Dinner featuring the FreightTech and Shipper of Choice reveals.

The Signal at Chattanooga Choo Choo • Chattanooga, TN Register Now

Alan Adler

Alan Adler is an award-winning journalist who worked for The Associated Press and the Detroit Free Press. He also spent two decades in domestic and international media relations and executive communications with General Motors.