A strike at parts supplier American Axle Mfg. & Holding Inc. continues to idle or slow production at some General Motors Corp. manufacturing sites, but facilities that supply components to some of the auto maker’s newest vehicles so far are not in the crosshairs.

GM began idling plants on Feb. 28, two days after the United Auto Workers union struck AAM, a supplier of driveline and chassis components mostly to GM pickups and SUVs. The strike, which now extends into two weeks, followed the expiration of a 4-year labor contract.

The parts shortage is costing GM 6,003 vehicles for each day the altered work schedules continue, according to a Ward’s analysis. By the end of last week, GM had lost an estimated 24,888 units of truck production.

Partial shutdowns began Monday (March 10) at transmission plants in Willow Run and Ypsilanti, MI; and Toledo, OH, as well as at engine plants in Tonowanda, NY, and Flint, MI.

But while Flint’s altered schedule impacts production of the Hummer H3 I-5 engine, it has yet to effect the high-feature V-6 that appears in the hot-selling Cadillac CTS. Ward’s data shows a slim, 31-days supply for the luxury sport sedan.

And while Baltimore has suspended production of gearboxes bound for heavy-duty GM fullsize pickups and vans, it continues to make transmissions for the auto maker’s newly launched Chevy Tahoe and GMC Yukon 2-Mode Hybrid SUVs.

Similar hybrid units also are earmarked this spring for the Cadillac Escalade fullsize SUV and later in the year for the Chevy Silverado and GMC Sierra fullsize pickups.

As of this morning, the parts shortage had affected 28 of GM’s 60 manufacturing facilities in the U.S. and 37,279 of its 80,476 hourly employees.

However the auto maker’s business remains unaffected by the strike, with its impact limited mostly to traditional fullsize trucks and SUVs, GM spokesman Tom Wickham tells Ward’s.

The auto maker has idled plants that build the Silverado and Sierra, which are saddled with 129 and 141 days supply, respectively.

Negotiations between the union and AAM continued through the weekend without a settlement. AAM says it can no longer operate its business competitively under rules and agreements previously reached with its workers, while the UAW believes the company is making “unreasonable and unnecessary demands” that also affect workers’ pensions and health care.

AAM was created in 1994 and employs about 6,500 UAW members.