Following the lead of other cost-cutting U.S. auto parts suppliers, BorgWarner Inc. has told many of its retired hourly workers from a factory in Muncie , Ind. , that they will soon be paying more for health care benefits in part because of a downturn in SUV sales by Detroit automakers Ellen Dannin, a law professor at Wayne State University, said if the BorgWarner health cuts constitute a breach of contract, then the UAW could file an unfair labor charge with the National Labor Relations Board or pursue other legal avenues.