Chrysler Corp. is rejecting a consumer advocacy organization's request to recall 500,000 cars and minivans with a newly designed automatic transmission, insisting its flaws have been worked out.

"We addressed those problems quickly and believe the transmission is now fully competitive from reliability and durability standpoints and ahead of the competition in many other areas," Chrysler spokesman Tony Cervone said.But the Center for Auto Safety says the Ultradrive transmission, introduced in 1989 models, is still plagued by sticking between gears, clutch burnout, computer controller failure and internal damage.

The nation's third-largest automaker introduced the Ultradrive four-speed transmission in late 1988.