The Chrysler arm of DaimlerChrysler AG said it was recalling 157,000 Dodge Ram pickups, including the first recall of its new 2002 Ram models, to fix two separate problems. The automaker said it would recall 46,000 2002 Ram pickups to fix a potentially weak weld on a rear axle bracket. It said the recall affects only four-wheel-drive models built before November 2001, and that no complaints had been received about the problem.The other recall involves 111,000 heavy-duty Ram pickups with diesel engines built between 1997 and 1998. Chrysler said a fitting in the engine compartment could corrode from road salt used on Midwestern roads in the winter.