Using a Weak Pension Plan as a Cash Cow
Floyd Norris column on how Navistar International used its weak pension plans as cash cow by selling $175 million of its stock to pension plans and putting that money back into plans; says Navistar last week raised $190 million by selling five-year convertible bonds in deal underwritten by Credit Suisse First Boston; adds Navistar's credit rating is below investment grade, but interest rate on bonds is only 2.5 percent; graph (M)