Breaking up is hard to do -- as General Motors Co (GM.N) is still learning after a four-year separation from the finance company that once shared its name. As GMAC, now renamed Ally Financial, prepares for a stock offering to start repaying taxpayers for its $17 billion bailout, GM is being forced to rethink its go-it-alone strategy -- and some analysts and bankers say GM still needs its former affiliate, after all. "Has GM discovered a way to sustainably run an auto company without a significant captive finance (subsidiary)? We do not think so," Morgan Stanley analyst Adam Jonas wrote in a Jan. 20 note for clients.
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