Other than checking fluid level and shift cable and mounting brackets, it could be a shift solenoid or hydraulic pressure problem and should be checked by dealer or trusted garage.
Some transmission shops were offering free diagnosis, so I would try that first and then shop around for best price.
Anytime you have no foward drive or trans is slipping you want to get it repaired ASAP, slipping especially can cause permanent damage to trans.
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Monday, February 1st, 2010 AT 8:38 AM