The VSS (Vehicle Speed Sensor) is the one that comes to my mind and it is located on the transmission itself.
Although your issue is that the OD doesn't engage, or will not stay engaged, this doesn't mean that it is necessarily the OD itself. No OD is the safe mode that a transmission goes into when the computer senses a problem with the tranny. Usually, it is electrical if you aren't having problems with slipping, clunking, etc.
Hope this helps.
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Wednesday, December 24th, 2008 AT 3:06 PM