Thanks for your reply. I found out that for 1997 Grand Caravans, the 3 speed transmission has a third sensor (a three wire vehicle speed sensor, different from the transmission output sensor), but that my 4 speed transmission vehicle uses the transmission output sensor as the VSS.
I ordered some new ones, but when I went to replace the old ones, took out the air filter cover part, I saw that my output sensor was not connected. After looking a while, I found the cable lying on another rubber pipe. I connected it back up (keeping my existing sensors) and it's working (speedometer, odometer, and no longer in limp mode)!
Friday, July 20th, 2012 AT 2:28 AM