The cable is located at the left rear (tailshaft area) of the tranny. Held in place by a pinch fitting with a 10mm bolt & nut..The speedo driven gear and carrier are held into the tail shaft housing by a retainer. This piece, (speedo gear), as I understand it rarely fails. Most likely the cable has parted.

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Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.