2000 Grand Caravan Odometer/Tranny

Hello All

Does anyone have any insight as to what may have caused the odometer
to stop working along with the tranny to start slipping? I haven't
had a chance to look under the vehicle yet to see if I can see any
fluid leaking. My wife said she was headed out of town when she
noticed the speedometer not working and it seemed like the motor was
"Reving" a bit. The fluid looks a little brown but doesn't smell real
bad. It does have approx. 105000 miles on, what may be, the original
tranny. Could this be an electronic issue? Back in the day I would
of guessed a plugged modulator line and/or loose nut on the
speedometer cable along with dripping fluid but now I'm stumped!!

Any thoughts would be great! Thank you very much in advance!

CB ~