Dodge Grand Caravan Forum : “'96 Grand Caravan Transmission not shifting sometimes, Can't figure it out”

'96 Grand Caravan Transmission not shifting sometimes, Can't figure it out

I've got a 96 grand caravan and it has a problems shifting sometimes. Sometimes the van will not shift past 3rd gear, I can shut the van off and start it back up and it will shift fine again.

Then if its really cold out (I live in Northern MI) or if I don't drive it for a few days in the winter I'll start driving and it won't shift past 3rd AND the speedometer will not work. After I drive it like that for about 10 mins or let it idle for about a half hour it will go back to normal shifting.

I am guessing this may be a sensor on the trans but I am not sure, and if it is I am not sure what sensor it would be! Any ideas? This is driving me crazy...Thanks!
Andrew