It may not be your transmission. Lear how to repair 2005 3.8 Caravan shifting issues
Links to what you will need below:

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You will need:
Automatic Transmission Shift Control Kit: https://amzn.to/2TGCWaM
Oil Drip Pan https://amzn.to/2KuN8Pd
13mm Deep end socket: https://amzn.to/2r5oN9X
Open End Wrenches: https://amzn.to/2S87RuT
Socket Extension: https://amzn.to/2TMAAam
8, 9 and 10mm socket: https://amzn.to/2KumJkE
Needle Nose Pliers: https://amzn.to/2Ktv7kv