To be absolutely certain if *your specific* 2005 Grand Caravan has a transmission cooler and what type, you need to:
* Check your owner's manual: This is the best source for information specific to your vehicle's configuration.
* Inspect your vehicle: Look closely at the front of your radiator and around the transmission for any additional cooling lines or a separate cooler unit.
Without knowing your specific trim level and options, it's impossible to definitively answer.