Without knowing the transmission type, I cannot give you a definitive answer. However, common ATF types for vehicles of that era include:
* Type F: This was a common fluid in older Chrysler products, but it's less common now and may not be the correct fluid for your van.
* Dexron-III: This was a very common ATF for many vehicles in the 1990s, but again, check your owner's manual.
* Mercon: Another possibility, but again, consult your owner's manual.
Using the wrong ATF can severely damage your transmission. Do not rely on internet information to make this decision. Find your owner's manual (or a digital copy online) and use the information provided there. If you can't find the manual, look for a sticker on the transmission itself, which may list the recommended fluid. If all else fails, contact a Dodge dealership or a reputable transmission specialist.