* 4L80E: This four-speed automatic was very common.
* Allison 1000: A heavier-duty automatic transmission, often found in models with higher GVWR or more demanding applications.
To know for certain which transmission is in *your* specific van, you need to check:
* The vehicle's identification number (VIN): A dealer or online VIN decoder can use this to determine the original specifications.
* The vehicle's build sheet (if available): This would definitively state the transmission.
* The transmission itself: Look for markings on the transmission case.
Without knowing your van's VIN or build sheet, it's impossible to say definitively which transmission it has.
