My real main seal is leaking

Hello, I'm Danny.

Here is the information you requested. In order to gain access to the rear main engine seal you will need to remove the transmission. Here is a tutorial showing how to remove a standard transmission which is similar to an automatic transmission:

https://www.2carpros.com/articles/transmission-replacement-removal-manual

I've attached picture steps below on how to remove and replace your automatic transmission and how to change the rear main oil seal on your van. Hope this helps and feel free to ask any further questions if needed. Thanks for using 2CarPros.