Transmission on 1998 Chevrolet Astro

If you have the van in neutral and you tow from the rear will it damage the transmission

1 answer
If you mean "picking up the rear of the van (rear wheels off the ground)" to tow it- no it won't hurt the transmission.
If the van is all-wheel-drive (which some astro vans were), it needs to be put on a rollback (flatbed) towtruck.