shutters at 1500 rpms on 2007 Honda Odyssey

The van shutters like going over railroad tracks when it is at 1500 rpms and around 30 mph, also it seems to be worse when as everything is the same as listed but going up hill. Any ideas what could be causing this?

Asked by for the 2007 Honda Odyssey
sounds like the trans converter clutch is stuck engaged. take it to a shop and have them confirm it for you.