Forgot O-rings on transmission filter

I just replaced the transmission fluid and filter on my 2000 Ford Ranger and realized I forgot to put the O-rings on the filter. Do I have to drop the pan and put the O-rings on or can I leave them off without any damage to the transmission? :confused:

You need to replace the seal. If not the fluid can bypass the filter and cause drivability problems.

The pump might not be able to pick up the fluid from the bottom. Which I'm sure would hurt tranny. Drop the pan again and put O ring in. I would reuse the fluid again but be real careful to drain in clean pan and keep all dirt out of the fluid