If you remove the old filter, doesn't the trans oil run out?
Being an old dog and resistant to new tricks, I still always fill a new filter to whatever level will allow me to install it with no or little mess. And filling with both release valves removed works well. If it's a complete drain and fill (on a 149 anyway) I just remove the top plate. I can inspect the interior and run a magnet around as part of the inspection. Even when filling that way, I remove the release valves so the case doesn't air lock. Almost thirty years of hydraulic repairs has put some fear into me.
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