On RL4FO3 automatic transmissions there is a nut and washer on the top of the valve body, that holds that long screw, there are no threads in the valve body so it will never get tight , to replace you need to remove the valve body or get mighty lucky using a thin long tool with a 90 degree bend in it to hold down the nut and washer until you can grab a thread, the good news is you know where the general location of the nut and washer are. If you can't get it to start, and decide to remove the valve body, be really careful those gaskets are brittle. Go to a break down on that transmission and you can see the bolts that actually hold the valve body on the transmission body. The parts house should have told you this.
I never change filters on these transmissions unless I am rebuilding them. Just drop the pan squirt some brake cleaner on the filter until all of the grime comes off of it and then let it dry completely. Clean you pan, put it back together, add new fluid.
I have seen those transmissions run years without that long bolt in them. most of the time they hit a bump and the nut and washer fall to the bottom of the pan. The nut and washer are stainless steel so they might not be attracted to the magnets in the pan depending on the grade of stainless they happened to be using that day. I would try to use a long skinny 90 degree tool to get the nut and washer started back on the screw and then you will have more peace of mind.
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