Ford Transmission :: 2005 F350 - 3 To 4 Seconds Delay When Trying To Engage Drive Or Reverse

Still having issues with the transmission on my 05 F350. I posted before that it would take a few seconds to go into drive or reverse. The fixes were to change filters and do hot flush. I had the dealer do a hot flush, and then I put about 1000 miles on it. That didn't seem to fix anything, so I went back in and asked for more info. They did not change the filters. I thought they did, but found out they did not after the fact, so I decided to change the filters myself.

The interior filter was easy to change. The fluid was clean, and the magnet had shavings on it but nothing that seemed extraordinary. The exterior filter is impossible to get off. I reviewed posts on here before trying, so first was the impact wrench, then the pipe wrench, then the pipe wrench with a block wedged in to keep the thing from bending, still no luck. The cast nut broke off well before the pipe wrench came out of the drawer. How to get that thing off. I read on here somewhere that no fluid goes through that until 180 degrees, is that correct?

Scanguage says it rarely goes over 160, except for last evening when I was stuck in traffic. It went to 187, with ECT at 208. During this period, traveling under 40 most of the time, the transmission was shifting erratically, to the point I wanted to pull over and allow it to cool down. But traffic broke free, speed went up, and temps went down. Shifting returned to normal, except when trying to engage drive or reverse. The 3-4 second delay persists at any temp, and there doesn't seem to be any slippage. Just delayed and sometimes hard engagements. I'm at a loss for whats wrong.