Thanks for all the replies.
Yes, I am the original owner of the car. I have been using Castrol ATF for Japanese cars (made in Germany). My tranny has an interesting history.
Since about 50k it was making a bit of a wining noise. I ignored it. At 100k I changed ATF.
At 130k it started leaking from the axle seals. I had my mechanic change seals. It still leaked. He checked the seals and told me it was differential.
I went to transmission shop. He rebuilt the tranny. Differential was indeed very worn and needed replacement of gears.
Then at 168k I had a problem where when hot it could essentially "go neutral" but I also got blinking D and these codes P1733 P0780 P0796.
The transmission guy reopened tranny but could not find anything at all.
Long story short, it was an engine wiring harness which I replaced with my own hands and that solved the P1733 problem.
Unfortunately, the tranny guy did not assemble the axle seals correctly (I know that now, did not know it then), and since then my tranny leaked ATF slowly.
Towards 270k I was filling 1Q every 2k miles.
At 299K I brought it to my mechanic asking him to check seals and axle play. He told me the seals were incorrectly installed, replaced seals and replaced ATF.
It stopped leaking!
Now at 304k I have this.
From what I now understand, if it were engine/tranny mounts, since the tranny range switch is on the tranny itself, it is not likely that I would get a solid D while tranny actually shifts to N due to mis-adjustment of the shifting cable. Thank you guys for helping me figure this out.
As you probably noticed, I had not changed ATF between 170k and 299k because I was pouring new quarts in every so often. I never changed the inline filter (where is it located)? I strongly suspect the transmission shop did at 130k miles.
: did you have any trouble codes when you had similar symptoms? I don't have any codes at this time.
At this point I believe I am going to get tranny replaced with one from a junk yard from a donor car with 100000 on it. It was hit at 45deg on the rear bumper, causing left wheel to get fully out of it's place.
The replacement will cost me $170/picked up, with my mechanic charging in the range of $600 to do the swap. Hopefully will get done for slightly under $1k.
Words of wisdom on this plan are appreciated. I don't want to have this tranny rebuilt as this would be too expensive for my car.