Thought I would throw this out here and see if anyone has had similar issue.

I have a 04 and after heads and whatnot got it back running like a champ but now it has a weird transmission thing going on, make a trip into town to run some errands, park leave it running and come back out and pulling back into traffic it will hang in first gear and when I lift and get back in it it's like in neutral, the red light on the D by the gear selector goes blank along with the D in the cluster disappears, go to neutral and back to D and all is fine and shifts and acts normal? does not do it every time but noticed it's when I stop for a few min while running and get back underway is when it mostly happens.

Now before its asked, no I have not changed the fluid in a while and I know I am fired for that, doing a filter fluid change next week, but I almost feel it might be an electronic issue?

Anyone have a similar issue?

 

Never seen that, my guess is electronic as well. Perhaps solenoids or TCU. Do you have a code reader that will read trans codes?

 

I have Ultragauge and a basic OBDII reader and an Amigo but I dont think any will pull trans codes? Or am I wrong?

 

Could it be the XYZ switch getting dirty ?

 

I have thought of that as problem too, it crapped out maybe two years ago and I did the pull apart clean and reinstall and has been good since but yes that could be crapping out too.