My tranny won't shift into overdrive, it shifts fine from 1 to 3, I changed the filter and put Royal Purple in it, anyone got any ideas?
....fourth gear is gone? :icon_frown:
I hope not, but maybe that's what happened?
Did it go into lockup before the oil and filter change?
Not sure what you mean by lockup, but other than shifting a lot smoother now it is the same as before, not going into OD. I was reading in the manual about adjusting the TV cable?
Then I'm affraid you have serious problems. Here's the list of possible causes.
(http://i138.photobucket.com/albums/q276/JimmyTGP/scan0001.jpg)
I would check the control valve.