I have this problem as well... I used to put the car in gear without pusing the clutch in (without the engine running) and thats when it started. I lost 6th gear, and eventually forced it into 6th and got it back. But I also have missed the upshift from 2 to 3rd, and that may have caused it as well. (im not that good of a driver)
I guess ill change my fluid agian- and wait till the thing falls apart, and get a new tranny. AP2 trans with 4.57 or 4.77- that will be fun

 

AP2 transmission + 4.77 is awesome

 

I will be picking up the AP2 next week

 

how much is an ap2 tranny from hardtopguy?

 

pretty sure its 2K