Alright, I got back from my trip today and my dad told me my transmission wasn't shifting into 3rd gear. I had just gotten my tune in the day before I left, with a lil firmer shifts and raised shiftpoints (to 5900). He drove it a little bit and got on it just a lil from what he said, nothing too crazy.

My dad said initially it was giving him problems on the way into town with the tach kinda jumping and it not feeling right and then on the way home it it went to second and just flew out as it would go into third, but could be brought back down to a lower speed and second would work. Now once it tries to shift into third and flies out of gear it will not even engage second. I have to stop it and let it go to first and shift to second but I have to keep below about 30.

FWIW I tried getting to third in Tow/Haul mode, which the tuner did not touch, but it does the same thing -- flies out at what would be the shift to third.

What are my options here guys? What will a rebuild cost me if I want it to last while handling power and maybe seeing the drag strip once every month or two? Could it not actually need a rebuild, but maybe something minor?

This is a 99 4L60e with 80K, a vette servo and slight tranny tuning.

Thanks!