1996 pcm tcc problem

I'm having sinister performance tune a pcm for my 1996, I'm having them add fuel trim and a couple other tweaks. I wanted to have my torque converter lockup earlier, at 3rd gear maybe. They told me the 1996 pcms have a software malfunction where it won't won't properly, at least that's the case for bonnevilles which they tune alot, he said Riviera might or might not be affected has anyone tried doing a 3rd gear lockup for around town driving?

how much is it for the tune i would like to get one as well, are they located in utah?? I'm still learning about these cars so I'm not sure to the about your question

I paid 150 plus shipping for my tune from sinister performance, Ryan G owns the company awesome guy he was able to program my computer to lockup in 3rd gear, and added fuel trim car feels alot better. I think its 100 for a tune because I paid 50 for a spare computer so I can still drive my car