I agree. Though I didn't have any customer service issues, I probably would have if I'd pressed it. I just went out and got a tuner. ZZP has yet to acknowledge that 04+ w-bodies require different trans programming and theirs was killing my 04+ tranny with slippage followed by extremely harsh shifts. I can't imagine trying to tell them to fix it.

I've since gotten the performance out of my tranny I want with my tuner and the help of someone extremely knowledgeable. You know who you are.