wlezel

@Pearl2017 thanks for the info. I googled "trans pill flip" and Google pulled up a ton of "transgender" stuff LOL. So, that being said, can you tell me what that means? @ray2005 what was the total cost having it tuned locally? I'm assuming you had to pay $200'ish to unlock the TCM module first + whatever the tuning itself cost?

@High Country 6.2L/8 @Pearl2017 to clarify, are you guys saying Trifecta CAN tune the 2017-2018 8 speed transmission without it being physically unlocked/modified? Everyone swears it can't be done from any tuner without it being modified first. And if so, is it worth it? I'm so sick of my 2017 Sierra with all the 8 speed issues, looking for a resolution.

Can anyone vouch for the Trifecta tune for the 8 speed? It would be worth it to me if it makes the driving experience better. Sure beats buying a new truck. The newest fluid change TSB definitely fixed my shudder issue but the delayed engagement when doing a rolling stop then hitting gas is awful, as well as the clunks.

Hey guys, So I've had my truck for a little over 3 years and it's been nothing but a nightmare with this POS transmission. I went the Diablosport i3 handheld and even custom Lew ECM tune not long after owning the truck and that didn't go well at all, actually made my tranny more clunky for whatever reason (mainly downshifts got worse over stock tuning). I ended up selling the Diablosport and picking up a Range AFM delete device which has served me well. Lew was awesome by the way and very responsive to emails, it's just the ECM tune alone did nothing for me since the Tranny was so bad, and actually made things worse in some respects. My tranny got the awful shudder 3 months ago, and the dealer flushed it with the new TSB fluid which fixed the shudder. It drove overall GREAT for a few weeks (because they reset the TCM memory). However, it's back to complete ****** again. Delayed engagement (worst part), clunky downshift around 20mph, lurching etc... MY QUESTION: Has anyone tried the Trifecta tune on their crappy 8 speed? To my understanding, Trifecta and HPTuners are the only folks who can tune this trans. I'd LOVE to hear some current/recent feedback from anyone on this before I drop $500. At this point, I almost want to get rid of the damn truck, but as a last resort I'm willing to try the tune before dropping some money on a new vehicle due to GM's incompetence Thanks guys!

@SEAN Handyman I have the same truck as you with the same issue (Clunk when coming to a slow stop / AKA 3-1 downshift clunk). @wildlyfe200 Did either of you guys ever get it fixed? I'd love to know!! Thanks!

@mookdoc6 I sent you a PM, please read when you get a moment. Thanks bud!