2012 LTZ falls on its face...

[ILSMKU]

There is a programming update called a VCI (or VIC). If you alter the wheels on a late production 2012+ vehicle, it will effect the way the vehicle shifts. GM has a download that would need to be done and I believe they charge about $45-60 for this.

That is problem #1. Problem #2 is you really should tune that vehicle to get it to run optimally, as indicated by JennaBear. I just said get a Blackbear Tune because that is what I, and 90% of the GM world, use to make their vehicles run like they should.

Hmm, good to know! I will ask my dealer how much to have this done. I do like the idea of the tune and getting ride of 4 cylinder mode too though.

EDIT:

Thank you. I called my dealership and it appear I do NOT have that update. they want 120 bucks + to do it, telling me it will take 1.5+hours to do.

I asked him about the tranny shifting so funky and he flat out told me, he knows it sucks and that I should get a hand held programmer.... LOL! He actually told me that. When I asked him, wont I void my warranty doing that? He said, to uninstall it before I come in, and that only SOME still get flagged after they are uninstalled. He didnt know which ones WONT get caught, but he said they are out there.

Rather than spend 120+ just for tire programming, i think I will spend my money on the turn and tire programming from BB instead.

Now i need to find an exhaust and some a drop kit (wife is begging me for a drop and exhaust).

Thank you and everyone else for the help so far.

What octane are you running?

91?

---------- Post added at 02:32 PM ---------- Previous post was at 02:20 PM ----------

 

[THE YETI]

no problem Don, glad it helped you out.

:shake:

 

[Jmat]

"Now i need to find an exhaust and some a drop kit (wife is begging me for a drop and exhaust)."

Wow man... that's one cool wife you've got there! Maybe she'd appreciate a supercharger as anniversary gift? BTW, go with the BB tune, you won't be dissapointed.

 

[ILSMKU]

"Now i need to find an exhaust and some a drop kit (wife is begging me for a drop and exhaust)."

Wow man... that's one cool wife you've got there! Maybe she'd appreciate a supercharger as anniversary gift? BTW, go with the BB tune, you won't be dissapointed.

Thanks man! No SC for her. She won't let me get one for my ride!!!

 

[KMeloney]

Jenna -- You guys going to be in the Philly area anytime in the near future? (I'd go to central NJ, too, or down to Baltimore...)

Yes, I'm running a tune, but would like to see if it could be optimized via an in-truck session.

 

[JennaBear]

Closest will be DC in Oct.

 

[KMeloney]

Closest will be DC in Oct.

Thanks.

 

[imi4tth3w]

just fyi there is no point in running premium in your vehicle if its not tuned for it.

also the way you explained your symptoms, it almost sounds like the trans is slipping? or maybe the cai is leaking causing irregular revs? anyhow i'd just double check your trans fluid and your intake install make sure everything is good.

reguardless, a tune is going to help everything all around. just some things i thought i'd point out.

 

[Zed 71]

also the way you explained your symptoms, it almost sounds like the trans is slipping? or maybe the cai is leaking causing irregular revs? anyhow i'd just double check your trans fluid and your intake install make sure everything is good.

That is how the 6-speed tranny feels and it is a common complaint.

 

[ILSMKU]

UPDATE:

I installed the Borla catback system and it made a pretty big difference in regards to throttle response. It has ZERO drone and its not loud at all. We are kind of bummed its not louder to be honest. I know it will get a little louder, but even then, I dont think it will be as loud as we hoped.

Im still not happy with how it shifts though. I think my big 24" wheels are just making an already funky transmission even worse.

Black Bear... Im ready for a tune and tire size reprogram or whatever my truck needs.