Malibuair

Mine is 5.3, 6 speed. The tranni reset seemed to do the trick. I bought mine used with about 2k on it. Think the original babied it. I have gone about 30 miles since the reset and it shifts as you would think it should. Positive and predictable! Hope this helps.

So I just went on my first test drive from the fix above. I didn't have any burs or casting flashing but resetting the learn mode on the tranni seemed to fix my shifting problems. I drove it like a race car then back to normal then race car mode then normal. Around town and on the freeway. Maybe a 30 mile loop and it actually shifts great now!! It used to have a weird shudder, seemed to be confused what gear to be in, really hard slamming clunk into 2nd gear up hills, shifting 2 gears when it should only shift 1. I tried really hard to get it to fail and it didn't! Completely different truck!! I do have a check engine light now but, I assume it because the battery was unplugged for over an hour and it will go away. Hope this helps.

It's a 2016 GMC Sierra SLE 1500 Z71 with 20k on it. I guess that a good thing mine looks clean. The bad thing is I guess I still have a shifting problem. I unplugged the battery for over an hour. I did actually smooth all the casting burrs in front of the mass air flow sensor. Figured it might be causing turbulence in the air around the sensor? Frustrating problem! For the most part, I love the truck. Wish you could turn off all the electronics. Even if you turn off traction control and stabilitrack you can still feel the electronics and they it turns back on by itself over like 35mph...sounds like the 10 speed is coming soon. My buddy has a Rapture and the tranni is amazing!

Is this referring to the bur on the actual X or + or the bur around the the outside? On mine the filter side of the x everything looks square and sharp. However there is a bur around the out side ring. Its a molded piece but on the inside it looks welded?

I just bought a 2016 GMC Sierra SLE used with 2,800. My previous truck was a 1999 Chevy LS Z71. 4 transmissions at 280,000. I bought the new one thinking there is no way GM has not fixed that problem...My biggest complaint about the Sierra is electronics. The throttle response is horrible. Sometimes snappy other times it falls on its face. Seems to do exactly what you don't want it to do. Also, when going up a small incline if you're not careful the shift to 1st is horrific. Huge clunk shakes the whole truck. Most shops say it because of modern transmissions. Blaming computers on shifting timing. If you pull the fuse to the stabiltrack it helps. Frustrating, I know it's just a truck but my 99 would smoke my new one 7 out of 10 times. I tried a hyper tech programmer. Didn't change any of the unpredictable lag. Is there a clean way to remove all electronics with a switch on the dash? I know you can pull the fuse (or interrupt the circuit with a switch) to the stabiltrack but it flashes errors on the dash. I'm an electrician so I understand basic circuitry. Is it possible? PS If we are adding switches, what about a switch to lock the locker on the dash?