nluchau

No check engine light.

Thanks for the reply rlcole321, I am using a range so its kept in V8 the whole time. I get what you are saying about it hanging around that 1k rpm mark and you are correct. Once at that point in 4th or 5th gear and I tip in to accelerate I notice the chuggle. Knock on wood I never felt it so far today yet after filling up with 91 octane. I did clean the throttle body today too. I'll report back if it continues to occur once running 91 through for a while.

I just started noticing this after an 1100 mile trip. A little history: Transmission and Torque Converter replaced at 35k. All updates done. After operating temp is reached on vehicle and from a stop. I accelerate until it hits about 4th or 5th gear (typically 40mph) and then do a tip in of the accelerator to increase speed although I don't want it to upshift. I notice its almost like a misfire or chuggle feeling like its starving for fuel. That is until I kick it down and it upshifts and then it won't do it. Just does it under light throttle tip in. The trans fluid is nice and red, I replaced the air filter and put a bottle of techron in for now and topped it off with 91 octane. It only seems to happen once at operating temp. No check engine light. Just curious if others have experienced this and what the solution was? On that 1100 mile trip I had to fill up a few times using 87 octane since I could not find 89 that I usually use. I am hoping it could be bad gas but not totally sure. Any ideas greatly appreciated.

If it matters any, I just brought my truck in for the same reason. Since new (2016) its at 210 (195 degrees officially). Since last October its been 1 notch below what I call "normal". The service advisor took my truck in and they put the PET scan tool on it and even called up GM. They said it was completely normal and no issues. Well I know my pickup and know it is definitely not normal. I talked to the service manager (who I know quite well). He made a phone call and in moments notice I was in a loaner vehicle for the night and they would have a new thermostat in the next morning. Low and behold I got a phone call the next morning to come get it and its back to normal again. This exact issue is more often than none a thermostat issue if anyone deals with it.

Interesting! Why would they replace the pads then if it doesn't remedy the issue? Note: The pads were on a later revision of the Service Bulletin also.

I had inserts put in about a month ago, noise went away initially but is back now. What gives???? Question, how many new inserts should I have put in? 2 in front and 2 in rear? Are they indeed gray vs black so I can easily tell if I look at the springs?

Same on my 2016 with 41k miles.

I noticed this from day 1 of ownership (New truck). Now I have 39k miles. On my second transmission and it still does it but not as bad. Now I have an abrupt 4-5 shift under slow acceleration. It hits hard at slow throttle but if I'm heavy on the throttle it seems ok. At the moment that is now more irritating to me than the jerky downshifts.

Thanks for the honest feedback on the product. I guess I won't be trying it. Funny thing is though, my downshift jerks aren't random as they occur all the time.

Good question, as far as I know the dealer was only replacing the fluid in the 8 speeds not the 6. If you switch it out on your 6 speed let us know if it works.

I've always wondered about this stuff and had heard good things. I just wanted warranty to work for me but it hasn't. Might be something I need to try.

My lockup isn't harsh or jerky either upon acceleration. The only issue is upon decel when it goes 4-3, 3-2, 2-1. There is a tie up sensation when it downshifts and what I've read and been told is TCC is engaged during decel and at each downshift it unlocks and locks again but yes I do feel the "let go" at almost stopped and it feels like someone bumped into you from behind. If the TCC wasn't locked up during decel I dont think I'd be bringing up this issue but apparently its just how it is. It's really hard for me to acknowledge this I guess.

Mike - Sorry for not seeing this until now. I am certain I feel it locking up while accelerating. Does it feel like some torque is being added somewhat? I wish I could drive it once without it locking just to feel what the downshifts would be like. I'm pretty sure what I am feeling is the TCC unlocking and locking again during downshifts when coasting but its rather harsh and jerky when it occurs. In town driving sucks to say the least. Interstate travel is great of course since it stays in 6th. Wish I knew if this could be resolved or not. It appears not though...

So about 3500 miles ago GM put in a reman transmission as a customer satisfaction for me. I still feel the firm downshifts but not as bad. The one thing I notice now ever since the 2nd transmission is the upshifting seems a bit firm. If its cold and I increase throttle and hit 33mph it abruptly upshifts into 5th gear. 1st - 4th seem fine just when it hits 5 it feels like it drops into 5 vs a slow ease into 5. I'm not heavy on the throttle either. I talked to the service manager right when I first noticed it, a few days after getting it back from repair. He said to give it 3-4k miles and let him know if it still happens as the transmission has a learning curve. One thing I've also noticed is the trans fluid (when checked cold) is way up on the dip stick overfilled. My question is what can the dealer do now with this abrupt upshift into 5. Would a tap reset, or any other reset possibly correct this? Thanks for any info

Funny you mention that: I've noticed if I'm harder on the gas before slowing my downshifts are way more desirable yet almost normal feeling. If I'm easy on the gas the downshifts are harsher when slowing.