Bangs into gear/delayed transmission engagement

[Morenar]

On 12/29/2018 at 7:16 PM, jjcamper said:

I'm having a problem with my 2016 Silverado 4x4 with a locking differential and 4.3 V6 engine. Not sure if it's the transmission or the locking differential but sometimes when I shift from park to drive or reverse to drive and start to take off the engine will rev like it's in neutral and then bang into gear. Has anyone had this problem or have an idea what's going on?

JJCamper, I don't have a 4x4 but I do have a Sierra v6 that had similar issue. See here what the dealer found after I was told previously that it was normal operation. I also noticed it was worse when the transmission got up to temp.

 

 

Oh, forgot to add hen shortly after the above work was done around 600 miles started doing the hard downshifts again and they found quote " Found several valves in the valve body scored due to metal in transmission at last repair of torque converter failure. This is causing valves to bind and stick intermittently when hot." They had to replace the upper and lower valve body assembly. You think they would have flushed the transmission after the first repair a few times. 

Edited January 10, 2019 by Morenar
Added comments

[jjcamper]

I am hoping that mine is not that serious but they won't even acknowledge that there is a problem. My truck shifts ok it's just the problem on takeoff.  

[Plumber101010]

On 12/29/2018 at 7:47 PM, SS502 said:

Lots of discussion, check out this thread:

 

I just posted a thread about this same issue but I don’t see where this link / video you said included a lot of discussion about it is relevant to the issue the OP stated,  which is identical to mine?  Do you have the correct link? Thanks

[Raj Patel]

My 2016 and 2017 Suburbans both have the bang / neutral slam issue also.

[ForensicEngineer]

These gm 6-speeds eat torque converters and often ruin the transmission in the process. Our 2017 suburban with the 6 speed is having the same problem at only 93k miles! Our 2009 tahoe with the same transmission also had the same torque converter failure at 107k miles. Neither was used for any significant towing. GM really screwed the pooch with the tuning on these transmissions; they burn up the torque converters with the constant locking and unlocking of the clutch and partially engaging... and getting tons of wear in an attempt to get a slightly smoother shift and a tiny fraction of a mpg better. They have known a long time they have a problem with these torque converters getting burned up, but in 10 years they have only made the problem worse with more TCC cycling. The 2017 burban unlocks the torque converter every time the thing goes into V4 mode, so every little change in engine load on the highway like a small hill results in more torque converter cycling... Hate to say it but this is likely the last time I will purchase another GM truck/suv. Sick and tired of expensive, premature transmission failures. I work in an industry we all have full size trucks and we rack up miles quickly on the road. The Nissans, Fords, and Toyotas are all getting 250k+ miles without major work on their drive trains, but ALL of our Chevrolet and GMC guys are all having major transmission problems either from day 1 (8-speed) or the torque converter burning up and causing the rest of the transmission to be ruined in the process (6-speed). As a mechanical engineer myself, this is simply a disgrace of engineering and quality control, and makes our group of engineers still driving the GM branded trucks look, quite frankly, stupid. I thought (hoped) GM had grown out of their old ways... I'm not so sure anymore.

[damcaat]

Jjcamper, did you ever get a resolution to the harsh/delayed shift into drive?

[chiri]

On 4/2/2021 at 9:19 AM, damcaat said:

Jjcamper, did you ever get a resolution to the harsh/delayed shift into drive?

I know this is old but having the same problem, did you get any info on this issue?