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 Thanks, @bearded_warrior. 

 

Yeah, it’s most definitely not acceptable for this to be a transmission “update” and still have the same issues the K2 8 speed did. I’m not very satisfied with that, either. Bad QA. 

 

Coming from my 2007 4+OD, the whole thing feels strange to me. Even when it’s running smoothly. Ha! 

 

I do plan to bring the trans up to my dealer in the near future. I’m hoping there’s a more standard fix for it by then. 

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So.. 120 miles since receiving from the dealer with classified "Normal Status".

 

I was out for a drive today, went backing out the driveway, accelerated to 20 mph, hard jolt on the shift (the hardest I have felt at this point) enough for my step-dad and I to start a discussion about the transmission on a 2k mile new truck. Pull up to the stop sign, come to a complete stop and start to lift my foot again to the gas pedal, WHAMMM! Truck slams into gear or something causing the truck to jolt forward about a foot before I put the breaks down hard again.  We had to check the mirrors thinking we just got rear ended or something. Concerning because this could easily cause an accident. 

 

Backed out of my families driveway and went to pull forward on the main road.. accelerated to 20-25 miles an hour. when the truck when to shift to second.  WHAMMMMMMM!!!! The truck slammed into gear or something causing my wife and I to smack our heads against the backrests. It continued to slam through 3rd until we got up to speed.  It was an extreme jolt, similar to feeling rear ended, hands down the hardest hardest shift or whatever it was I'd ever felt in a car. Way worse than the one above. The noise of the slam was so bad it sounded like a backfire or distant gunshot. 

 

Couple notes, both incidents happened after coming to a complete stop before shifting from R -> D.  Both times I had a warm vehicle,  I'd already driven it for 45 min before either incident. 

 

Calling the service department again tomorrow and setting up another appointment.

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Wow, that is alarming. Definitely needs to be seriously addressed by the dealer. 

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3 hours ago, bearded_warrior said:

So.. 120 miles since receiving from the dealer with classified "Normal Status".

 

I was out for a drive today, went backing out the driveway, accelerated to 20 mph, hard jolt on the shift (the hardest I have felt at this point) enough for my step-dad and I to start a discussion about the transmission on a 2k mile new truck. Pull up to the stop sign, come to a complete stop and start to lift my foot again to the gas pedal, WHAMMM! Truck slams into gear or something causing the truck to jolt forward about a foot before I put the breaks down hard again.  We had to check the mirrors thinking we just got rear ended or something. Concerning because this could easily cause an accident. 

 

Backed out of my families driveway and went to pull forward on the main road.. accelerated to 20-25 miles an hour. when the truck when to shift to second.  WHAMMMMMMM!!!! The truck slammed into gear or something causing my wife and I to smack our heads against the backrests. It continued to slam through 3rd until we got up to speed.  It was an extreme jolt, similar to feeling rear ended, hands down the hardest hardest shift or whatever it was I'd ever felt in a car. Way worse than the one above. The noise of the slam was so bad it sounded like a backfire or distant gunshot. 

 

Couple notes, both incidents happened after coming to a complete stop before shifting from R -> D.  Both times I had a warm vehicle,  I'd already driven it for 45 min before either incident. 

 

Calling the service department again tomorrow and setting up another appointment.

You should try to record a video of it doing this stuff. It would be interesting to see it instead of going by a written account.

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I drove a few 8 speed trucks before I got my custom trail boss. They all were nightmare to drive. The slamming downshifts were a huge turnoff.  I drove my 6 speed trail boss and it shifted smooth as butter. Big reason why I bought it. 

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Threw together a quick video from the dash cam. (Pardon my editing skills) 

 

https://youtu.be/JdBlMT7-zfQ - No Audio

 

The videos don't do what you feel in the car justice but it's better than nothing.  Maybe it didn't go forward a full foot at the stop sign since my foot was still on the brake, it was hard to recall since it all happened so quick. It def gave us a smack. 

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Well, she's back in the shop again. Senior customer service escalated for repurchase/buyback which was denied at this time. They want to try to fix it first which is totally fair, discussions of taking it apart and seeing what they can find with the techs, field engineer will come out if needed. 

 

I'll update with the outcome, hopefully we can get something useful.

 

FYI it looks like the Class Action has been updated to include the 2019's if it wasn't already. 

http://gmauthority.com/blog/2019/04/gm-hit-with-class-action-lawsuit-over-alleged-8-speed-transmission-defect/

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Update: Dealership opened up the TAC case today. They were told they are not authorized to do any work to the vehicle unless they themselves can repeat the issues, video or not. Of course they have had no luck repeating, just like last week when it was in there. There are no TSB's open except for the one that states hard shifts from 1-2 is normal while building pressure. 

 

The service advisor is asking if he or the tech can take it home overnight to see if they can repeat anything. I'll be in touch with the Senior Customer Care rep again tomorrow.  FWIW the Customer Care reps seem genuinely concerned about these issues and the experience, hopefully they can override anything preventing them from looking into the transmission. 

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Good to know. Thanks for the updates! Hope the trans can act up for them, so they can see it / feel it first hand. 

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