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Tranny shifting a little hard

6FOOT6Chevy

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6FOOT6Chevy Enthusiast

6FOOT6Chevy

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So I've had my truck now for 2-3 months and it is now sitting at 3295 miles and every now and then it shifts hard or sloppy but i can make it shift hard by flooring it which obviously happens when doing this but the weird part is not flooring it is when i let off the gas and when i come to a stop the downshifts are harsh. Now i know i could be breaking it in but even my father who used it for a week said it should be checked out and he is quite the Chevy enthusiast himself. Is there any known problems with the 6 speed in my truck? its a 2018  double cab lt z71 4x4 with the 5.3l. 

 

-edit: it also shifts hard when using manual mode or low whatever you like to call it just putting it out there.

adamj2121 Enthusiast

adamj2121

Posted
Posted

I have had the same issues with my truck. I had it at the dealer for the better part of a year off and on. It has not been fixed and everything is "within spec" and "working as designed" according to the dealership and GM's field engineers.

 

I just purchased a Black Bear tune for the truck and it has helped with the issues significantly. I wouldn't say the shifting is completely fixed, but it is probably 98% fixed. If I can figure out how to describe the issues I'm still having I'll contact Black Bear and have them adjust the tune. But after months of dealing with GM, I realized I would not be making any progress with them on resolving my issues.

 

If you can get the dealership to check out the truck and they find an issue I would be very curious to see what they say.

6FOOT6Chevy Enthusiast

6FOOT6Chevy

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On 7/10/2018 at 3:58 PM, adamj2121 said:

I have had the same issues with my truck. I had it at the dealer for the better part of a year off and on. It has not been fixed and everything is "within spec" and "working as designed" according to the dealership and GM's field engineers.

 

I just purchased a Black Bear tune for the truck and it has helped with the issues significantly. I wouldn't say the shifting is completely fixed, but it is probably 98% fixed. If I can figure out how to describe the issues I'm still having I'll contact Black Bear and have them adjust the tune. But after months of dealing with GM, I realized I would not be making any progress with them on resolving my issues.

 

If you can get the dealership to check out the truck and they find an issue I would be very curious to see what they say.

Thanks man for the input. But do you know if the tune voids any warranties?

BlackBearPerf Enthusiast

BlackBearPerf

Posted
Posted
On 7/10/2018 at 12:58 PM, adamj2121 said:

I have had the same issues with my truck. I had it at the dealer for the better part of a year off and on. It has not been fixed and everything is "within spec" and "working as designed" according to the dealership and GM's field engineers.

 

I just purchased a Black Bear tune for the truck and it has helped with the issues significantly. I wouldn't say the shifting is completely fixed, but it is probably 98% fixed. If I can figure out how to describe the issues I'm still having I'll contact Black Bear and have them adjust the tune. But after months of dealing with GM, I realized I would not be making any progress with them on resolving my issues.

 

If you can get the dealership to check out the truck and they find an issue I would be very curious to see what they say.

If you haven't already, shoot us an email, we would be happy to help. 

16 hours ago, 6FOOT6Chevy said:

Thanks man for the input. But do you know if the tune voids any warranties?

We utilize multiple methods to ensure that there is no trace of the tune on the ECM and to date, have had no warranty issues with any customer that has appropriately utilized our service. 

adamj2121 Enthusiast

adamj2121

Posted
Posted
3 hours ago, BlackBearPerf said:

If you haven't already, shoot us an email, we would be happy to help. 

Thanks, just sent an email a little bit ago.

After driving some more I don't believe the issue is in the shifting, but in the throttle response. The trans seems to be shifting even better than the first day I installed the tune, very satisfied with the results. 

nluchau Enthusiast

nluchau

Posted
Posted
On 7/10/2018 at 12:56 PM, 6FOOT6Chevy said:

So I've had my truck now for 2-3 months and it is now sitting at 3295 miles and every now and then it shifts hard or sloppy but i can make it shift hard by flooring it which obviously happens when doing this but the weird part is not flooring it is when i let off the gas and when i come to a stop the downshifts are harsh. Now i know i could be breaking it in but even my father who used it for a week said it should be checked out and he is quite the Chevy enthusiast himself. Is there any known problems with the 6 speed in my truck? its a 2018  double cab lt z71 4x4 with the 5.3l. 

 

-edit: it also shifts hard when using manual mode or low whatever you like to call it just putting it out there.

I have a 2016 (bought new) that has the same harsh downshifts when stopping.  Been to the dealer multiple times, had the valve body and tcm replaced and its still happening.  All current computer updates.  I have 24k now.  I have driven multiple other vehicles that have the 5.3 with 6 speed and they seem to exhibit the same.  I drove a 2018 Suburban, 2017 Silverado, 2018 Sierra, all have the harsh bumps when downshifting coming to a stop.  If you figure something out please let me know.  

 

gtbigup01 Enthusiast

gtbigup01

Posted
Posted
On 7/10/2018 at 2:58 PM, adamj2121 said:

I have had the same issues with my truck. I had it at the dealer for the better part of a year off and on. It has not been fixed and everything is "within spec" and "working as designed" according to the dealership and GM's field engineers.

 

I just purchased a Black Bear tune for the truck and it has helped with the issues significantly. I wouldn't say the shifting is completely fixed, but it is probably 98% fixed. If I can figure out how to describe the issues I'm still having I'll contact Black Bear and have them adjust the tune. But after months of dealing with GM, I realized I would not be making any progress with them on resolving my issues.

 

If you can get the dealership to check out the truck and they find an issue I would be very curious to see what they say.

What year and transmission is in your truck? Blackbear specifically said that they are Unable to unlock the 8 Speed transmission module so not sure how the tune you got helped your shifting issue,  unless you have a 6 speed.

adamj2121 Enthusiast

adamj2121

Posted
Posted
11 hours ago, gtbigup01 said:

What year and transmission is in your truck? Blackbear specifically said that they are Unable to unlock the 8 Speed transmission module so not sure how the tune you got helped your shifting issue,  unless you have a 6 speed.

It is a 16 with a 6 speed. I believe HP tuners can be used to tune the 8 speeds, but you have to remove the TCM and send it in to a tuner or find somewhere and dyno tune it.

 

The OP also has a 6 speed, so his can be tuned as well.

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