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I would like to address the issue of the hesitation/shudder at the high end of gear changes. Don’t look this up in the dictionary but GM has deemed this issue as chuggling. I have dealt with this issue of the vehicle not performing as intended since the day of purchase in January. I had the transmission reprogramed but within a few days it went back to the chuggling. I have driven 6 different trucks in GMC and Chevy with the same drive train and they all do it. They finally replaced the torque converter back in November and it did resolve about 70% of the problem but it is still their when going up long slow hill grades. GM has no fix for this issue so you better get used to it or sell it.
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Sounds like an aggressive shift schedule to gain the best EPA fuel economy at the expense of driveability.
I have a 2016 6.0L 6-speed 3/4 ton Express van with 12k miles and no problems with the shift schedule.
A locked torque converter at too low of a speed will cause a shutter. Have you tried the TOW/HAUL button. I have one that comes with the towing package and changes to a less aggressive shift schedule. BTW – the harsh shift will not damage the transmission but it is annoying!! They may not have many options as any change must be submitted to the Feds as it will affect fuel economy. Thus it will need new data to be submitted and be approved by the EPA before a service bulletin with a new shift schedule can be put out. n– PS: I am a retired CERT/FE Engineer. -
Wow, thanks for the info. My 5.3 6 speed is doing the same thing. Shame my Chevy dealer here in Baltimore won’t own up to it. Keeps lying that Chevrolet doesn’t know anything about it. Refuses to address. I am planning on buying a new Stingray in the Spring. Won’t be from this same dealer. Lost my business & my family’s business.
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