I have medium to heavy acceleration vibration that occurs @ 20 mph which goes away once the trans shifts into third gear and what feels like out of balance tires/wheels @ 70 mph. It's been in 5 times up to this point without a resolution but the dealer who has very good up to this point will be replacing a major component.
My voltage gauge typically reads a little over 14 volts (14.7) which is what I would expect. The other day I noticed it dropping down to a little over 13 volts. I verified with my Fluke and sure enough 13.5 volts. Is this normal on these trucks? It's usually >14 volts but for some reason I'm seeing it drop down at times.
Mine is in right now for this reason, 2014 Z71, 3.42 rear. I'll let them figure it out but I found in the many posts about this that GM is attempting many things to try to resolve this.
Thanks for this, I thought the same thing as you but was afraid to break something. I pulled it out and black rtv'd the slots on the back side of the rubber holder. I give it 1 week before I spill my coffee in the cup holders!
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