Had a 1/10 dose of lubegaurd red not completely changed how my 10r80 was shifting at 18,000 miles, I suspect we would have been forced out of the truck. It was banging out of third and would on occasion get so confused it would give up and slip to neutral. I had to pull off the road, in traffic, more than once. At that time I suspected valve body problems and think I was right.
I’ve had to up the LG dose as it’s gotten a little worse. I’ll be surprised if it makes it to 100k, and it’s had its second fluid change at 65k.
Dealer told me “it’s normal, they all do this.”
I’m past warranty. If the class action lawsuit happens, I may opt to participate in this one (I’ve never opted to participate in one before). Regardless, I’m just going to drive it. When this transmission behaves, it can truly drive like a work of art.
Also, agree with a post above, the GM programming is really good, feels more succinct and well-sorted.
I have a buddy with a 10r80 in his gmc - shrapnel at 118,000 - they have issues too.
It’s really a shame. I’m not sure why they haven’t sorted it out - GM has torque converter issues, ford has VB and CDE drum known issues.