I just had my 6 speed rebuilt in my 18 premier to the tune of $4500. Heat is the killer of these transmissions. The torque converter goes bad and destroys the transmission. Just be sure to install a lower temp thermostat, like what superior offers, to keep the temps down.
I just had the 6 speed trans rebuilt on my 18 Tahoe at 95k. Had fluid changed twice. From what I heard; the torque converter gives destroying the transmission in the process due to heat. I ended up installing a thermostat bypass, but I guess I was too late.
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