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arpad_m · 07-13-2025, 07:59 PM

The solution was published by GM in 2019, it consists of flushing the transmission with the latest, properly non-hygroscopic Mobil 1 Synthetic LV ATF HP fluid that has been available approximately since March 2019.

If the torque converter clutch isn't too damaged, this will solve the problem; if not, the torque converter needs to be replaced as well. Since the car is out of warranty, I'd try not to drive it much until this is performed, because the service department will charge you a pretty sum in labor hours for the TC replacement.

The related technical service bulletin is 18-NA-355 if you want to read up on the details.

07-13-2025, 07:59 PM	#2
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,301 View My Garage	The solution was published by GM in 2019, it consists of flushing the transmission with the latest, properly non-hygroscopic Mobil 1 Synthetic LV ATF HP fluid that has been available approximately since March 2019. If the torque converter clutch isn't too damaged, this will solve the problem; if not, the torque converter needs to be replaced as well. Since the car is out of warranty, I'd try not to drive it much until this is performed, because the service department will charge you a pretty sum in labor hours for the TC replacement. The related technical service bulletin is 18-NA-355 if you want to read up on the details. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle Terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18