I contacted another dealer and the service manager mailed me an extensive drive cycle to perform in which took me a day to complete. They told me it was still learning since the A8 is an adaptive transmission. The A8 in the ZR1 does not have AFM so I drove it for an additional 1100 miles only for the problem to return. Talking to the tech he stated that according to the GM field tech that their were reports of shift and valves solenoid's that were dirty in the valve body's. ![]() The dealer checked it and verified my complaint and even though it already had the new fluid they did the triple flush bulletin 18-NA-355 and told me to drive it for 700 miles. Service Bulletin File in Section: - Bulletin No.: 18-NA-091 Date: August, 2018 INFORMATION Subject: Slight Shudder Felt During Gear Shift at Slow Speeds Below 64 km/h (40 mp/h) with Light Throttle Application This bulletin replaces PIP5546C and it should be discarded. Me in the rear and at times 2 to 3 transmission shift flare was so bad I would have to lift the throttle for it to complete the shift all this under normal driving. As to why GM has to differentiate is unknown. 16-NA-335, the second one, covers only vehicles sold in the U.S. The difference is that 16-NA-175, the first one, covers North America, places where N.A. Then 1st to 2nd shift at times was so hard I would look in my rear view mirror to see if someone hit Second, both 16-NA-175 and 16-NA-355 are current bulletins. Special service campaigns are a form of Technical Service Bulletin where a manufacturer will inform dealers of warranty extensions for particular repairs. ![]() Īt about 600 miles the A8 trans started acting up. There have been a few that it did not work for but they may have had. At 500 miles I brought it to the dealer for its first mandatory oil and filter change. The complains have declined much since this came out. According to TSB (Technical Service Bulletin) 18-NA-355, the latest update addresses torque converter clutch (TCC) shudder conditions on 8L45 and. My 2019 ZR1 built date is March of 2019 which I bought new July of that year. 18-NA-177 - RevBase - Chevrolet Bulletin RE: Procedure to confirm that shudder in Chevy Colorados and GMC Canyons is transmission related and if confirmed, directive to effect.
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