Quote:
Originally Posted by Budman51
My 2018 1SS (build date 11/17) had it, starting at just under 1200 miles. I had TSB 18-na-355 performed at 1463 miles, now have 1720 miles, and the car is like a whole 'nuther animal. Shifts are quicker, crisper, and more positive. I live in north central Florida, and the GM corporate line is that the old tranny fluid is hydroscopic, and when it starts absorbing moisture that's when the shudder starts. Makes sense since it gets pretty humid here. The new fluid and flush tool was sent to the southeast dealers first as they said that's where more of the shudder issues originate. Keeping my fingers crossed.
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I have about 600 miles since the TSB 18-NA-355 flush and so far so good.