I've had mine back since getting Bulletin 18-NA-355 performed. My invoice mentions: "torque converter shudder with pico scope 39.4 hz 66 mph 1528 rpmin mode a and shudder not present in mode b". I've put just over 100 miles on it since then and it really does feel like a whole new car now. Shudder is gone and the shifts feel completely different than they did before. Hoping things stay this way for many more miles.
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