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Hey there have finally started to tune the turbo v6 with a shift kitted 4l60e now im pretty sure the bands must be wrecked but wondered if there's a way to know for certain it isn't just a solenoid. I have looked into the quad driver 2 fault and from what I've read it was normal.
Also its running the xu6 base tune.
B.t.w I hope this is the correct category for this question.

Up the line pressure work for me stoped my box from slipping and now changes under full boost would not change at all before