Slow shift at wot 2-3
did you have it in OD, 3rd gear , or manually shifting it ?
4l60 likes to be overfilled a bit on fluid and will typically shift better on the 2-3 shift if left in OD
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Get a tune and they can bump up line pressure a bit and pull some torque management out.
A tune does wonders for the tranny.
I ran 13.8 bone stock.
Lt headers, tune and tires 13.2
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