Why not just let the ecm shift? You can customize your shift points via a tune. I'd look into a good aftermarket converter honestly... That's going to make way more of a difference.
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2000 Mustang GT Steeda #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.