We're with Tom S on this - 5200 until you dyno and know exactly where your peaks are.
Shifting a little low has always seemed like a better idea than shifting a little high.
Unless this is an all-out race car.....
Our mostly-stock SD455 TA ran its' fastest 1/4 mile time when we let it shift at about 46-4700RPMs. It still feels like it's pulling up to about 5,500, but runs the fastest times when we just leave the shifter in 'D'.
Have fun!
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