General rule of thumb is 10% past the HP peak. So when you shift, you will fall back into your HP range to maximize the area under the curve. So if your peak is at 5200RPM, then you should be shifting a tick over 5700RPM.
Are you going by the dyno chart that Mopar gave you for peak HP? Dyno testing is the best way to determine peak HP and thus optimum shifting points.
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Marc
2003 PT Cruiser GT Turbo, Silver
1985 Dodge Omni GLH Turbo 16V, Black
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