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2004 to 2008 F-150 and Mark-LT
4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs.


 
 
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Old Tue, November 10th, 2009, 06:11 PM
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Sorry I started to think about something about shift points then realized what you were really asking. The power curve starts to drop after 5000 rpms. Set the max RPM at 5500. I wouldn't go much higher than those due to HP and torque dropoff above 5000 and torque converter ballooning above 5400. The only way around this is to install an aftermarket heavy duty torque convertor. Then you might want upgrade the valve body of the tranny to take on the additional stress because its a weak link also.
A domino effect.
JMHO
Lars
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Last edited by 88Racing; Tue, November 10th, 2009 at 06:32 PM.
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