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Mustang Forums
2011-2014 Mustangs
Driveline/Suspension
4r70w questions/issues
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<blockquote data-quote="Norm Peterson" data-source="post: 16227690" data-attributes="member: 193960"><p>Line pressure in an automatic transmission has nothing to do with the size of any lines attached to it. Line pressure is the pressure inside the valve body in whatever fluid passages are being used to apply clutches and bands.</p><p></p><p>Low line pressure might be the transmission's pump itself, its pressure regulation, or a leak or a missing check ball somewhere in the valve body that's allowing some fluid to bypass what it's supposed to be doing (this can cause line pressure under operation from a good pump to drop).</p><p></p><p></p><p>You need to get that cooler out where it has direct airflow both into and out of, or open up that whole fog light area and add some ducting. Maybe it needs to be bigger, particularly if you're running a torque converter with a higher stall speed than OE. More slip = more heat. Are you also running the oil to water cooler that's in the radiator?</p><p></p><p>That's about all I can offer. Maybe you'll get some more detailed responses.</p><p></p><p></p><p>Norm</p></blockquote><p></p>
[QUOTE="Norm Peterson, post: 16227690, member: 193960"] Line pressure in an automatic transmission has nothing to do with the size of any lines attached to it. Line pressure is the pressure inside the valve body in whatever fluid passages are being used to apply clutches and bands. Low line pressure might be the transmission's pump itself, its pressure regulation, or a leak or a missing check ball somewhere in the valve body that's allowing some fluid to bypass what it's supposed to be doing (this can cause line pressure under operation from a good pump to drop). You need to get that cooler out where it has direct airflow both into and out of, or open up that whole fog light area and add some ducting. Maybe it needs to be bigger, particularly if you're running a torque converter with a higher stall speed than OE. More slip = more heat. Are you also running the oil to water cooler that's in the radiator? That's about all I can offer. Maybe you'll get some more detailed responses. Norm [/QUOTE]
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