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Ford Raptor Maintenance Forum
Modifying transmission dip stick
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<blockquote data-quote="Jakenbake" data-source="post: 1796578" data-attributes="member: 25145"><p>I went back and looked at my old posts when I installed the Bm dipstick and I couldn’t find the one I was looking for, but I am 90% sure I installed the new dipstick while the truck was cold and the fluid did not run out. </p><p></p><p>ATF has a thermal expansion of like 0.0007% per degree C. 70*F to 200*F is ~72*C so that is .0091Quarts per degree C. So cold to hot would be something like half a quart difference.</p><p></p><p>I don’t know the area of the pan at the level of the dip stick, but I could see half a quart making a difference.</p><p></p><p>Anyways I’m tired, been a long day and my math may be off as I did it on my phone while watching a movie.</p><p></p><p>Long story short. I am pretty sure that engine off with transmission cold will not flow out once you crack open the dip stick. Trans hot with engine off will certainly overflow.</p></blockquote><p></p>
[QUOTE="Jakenbake, post: 1796578, member: 25145"] I went back and looked at my old posts when I installed the Bm dipstick and I couldn’t find the one I was looking for, but I am 90% sure I installed the new dipstick while the truck was cold and the fluid did not run out. ATF has a thermal expansion of like 0.0007% per degree C. 70*F to 200*F is ~72*C so that is .0091Quarts per degree C. So cold to hot would be something like half a quart difference. I don’t know the area of the pan at the level of the dip stick, but I could see half a quart making a difference. Anyways I’m tired, been a long day and my math may be off as I did it on my phone while watching a movie. Long story short. I am pretty sure that engine off with transmission cold will not flow out once you crack open the dip stick. Trans hot with engine off will certainly overflow. [/QUOTE]
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Ford Raptor Forums - General Information
Ford Raptor Maintenance Forum
Modifying transmission dip stick
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