RPMs increase when engage Laycock overdrive, hmmm? - The Ford Barn

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RPMs increase when engage Laycock overdrive, hmmm?

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05-24-2020, 04:10 PM	#1
diyforever Junior Member Join Date: Oct 2014 Location: Fallbrook, California Posts: 25	RPMs increase when engage Laycock overdrive, hmmm? It's my understanding that when an overdrive is engaged, the RPMs on the engine should decrease. However, on my 1930 A I have a laycock overdrive and a tach which shows RPMs increase when I engage. The speedometer reading goes up approx 10 mpg which I understand since speedocable is attached to original 3 speed transmission. Anyone shed some light on why engine RPMs increase?

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