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Can anyone tell me how differential ratios work. is this the same as final drive ratio?
what I am wondering is, at say, 65mph which engine would be pulling higher rpms

an engine in a car with a final drive ratio of 3.54 to one, or an engine with in a car with a final drive ratio of 3.36 to one.

The ratio of X to one does this mean X engine rotations to one complete wheel rotation.
 

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> Differential ratio refers to only the gears in the rear end. 3.54 to one being 3.54 rotations of the drive shaft to one rotation of the rear tires.
Final drive ratio is from the engine through the transmission to include the rear end.
Tire circumference will have an effect as well. Tall tires, fast/short tires, quick.
 
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