Posted by Steve@Advance on May 04, 2016 at 13:12:26 from (108.245.66.82):
In Reply to: question posted by Leroy on May 04, 2016 at 10:27:10:
Looking at the numbers, what you see are "3.55 to 1" ratio. What that is saying is for every time the drive shaft turns 3.55 turns, the axle turns 1 turn. So the lower the number, the slower the engine turns.
That, however, does not automatically mean better mileage with a slower turning engine. There are many factors to consider, mainly engine size verses rolling resistance. An overloaded vehicle with a too high gear ratio will get just as bad mileage as an empty vehicle with a too low ratio!
When the factory assigns a particular gear ratio, they go for a happy medium between empty weight and what the vehicle will probably be used for. They also consider engine characteristics, such as power band, torque ratings, emissions, overdrive, locking converter, etc. Throw in years of experience, unlimited funds for research, and a bunch of trial and error. But it's still really a guessing game, especially for trucks, not knowing how it will be loaded or driven.
As others have said, as close as the numbers are, it will be of minimal difference.
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