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Rear end gear ratio

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Old Jul 18, 2010 | 06:15 PM
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Rear end gear ratio

If i change my rear end from a 3.50 gear ratio to a 2.75 will i be doing lower RPM's?
 
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Old Jul 18, 2010 | 06:28 PM
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300 rpm change for each .25 gear ratio change.- Yes a 2:75 is taller thereby redcing rpm at the same given speed.- estimate approximately a reduction by about 900 rpm
 
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Old Jul 18, 2010 | 07:16 PM
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And the transmission won't be happy, and your gas mileage will suffer because you'll have ZERO power in most any gear and will have to downshift to do anything.
 
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Old Jul 18, 2010 | 10:24 PM
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your speedo will read slower too..........
 
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Old Jul 19, 2010 | 12:05 AM
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You would be able to regain some power by switching to the smallest possible wheel that will still fits the brakes and go with the lowest profile tire you can get to raise your end gearing.

Of course with low pro tires there is a whole other world of issues.
 
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Old Jul 19, 2010 | 12:51 AM
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Originally Posted by Ron/RPMS
your speedo will read slower too..........
that would be the last of his worries if he did such a thing
 
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Old Jul 19, 2010 | 09:38 AM
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And this can't be in the right forum.
 
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Old Jul 19, 2010 | 10:03 AM
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Ford engineers do a lot of work trying to get the best ratios between transmission and universal. IMO, one who lives in the hills or tows should have a 3.73. People looking for max gas mileage might consider a 3.5 or 3.35 but have to understand the truck will be chasing gears as one goes to lower numbers. As mentioned above, can't imagine what a 2.75 would be like.
 
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Old Jul 19, 2010 | 04:46 PM
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Originally Posted by Ford Fx4
that would be the last of his worries if he did such a thing
True but just letting him know the whole picture.............Ron
 
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