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Waltherone
Dodge Dakota
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12/18/2002
19:15:44
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 Subject: Finding actual gear ratio
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Message:
I've heard people say things such as "my gear ratio to the ground is X.XX because of tire size" which makes sense obviously, what I am wondering is, what are they using as a base size to calculate that?
For example, from what I've read on here, stock tire height on an R/T is 28", but is 29" on any other dakotas (non-R/T's). That said, if both have 3.92 gears available, it seems that one of them is actually running on about a 4.XX setup (r/t) or something like a 3.80 setup (non-R/T's) right? So, what tire size gives an actual 3.92 ratio?
I'm asking because I'll be getting the 16" wheels soon and tire options are very limited, I'll end up with a 27" tall tire once I eventually run down the ones that I buy on the wheels, and am just curious what 'actual' gear ratio I'm going to have..
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blueballs
Dodge Dakota
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12/18/2002
22:24:08
| RE: Finding actual gear ratio
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There is a off road shop in houston tx that has a chart they may be a help 1-713-797-9503
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Steve
Dodge Dakota
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12/18/2002
22:26:01
| RE: Finding actual gear ratio
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Take a ride in your truck to ,say, 40 mph. If you have a 5 speed, you want to be in 4th gear (1 to 1 trans ratio). If you have an automatic, you want to lock out the OD and be in high gear. (1 to 1 trans ratio). Record the RPM you are turning.
Multiply the RPM x the tire diameter. Multiply the MPH x 336. Divide the first answer by the second answer. This is your gear ratio.
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POWER HUNGRY
Dodge Dakota
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12/18/2002
22:44:19
|  RE: Finding actual gear ratio
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Message:
Waltherone,
It is really used for comparing the distance traveled per revolution of the driveshaft. Another way of looking at it is that the effective drive ratio (actual term) is what the gearing feels like. A larger tire will reduce the leverage the axle has against the ground making the motor work harder.
The gear ratio itself only means how many times the driveshaft turns per revolution of the axles.
http://www.4lo.com/ is the simplest calculator for finding out the effect a tire change has on the gearing.
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