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Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-13-2009
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gear formula

what is the formula for new gears when you get bigger tire size?
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Old 01-13-2009
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What gears do you have and what size tires are you getting?
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Old 01-13-2009
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Name:  gear_ratios.jpg
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Old 01-13-2009
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I like this chart a little better, applies to our trucks better

Name:  Picture1.jpg
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Old 01-13-2009
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i dont want the chart i want the formula i know how to use it i just for get it can i plz have the formula
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Old 01-13-2009
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Quote:
Originally Posted by 04blackedge View Post
I like this chart a little better, applies to our trucks better

http://i188.photobucket.com/albums/z...9/Picture1.jpg
Its the same chart. LOL A couple of the numbers are 1 number off but it is the same thing.
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Old 01-13-2009
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Oh well its easier to see for me, colors stand out more
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Old 01-13-2009
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Quote:
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i dont want the chart i want the formula i know how to use it i just for get it can i plz have the formula
Just cross multiply then

Stock tire size 29 = 4.10s
New tire size 35 = x

35x4.10=143.5
143.5 divided by 29 = 4.94

So the right size would either be 4.88s or 5.13s
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Old 01-13-2009
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thank you i jsut want to run so number and try and figure some things out
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Old 01-13-2009
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that chart is bull**** my tack at 65 is about 1700 with 3.27s and 31s
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Old 01-13-2009
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that chart is bull**** my tack at 65 is about 1700 with 3.27s and 31s
You don't have stock tires. Which means your tac is off. Its not BS.
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Old 01-13-2009
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Charts dead on for me, are you sure you have 3.27s?
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Old 01-13-2009
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Quote:
Originally Posted by 98liftedranger View Post
You don't have stock tires. Which means your tac is off. Its not BS.
that means nothing i have a new speedo gear to make it right all my stuff is correct

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Charts dead on for me, are you sure you have 3.27s?
and yes sadly i have 3.27s gears
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Old 01-13-2009
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that means nothing i have a new speedo gear to make it right all my stuff is correct
You need to have it calibrated. If you haven't then your speedo gear is nothing. And that chart is dead on for me and my 33's and 4.10's.
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Old 01-13-2009
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What does he need to have calibrated? When he changed the speedo gear it fixed everything.
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Old 01-13-2009
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I thought you have to take and X-cal or something to it.

Either way, the chart is not bull****. It is dead on.
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Old 01-13-2009
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my speedo is cable driven not electrical so and im and OBI truck so i couldnt use an x-Cal any way

that chart is wrong when i had 3.27 and 235 tires which is 28.9
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Old 01-13-2009
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Originally Posted by 98liftedranger View Post
I thought you have to take and X-cal or something to it.

Either way, the chart is not bull****. It is dead on.
Naw, his speedo isn't computer controlled.
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Old 01-13-2009
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my speedo is cable driven not electrical so and im and OBI truck so i couldnt use an x-Cal any way

that chart is wrong when i had 3.27 and 235 tires which is 28.9
Oh yeah forgot about being pre 98. Anyway I don't know anyone that has had a problem with this chart.
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Old 01-13-2009
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that chart is based off of 65 mph right?
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Old 01-13-2009
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Yes
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Old 01-13-2009
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But what gear were you in? Are you an auto or manual? Those play a part in this too.
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Old 01-13-2009
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holy crap guys! think before you speak! the chart does not know your overdrive ratio in your trans, it is a generic chart probably using 1:1. you can not figure out the speed or gear ratio the chart is based on without knowing one of those two numbers
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Old 01-13-2009
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I never said if it was right or wrong, I just said it was right for me
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Old 01-13-2009
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im talkin about 5th gear with 3.27 gears and 31s someone explain this chart to me i might understand then
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