Figuring Final Gear Ratio?

GRAYPNY · Aug 6, 2007

OK I need some help from you math wizards. I have 255/50-17 tires and wheels. The dia. is 27.03 and if I am running 3:73 gears what is my final gear ratio?

Thanks~

psfracer · Aug 6, 2007

Assuming you had the stock pirelli 235/55/17's, which are listed at 27.1" tall, your final ratio using a 27.03 tire with 3.73's would be little difference: 3.75

Royb · Aug 6, 2007

GRAYPNY said:
OK I need some help from you math wizards. I have 255/50-17 tires and wheels. The dia. is 27.03 and if I am running 3:73 gears what is my final gear ratio?

Thanks~

use this no math required :clap:

http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

Hawgman · Aug 6, 2007

I guess eventually I should make this a sticky so I can quit retyping it.

stock tire height divided by new tire height times gear ratio = actual gear ratio.

So as psfracer stated, assuming your stock tires were 235/55/17s:
27.18 / 27.04 * 3.73 = 3.749

travelers · Aug 7, 2007

Hawgman said:
I guess eventually I should make this a sticky so I can quit retyping it.

stock tire height divided by new tire height times gear ratio = actual gear ratio.

So as psfracer stated, assuming your stock tires were 235/55/17s:
27.18 / 27.04 * 3.73 = 3.749

Yea a stickie might be what the doc ordered. :allhail:

TexasKyle · Aug 7, 2007

Royb said:
use this no math required

http://www.svtoa-atlanta.org/cgi-bin/trans.cgi

Is there a calc for us Auto guys?

MikeVistaBlue06 · Aug 7, 2007

TexasKyle said:
Is there a calc for us Auto guys?

You can do it by hand knowing the transmission gear ratios

See attached photo showing comparison of manual transmissions to automatic transmission.

Mike

Hawgman · Aug 7, 2007

Why would it be any different for an auto? You still have tires, you still have a differential with gears in it...it's gonna be the same.

TexasKyle · Aug 7, 2007

Thanks Mike. Maybe my internet searching sucks, I wasnt able to find anything like that.

Math..that I can do. thanks again.

TexasKyle · Aug 7, 2007

MikeVistaBlue06 said:
You can do it by hand knowing the transmission gear ratios

See attached photo showing comparison of manual transmissions to automatic transmission.

Mike

I was wanting it for general info Hawg. Not just to know final gear ratio. :thumb:

2k05gt · Aug 8, 2007

Hawgman said:
Why would it be any different for an auto? You still have tires, you still have a differential with gears in it...it's gonna be the same.

My Calculator takes all this into account...
Try using my Calculator I created for the S197 stangs..

http://home.comcast.net/~swieduwilt01/Mustang_Calculations.xls

Hawgman said:
I guess eventually I should make this a sticky so I can quit retyping it.

Or you could just use my calculator...

Figuring Final Gear Ratio?

GRAYPNY

Rich

psfracer

billy badass

Royb

Member

Hawgman

THE fucking bad guy

travelers

Senior Member

TexasKyle

D.I.L.L.I.G.A.F

MikeVistaBlue06

Inventor: Asshole Points

Attachments

Hawgman

THE fucking bad guy

TexasKyle

D.I.L.L.I.G.A.F

TexasKyle

D.I.L.L.I.G.A.F

2k05gt

Senior Member

Similar threads

Latest posts

Support us!