Gear Ratio & Tire Size Chart

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Dec 6, 2010 | 08:54 PM

jfiedler

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Senior Member

Joined: Nov 2010

Posts: 593

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From: Baltimore MD

Year: 1998

Model: Cherokee

Gear Ratio & Tire Size Chart

Saw this and thought it would be usefull to everyone getting bigger tires to find the right gears if you are looking to regear...dont know if this should be or how to make it a sticky but here it is!!

Also here is the direct link -----> http://www.4lo.com/calc/geartable.htm

Dec 7, 2010 | 07:26 PM

huntingman2706217

MJ>XJ

Joined: Mar 2009

Posts: 17,836

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From: Griffin, G.A.

Year: 1990

Model: Comanche

Engine: 4.0 I6

most dont show the power bands

Sep 24, 2011 | 05:37 PM

black_police_xj

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Joined: Dec 2010

Posts: 111

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From: Ionia, MI

Year: 1997

Model: Cherokee

Engine: 4.0 I6 Power Tech

bump

Sep 24, 2011 | 05:42 PM

ivantheigor

CF Veteran

Joined: Jan 2011

Posts: 1,375

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From: Maine

Year: 2000

Model: Cherokee

Engine: 4.0L I6

So you could go 4.56 gears with 31's... that would be nasty.

Sep 24, 2011 | 09:28 PM

2KXJJEEP

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Joined: Jun 2011

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From: KY

Year: 2000

Model: Cherokee

Engine: 4.0 L6

that chart is based on 65 MPH

Sep 25, 2011 | 01:17 PM

Rock Toy

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Joined: Feb 2010

Posts: 2,095

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From: Cove, OR

Year: 1993

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by xjjeeper

that chart is based on 65 MPH

Yes, but the worst thing about that chart is that it is based on a gear ratio of 1 to 1. So according to that chart, if I didn't understand that it wasn't any good, I would think that my Cherokee with 4.88s and 35s would be turning 3045 rpm at 65 instead of 2419 rpm.

MPH X GEAR RATIO X 336 X HIGHEST TRANSMISSION RATIO / TIRE HEIGHT = RPM

65 x 4.88 x 336 x .79 for manual / 34.8 = 2419

Which is about perfect for that size of tire.

Last edited by Rock Toy; Sep 25, 2011 at 01:22 PM.