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Unread 09-14-2012, 02:05 PM   #1
ptrcrynn
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2008 JK Wrangler 
 
Join Date: Aug 2010
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What gear ratio?

Hi, new to the JK ,just got it last night. Still have the YJ. Anyway trying to find out gear ratio can't find a tag on axles anywhere . Wrangler X with auto trans. 08 Thanks in advance. Pat.

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Unread 09-14-2012, 02:31 PM   #2
paul84043
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jack up one wheel. Spin wheel one full rotation, count driveshaft rotations. That's your Ratio....
It will be 3.21:1, 3.73:1, 4.1:1 or deeper depending on if it's been modded. Diff should have a metal tag on it that has the ratio as well, usually inbetween two diff cover bolts.
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Unread 09-14-2012, 02:32 PM   #3
ronjenx
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If it has not been regeared, it has 3.73 gears. No tags on the JK differentials.

You can also get a build sheet, but that will do no good if there is a chance a previous owner regeared it.

So, jack up one front or rear tire, rotate it 2 turns (not 1 like most people say), while you count the drive shaft turns. That number will be your gear ratio.
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Unread 09-14-2012, 02:45 PM   #4
ptrcrynn
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Thanks guys I'll give it a try. It's got some mods so it may have been regeared.
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Unread 09-14-2012, 02:49 PM   #5
paul84043
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Quote:
Originally Posted by ronjenx View Post
If it has not been regeared, it has 3.73 gears. No tags on the JK differentials.

You can also get a build sheet, but that will do no good if there is a chance a previous owner regeared it.

So, jack up one front or rear tire, rotate it 2 turns (not 1 like most people say), while you count the drive shaft turns. That number will be your gear ratio.
Oh, duh....forgot about taking the Diff function into account!!!

Good catch!
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