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Unread 06-13-2014, 01:58 PM   #1
luis9798
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1998 TJ Wrangler 
 
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Question About 1998 Sahara Edition

MY Tj has 32x11.5x15 tires and I do not know if it was regeared. So I checked only what the original tire size for saharas was, and the size I found was 225/75r15 tires but the sticker on my door jam says the original size was 205/75r15. Is this normal? Is it a typo? and how can I determine if it has been regeared without opening up the differential.

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Unread 06-13-2014, 02:00 PM   #2
luis9798
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disregard the "only" on the second sentence.
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Unread 06-13-2014, 02:08 PM   #3
Neil F.
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With regards to the tire size, the door sticker only will have the base tire size. Optional sizes will not be on the door. 30" should have been stock on yours You can get a build sheet from chrysler to verify)

The ratio it came with will be on a tage on the front and rear differential.

Jack up the rear and rotate the tire one revolution vs how much the driveshaft rotates.
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Unread 06-13-2014, 02:32 PM   #4
Wheelin98TJ
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Here is a link from the FAQ:

How do I determine my axle gear ratio?
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Unread 06-13-2014, 02:38 PM   #5
luis9798
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I checked out the Tag and the ratio is 3.73. How does the tire size affect the speedometer? Will changing the gears help my mpg? And I have been thinking about upgrading to 33's will the gears still work alright?
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Unread 06-13-2014, 02:48 PM   #6
Neil F.
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Bigger tire size, means you speedometer is reading slow and the miles on the odometer are lower. Changing the speedometer gear will correct them.
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Unread 06-13-2014, 05:28 PM   #7
tyvanwie
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1998 TJ Wrangler 
 
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The gears will still work, the jeep will just be slower. Is the jeep auto? Where any other modifications done besides regear?
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Unread 06-13-2014, 06:49 PM   #8
luis9798
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The Jeep is manual, with a 4 inch lift and I dont think it was regeared when the lift was added.

Will running 32's affect the way the jeep rides in the long term?
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Unread 06-13-2014, 07:14 PM   #9
RksPlz
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I am running that setup exactly with 3.73 gears. I've had the jeep 2 yrs like this and have had no problems. I do have the 4.0 not sure what you have. I can use 5th gear on the freeway just fine and still have plenty of poop for scootin around town. If I had to nit pick, wheelin in rocks can be a bit jumpy but very manageable. In a nutshell very liveable. Hope that helps.
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Unread 06-13-2014, 07:45 PM   #10
Jeeper5
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I have a 99 TJ with the Dana 44, 3.73 gears running 33X12.5 tires on 15X8 rims, Automatic.. No issues. 3.73 still fall into an acceptable range for 33" tires on most gearing charts that I have seen. Upgrading isn't necessary.
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factory , gears , sahara , tires , tj

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