Factory Settings Throw Off - JeepForum.com
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post #1 of 2 Old 11-23-2007, 11:29 AM Thread Starter
rock licker
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1999 TJ Wrangler 
Join Date: Nov 2007
Location: South Dakota
Posts: 2
Factory Settings Throw Off

I just bought my first jeep! '99 Sahara, manual shift mostly all stock from what I can see. I live in some pretty rough country (badlands of SD) and want to put some 31's possibly and a 1 or 2 inch lift. The guy at the tire store said to "not mess with the stock set up because it will throw off the computer, the factory ride, the gears, the speedometer, lose power". Now I'm all confussed because I see almost every jeep lifted with big tires! Are all those jeeps messed up or was the tire guy just "one of those guys"?
I don't want to lose all that or have to get into changing everything just for the few changes I want.... will I have to do all that?
Any help would be great.

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post #2 of 2 Old 11-23-2007, 12:45 PM
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1999 XJ Cherokee 
Join Date: Jan 2007
Location: Northern California
Posts: 6,752
as for computers i wouldnt worry too much about that.

but putting bigger tires will throw off the spedo, if thats a big deal to you then you can easily fit it by throwing in a new spedo gear. the gear ratio will be a little off causing a slight loss of MPG and you will have a slight loss of power all as a result to the larger tires. now is this a big deal? i run 31's and none of the above mentioned are a problem to me so i would go ahead with it especially if its going to help with the terrain that you are frequent to.


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