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Modified JK Tech Tech related bulletin board forum regarding subjects such as suspension, tires & wheels, steering, bumpers, skid plates, drive train, cages, on-board air and other useful modifications that will help improve the performance and protection of your Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) on the trail.

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Spedometer & odometer

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Old Oct 4, 2012 | 01:04 PM
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Is there gonna be a significant power loss with 35s? Someone tried telling me I'd be 10mph over & that I'd need a torque converter?
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Old Oct 4, 2012 | 01:12 PM
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You'll be about 9-10% off on your speedometer/odometer if you don't change the ECU settings. What year is your Jeep and what gears do you have?
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Old Oct 4, 2012 | 01:24 PM
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Originally Posted by HogHoden
You'll be about 9-10% off on your speedometer/odometer if you don't change the ECU settings. What year is your Jeep and what gears do you have?
2012 & 4.10s
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Old Oct 4, 2012 | 01:31 PM
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With the new 3.6L and 4.10s, you'll have no problem spinning 35's. I have a JKU and 3.73's with an auto. After updating the ECU with a Procal, it drive's almost like stock with 35's.
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Old Oct 4, 2012 | 07:25 PM
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Would you reccomend wheel spacers with 35s?
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Old Oct 4, 2012 | 09:28 PM
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Only if you have a lift or upgraded steering that requires additional backspacing. Or if you like the wide-stance look. My DC2s have 4.5" backspacing which is plenty, but I had wheel spacers for my stock wheels on 32"s after my lift kit.
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Old Oct 5, 2012 | 03:18 AM
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I'm getting a 4" lift with 35s, so do you think I should?
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Old Oct 5, 2012 | 07:48 AM
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If you are putting 35s on stock wheels, you'll need spacers. If you are getting new wheels, get the right backspacing and you wont need them.
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Old Oct 5, 2012 | 07:51 AM
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I'm getting pro comp 7056 I think is the number
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