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I plan on getting a lift and putting on some 265/75/17 tires, I went to the tire calculator posted by Phunkeydude, and the tires would put a 10% difference on my speedometer, if that is true, can it easily be adjusted and is it expensive.
 

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Here are the tire sizes that can be reset by the dealer with the Starscan tool. Otherwise you will need a calibration tool from Hypertech (http://209.12.144.2/Products/Speedometer%20Calibrator) or AEV (http://www.aev-conversions.com/products/modules/).

235/65/17 Wrangler HP
235/65/17 Eagle LS
245/65/17 Wrangler SRA
245/65/17 Wrangler HP
245/65/17 Wrangler AT/R
255/45/20 ZR20 ASP
245/60/18 Wrangler HP AW
245/45/20 ZR20 BSW performance
LT 245/65/17 Wrangler HP
LT 245/65/17 OWL A/T
235/65/17 XL BSW all season
245/65/17 R17 Bsw all season
245/65/17 BSW A/T
235/65/17 SL Wrangler S4
 

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I used the Hypertech tool and it works just fine. The AEV module is only for the 4" lift.
 

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how much did the hypertech cost you.

and where did you get it from. part # please!
Click on the link in my previous post. Then click on where to buy in the list on the left.
 

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Also, I was at the dealer a few weeks back and I asked him about the StarScan tool, and he looked at me like I had two heads - - he said there is another tech that would do that stuff. Gotta love some of these dealers.
 

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I looked it up on autoanything and summit, both quoted at $230 for my 07 3.7l. http://www.autoanything.com/performance-chips/61A3757A0A0.aspx?kc=ffapplist&from_search=1 I'd rather just stick to knowing im going 4 mph faster than my speedo says than shell that much out.
will the hypertech programmer do anything to the shift points in the 3.7? i know that when i'm driving down the freeway with my 255's my jeep more or less likes to stay in the gear just under overdrive unless i'm on a slight downslope. lol is anyone else experiencing this?
 

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I noticed that there were a few tires listed there that are the same size as the stock tires on the commander. Why would you need to re-calibrate the speedometer for that. I realize that not every tire is the exact same size but that would be a waste of time/money IMO.
 

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I looked it up on autoanything and summit, both quoted at $230 for my 07 3.7l. http://www.autoanything.com/performance-chips/61A3757A0A0.aspx?kc=ffapplist&from_search=1 I'd rather just stick to knowing im going 4 mph faster than my speedo says than shell that much out.
Just paid $229 on Amazon for it. I feel it is worth it for two reasons: 1) I'm accurately reflecting my real mileage and 2) My wife could never remember if she was going 4-6 mph slower or faster. It's less than the cost of one ticket.:mofo:
 

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will the hypertech programmer do anything to the shift points in the 3.7? i know that when i'm driving down the freeway with my 255's my jeep more or less likes to stay in the gear just under overdrive unless i'm on a slight downslope. lol is anyone else experiencing this?
I had some weird shift/RPM things going on when I first put the 255/70/17s on but I think the computer adjusted for it. I also got terrible mpg when I first had the new tires on. I am now getting normal mpg. Try disconnecting the battery to reset the shift points.

I think I am going to go with the Hypertech eventually. It is worth the peace of mind when driving on long trips or checking dash lights.
 

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I think I am going to go with the Hypertech eventually. It is worth the peace of mind when driving on long trips or checking dash lights.
There is a Hypertech in the buy/sell section for $200
 

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Here are the tire sizes that can be reset by the dealer with the Starscan tool. Otherwise you will need a calibration tool from Hypertech (http://209.12.144.2/Products/Speedometer%20Calibrator) or AEV (http://www.aev-conversions.com/products/modules/).

235/65/17 Wrangler HP
235/65/17 Eagle LS
245/65/17 Wrangler SRA
245/65/17 Wrangler HP
245/65/17 Wrangler AT/R
255/45/20 ZR20 ASP
245/60/18 Wrangler HP AW
245/45/20 ZR20 BSW performance
LT 245/65/17 Wrangler HP
LT 245/65/17 OWL A/T
235/65/17 XL BSW all season
245/65/17 R17 Bsw all season
245/65/17 BSW A/T
235/65/17 SL Wrangler S4

They can also calibrate for 245/70-17. They just did mine.
 

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They should be able to adjust the speedo for virtually any tire size, they just need to know the revs per mile. That can usually be found on the tire manufacturers website, or you can measure the distance for one revolution and then run the math. ( I usually use at least two revolutions to make it more accurate.)
 

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There is a jeep dealer mechanic on my local jeep club forum and I asked him
his thoughts on the starscan vs hypertech speedo calibration
this is his reply
The Starscan programmer can set the correct tire size but is limited to factory offered choices only. So if you are putting on a tire size that was offered in any Commander we can program your controller. That being said, unless you are going up or down more than 4 sizes, the speedo isn't gonna change much and you can check it very accurately with a handheld gps device.
Not very settling, so I think I may go with the Hypertech
 

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I now am travling 5 MPH faster then what my speedo shows.
 

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I just put on 255/75/17's and haven't had the speedo recalibrated yet. I might wait on that. Like 49er said, I am going faster and am also going further than the odometer figures, so relative to gas mileage, until and unless you get the speedo recalibrated, we are getting better gas mileage than the computer shows. For me, that is about 8-9 percent better than the computer shows.
 
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