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Old 07-19-2011, 08:09 AM
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New tires!

well, guess it's time to change the tag line........and because i know forum rules, pics or it didn't happen, here you go:

before (31-10.50-15)

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during (this shot makes me laugh)

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after!!!!!!!!! (35-12.50-15 on 15x8's)

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Now for the question: My gas mileage unspurprisingly went from 17 to 12 with this new addition. Will regearing help return it to between 15-16? I believe I am running the stock 3.07 gears and should upgrade to 4.56 or 4.88 according to some charts I've seen. At least I'd probably have 5th gear again if I did regear!

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Old 07-19-2011, 08:10 AM
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oh, and fyi - old tires / rims will be for sale for anyone who may be somewhat local to cincy. about 50% tread left on tires.

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Old 07-19-2011, 08:14 AM   #3
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If you have 3.07 gears, I'm assuming you have a rear D35? If so, I wouldnt waste my time regearing something that is bound to break with 35" tires eventually. Swap in a D44 or a ford 8.8 first
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Old 07-19-2011, 09:17 AM   #4
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4.56
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Old 07-19-2011, 09:32 AM
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yeah, i think that is the plan. 4.56. i'm not worried about the axle breaking as i rarely take it off road. thanks jeep in the pool guy! (that was a great story by the way!)
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Old 07-19-2011, 11:43 AM   #6
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I'm running 4.56 gears on 36's and I'm about 18 hwy 14 city.
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93 YJ I6 5spd
My YJ Build +1.5 inch SOA ,37 12.50 15R Swamper M16's, 5.22:1/2.97:1 Stak Tcase with 92 Crawl Ratio--------SOLD...
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Old 07-19-2011, 12:26 PM   #7
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thanks, the wife,,,,not so happy.
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Old 07-19-2011, 02:18 PM
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no i imagine not! mine wouldnt have been smiling either!

wow, 18 highway! 14 city! that would be fantastic.......thanks for the update there......and the hope!
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Old 07-19-2011, 06:20 PM   #9
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Looks great with the new shoes! I love it!

-Travis
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Old 07-19-2011, 06:32 PM   #10
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With big tires comes bigger pain at the gas pump young grasshoppa !
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Old 07-22-2011, 06:15 AM   #11
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I would tend to go with a 4.88, I run 4.88 in mine and 36 iroks, and wish i had just a bit more gear for the road, the wifes is on 33's with 4.88's and she is getting around 24 to 25 on the high way, and runs 70 all day long, super 35 in hers tj 30 super 30 kit, mine ford 8.8 rear 35 spline chromollys, tj 30 front 30 spline chromollys ox locker.
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Old 07-22-2011, 10:24 AM   #12
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wow 25 mpg,,,,
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Old 07-22-2011, 05:25 PM   #13
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Quote:
Originally Posted by tracy
wow 25 mpg,,,,
I think he mean 25 meters/gallon
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Old 07-23-2011, 03:42 AM   #14
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Well the wife just made a trip to the coast 250 miles round trip started with a full tank and took 10.54 gallons comes out to 23.71 MPG. Now most of that is at 55 MPH and hers is a 2.5, cold air intake 4.0 TB, 5 speed 2.5" exh no cat, port injected and recent tune up, 4.88 gears, 33" BFG KM 2's running about 24 PSI. Mine is a 2.5, cold air intake, 4.0 TB new injectors, headers, 2.5" exh no cat, good tune up, 5 speed, 4.88 gears, 36 Iroks, running around 12 psi, and normaly on a road trip runs around 19 or so. It can be done Just have to get them set up right and drive like you want to get good millage.
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Old 07-23-2011, 03:47 AM   #15
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What kind of rims are those in the "Before" pics?
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Old 07-23-2011, 04:02 AM   #16
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there American racing rims, i've seen them on a few yj's i think it was an option from the factory.
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Old 07-23-2011, 12:23 PM   #17
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Thank you. I wonder if they still make them?
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Old 07-23-2011, 01:51 PM   #18
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Don't forget that changing tire sizes alters the accuracy of the speedo... If you go up in size, you are going farther than the odometer is recording.

And my YJ, on 35" MTRs with 4.10 gears was pulling 17 avg. 4.0L, NV4500.
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Old 07-23-2011, 07:22 PM   #19
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my 2 cents....4.88's
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Old 07-24-2011, 04:25 AM   #20
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You are correct they were made by American Racing, over the years i have had two sets one on a jeep 15X10 and another on a Bronco also 15X10, but i dont ever remember them comeing on any of the factory jeeps, it may have been part of a dealer package.
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Old 07-24-2011, 04:30 AM   #21
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You can change the speedometer calibration by adjusting the impulses per revelution, have been doing it on jeeps every sence they came out with the electronic speedo, before that you had to change the speedo drive gears inside the TC, should be one tooth on the cable gear is about 2.5 mph, one tooth on the out put shaft is about 5 mph that is a ball park number as as you go up and down with tooth count it will very some from that, but that is what we have used as a base line, i know over a marked 100 mile section both of our jeeps will be with in about .5 miles of dead on.

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