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Unread 04-02-2012, 12:59 PM   #1
limelight76
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2008 JK Wrangler 
 
Join Date: Jul 2010
Location: DC
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Duratrac and upgrade options on a 08 Rubicon AUTO

All,

Its time to change tires, and I would really like to get some Duratracs. I think the biggest size I can put on the stock Rubicon wheels is 285/70R17 given the 7.5" wheel width. Is that correct? That is approx a 33" tire which would require a leveling kit or a 2.5" BB.

I would really like to go with 315/70R17 but I believe that would require a new wheel purchase (8.5"+ wheel width) . But I am on a budget, and since this is an AUTO, 4DR I would like to move up to a 4.88 or 5.13 differential when I get my new tires. I think the 315's would also require the 2.5" lift as I have heard mixed info on here as to whether "there will be rub" with just a leveling kit.

After the tires, I probably don't have money for both wheels and diff upgrade right now. Thoughts on the 285 vs 315 option? Should I go with the 4.88 or 5.13 upgrade?

Cheers!

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Unread 04-02-2012, 01:38 PM   #2
Looney
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2011 WK 
 
Join Date: Jan 2010
Location: Los Angeles
Posts: 199
I would definately say the gears would be a plus if you increase tire size. I had the stock 4.10 and ran 35 inch tires for a couple of years. I drove the jeep for maybe 200 miles before I went overseas and most all my upgrades were done with me gone so I didnt really have a good way to judge any performance lost with new tires. But once I regeared it really did feel like a new jeep. plus i gained 2mpg. Im all the way up to 14, lol

I went with 5.38 gears and now Im running 37 inch tires. I would say the 5.13 would be a good set. Not alot of people say they have too much gear and wish they had less. Both are probably good options but 5.13 would not be extreme.
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Unread 04-02-2012, 01:51 PM   #3
JKDylan
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2012 JK Wrangler 
 
Join Date: Mar 2012
Location: Clovis, NM
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Have you considered dropping the stock wheels and buying 16" wheels? They are cheaper than the 17" wheels and the meats are cheaper for them as well. You might consider getting that set up and the TF leveling kit untill you gather the funds for a real lift if it came down to it.
My best advice for you would to be to call Jason at Krawl Off-Road, he can help you innumerably in your desicion and will definitely find you something that will meet your financial constraints.

Goodyear Duratracs:
315/70R17 - $271/ea at disscount tire (I don't know the KOR price for these
315/75R16 - $262.10 Shipped from KOR (this is what I bought)

Plus, with the 16" wheel route, the actual wheels themselves are cheaper. Like I said, give Jason a shout and he will hook you up with all the knowledge you could ever need.

Also you wouldn't HAVE to regear... that being said, it would be more sluggish and go in and out of OD a lot, and would definitely be more advisable to regear.

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Unread 04-02-2012, 02:29 PM   #4
limelight76
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My only thinking with staying 17" is that it ends up being less unsprung weight when you factor in the total for both tire and wheels..not sure what that actually equates to in fuel efficiency and power.... or whether the difference between 17" or 16" warrants the difference. I would assume there are more wheel options for 17" if I end up changing them out in the future.

Also sounds like there is not much downside to going with 5.13 vs. 4.88 in an AUTO.

Mike
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Unread 04-02-2012, 02:49 PM   #5
jstrubberg
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You should be able to do a 33" tire without any kind of lift or leveling kit. The stock rubi tires are 32". 4.10 gearing is probably acceptable (if only barely) for a 33" tire as well.
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Unread 04-04-2012, 11:18 PM   #6
67alecto
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2007 JK Wrangler 
 
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Quote:
Originally Posted by JKDylan View Post
Have you considered dropping the stock wheels and buying 16" wheels? They are cheaper than the 17" wheels and the meats are cheaper for them as well. You might consider getting that set up and the TF leveling kit untill you gather the funds for a real lift if it came down to it.

That is what I did.
305/70 Goodyear Wrangler Duratracs on 16x8 procomp wheels (already had the teraflex leveling kit)


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Unread 04-05-2012, 10:14 AM   #7
limelight76
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Thanks for the advice. I think I may go the 305/70R16 route with the ProComp 7069 16x8 wheels. It seems like the most cost effective solution to get the ride and look I want with only a leveling kit. I am a little worried about the additional unsprung weight this might have as compared to the 17" wheel option but I am not going to upgrade the differential at this point, so 33" tires with the 4.1 Rubi diff is about as big as I am willing to go.
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budget boost , differential , duratrac , leveling lift , wheel width

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