285s or 315s with 4:10 gears? - Page 2 - JeepForum.com
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post #16 of 18 Old 04-18-2014, 11:40 AM
ROCKR8R
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2008 JK Wrangler 
 
Join Date: Sep 2013
Location: Phoenix
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Toyo's are some of the heaviest tires on the market. They are great and strong but heavy.

35's are too much for the 3.8L and 4.10. Optimal is 4.88 with a manual transmission and 5.13 on an automatic. Of course it there are no problems running 35's on stock gearing but since when is losing 6th or OD, losing MPG and losing crawl ok??

I will say this again, typically those that say it is fine, never driven a Jeep with 4.88 or 5.13.

-Dan

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post #17 of 18 Old 04-19-2014, 10:45 AM
Neo1130
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2015 JK Wrangler 
 
Join Date: Jun 2009
Location: Olympia
Posts: 1,253
I am sure mine will be fine when I upgrade to 35's here in the next month or two... I don't drive my Jeep for performance... It IS my DD but I expect the lack of performance on the freeway because Jeeps were not designed for the freeway... I've done 33's on a 2.5L YJ with 4.10's and while it was extremely sluggish, I accepted it for what it was. A lot of people say that a stock 3.8 with stock everything is slow. Mine is fairly quick... By no means like my Porsche but again, I expect and accept it. 4.10's on a 3.8 with 35's are doable for me...
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post #18 of 18 Old 04-20-2014, 08:52 AM
jmb6420
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Join Date: Apr 2011
Location: Tulsa
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I have an 08, manual tranny JK Rubi 4.10 with 285/70-17's. I think it is just fine, there are times when I wish I had regeared, but overall it works well. I wouldn't go any bigger without regearing. Especially if it was a JKU.

Mike
08 Rubicon Red Jeep Club #629

"You can't fix stupid" Ron White

ɹǝʌo ǝɯ dıןɟ 'sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
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