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Unread 02-22-2013, 05:48 AM   #1
KitchenViper
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Gears and tires? 2011 wrangler

I have a 2011 wrangler Mojave with 3.78 gears running stock tires with two inch wheel spacers and flat fenders and no lift. I would like to go with 35 inch tires. I have an AEV Procal to adjust the speedo. Can someone tell me if this will work.

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Unread 02-22-2013, 06:52 AM   #2
xraypat23
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it'll work, but you'll be unhappy with the performance. I've got 4.10's in my 2008 rubicon, and it's a dog with 35's 5.13's are getting installed next week
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Unread 02-22-2013, 06:57 AM   #3
KitchenViper
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Thank you can you tell me how performance is affected?
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Unread 02-22-2013, 07:12 AM   #4
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well, bigger heavier tires, they're harder to turn, and they're a different size. So the motor sees a lower RPM, delivering lower horsepower. My 60mph cruising rpm is around 1400, there's absolutely no power down that low, so the tranny's always hunting for gears. It'll work, but it'll be slow, even after gears, it's still going to be slow, but at least it'll be right around what i was running stock.
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Unread 02-22-2013, 07:26 AM   #5
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Quote:
Originally Posted by xraypat23 View Post
it'll work, but you'll be unhappy with the performance. I've got 4.10's in my 2008 rubicon, and it's a dog with 35's 5.13's are getting installed next week
Why did you choose 5.13's? I thought 4.56 would get you back to "stock" and 4.88's would be slightly too tall and recommended for high altitude and rock crawling.

Edit: nvm, saw that your an auto not manual.
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Unread 02-22-2013, 07:39 AM   #6
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xray is right, the JKU is a heavy brick/w the wrong gear ratios in diffs, even 4.10 gears are WRONG for an auto--OK for a 6-spd

Over the years, the 4.88/5.13 gears have proven to be the best for jeep JKUs used as DD and off-road--4.88 for very light off-road and 5.13 for heavy duty off-road-

Those that use 5.38s should have a Rubi-(me)

You shouldn't doit yourself and the cost for a GOOD suspension shop to doit , is from $1200 to $2500 bucks--

Good luck


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Unread 02-22-2013, 07:49 AM   #7
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Thanks guys
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Unread 02-22-2013, 07:52 AM   #8
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yea, i'm paying $1200 for the gears and labor, got fancy and bought a set of riddlers and lube lockers too. All in all, fluid(enough for the break in, and change after first 500 miles) gears, labor covers, i'm in just under 1500. With an auto, 35's and 5.13's it should be a little peppier than stock.
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Unread 02-22-2013, 08:06 AM   #9
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Now that sounds like a great plan-

Quote:
Originally Posted by xraypat23 View Post
yea, i'm paying $1200 for the gears and labor, got fancy and bought a set of riddlers and lube lockers too. All in all, fluid(enough for the break in, and change after first 500 miles) gears, labor covers, i'm in just under 1500. With an auto, 35's and 5.13's it should be a little peppier than stock.
Just be very easy on speed/temps for the first 20/20/20--mile initial breakins-

Good luck

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Unread 03-08-2013, 09:50 AM   #10
KitchenViper
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Quote:
Originally Posted by xraypat23
it'll work, but you'll be unhappy with the performance. I've got 4.10's in my 2008 rubicon, and it's a dog with 35's 5.13's are getting installed next week
So did you get the 5.13s installed can I ask how it is runnin?
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Unread 03-08-2013, 11:00 AM   #11
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Another vote for 5.13s/35s and the auto with the 3.8 (2007-11). Itís the most popular gears for that combo and for good reason. Thatís what I ran also with my í08 4dr and it worked out great; went from 4.10s to 5.13s.
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Unread 03-10-2013, 04:49 AM   #12
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Ok so if I put on 35's with my stock 3.78 gears it will ride doggish. How about 5.13 gears with stock tires how does that run. I'm just trying to figure out the order I should do these in case I can't afford to do everything at once...... Anyone?
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Unread 03-10-2013, 08:44 AM   #13
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Quote:
Originally Posted by KitchenViper
Ok so if I put on 35's with my stock 3.78 gears it will ride doggish. How about 5.13 gears with stock tires how does that run. I'm just trying to figure out the order I should do these in case I can't afford to do everything at once...... Anyone?
5.13 seems to be the best combination. After 5 years I personally still run 3.73 and 35s with my auto and run the OD off. Unfortunately up here labour alone for a gear change is over 2G, + $700 for gears and instal kits, I'm not willing to spend that kinda coin. I'll live with it. I didn't want worry about putting it all back to stock if I trade in.

To answer you question OD off is the equivalent of 5.13 gears (65mph @ 2600rpm) just run down the highway with your OD off and see how it feels with stock tires.

You will be fine to go with lift and 35s and do gears later if you feel the need.
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Unread 03-10-2013, 05:53 PM   #14
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You can do it either way but for me I would do tires first then gears. If you did gears first then when you add the larger tires later down the road you will feel a power loss. Probably the only time youíll really have a problem with 3.73s and 35s is while on the freeway and hills.

The best way of course is to wait until you can do both at the same time.
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