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Old 09-26-2012, 07:25 PM   #1
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Question When do you NEED a gear change?

IGNORANCE WARNING! I'm new, go easy...

I picked up my brand new 2013 Wrangler Sport today, and it has the upgraded 17" wheels and GY Wrangler tires. I actually think that the tires/wheels that are on my Jeep came off of a Rubicon, or Sahara or something because in the info sheet that my salesman gave me, it has pictures of my Jeep with the original basic small wheels/tires.

Anyway, I was talking with a friend of mine, who has owned multiple Jeeps and he said that might be a bad thing. He said that if the Jeep didn't have its gears changed that I would never make it past 70mph. He also said it was going to cost me $900. (He also drives a $50K monster morphed JKU)

Now I drove it to work today at 70mph and it did fine. I would assume that Jeep wouldn't put anything stock on Jeeps that would be detrimental in the long run.

My question(s) is/are - how can I check to see what gears are in there (I assume the basic ones are)? And, if they did upgrade my wheels, am I running the risk of long term damage? And lastly, if I decide to put on some larger "grippier" tires, how much larger can I go before I put a strain on my transmission?

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Old 09-26-2012, 07:32 PM   #2
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Quote:
Originally Posted by PhotoWrangler
IGNORANCE WARNING! I'm new, go easy...

I picked up my brand new 2013 Wrangler Sport today, and it has the upgraded 17" wheels and GY Wrangler tires. I actually think that the tires/wheels that are on my Jeep came off of a Rubicon, or Sahara or something because in the info sheet that my salesman gave me, it has pictures of my Jeep with the original basic small wheels/tires.

Anyway, I was talking with a friend of mine, who has owned multiple Jeeps and he said that might be a bad thing. He said that if the Jeep didn't have its gears changed that I would never make it past 70mph. He also said it was going to cost me $900. (He also drives a $50K monster morphed JKU)

Now I drove it to work today at 70mph and it did fine. I would assume that Jeep wouldn't put anything stock on Jeeps that would be detrimental in the long run.

My question(s) is/are - how can I check to see what gears are in there (I assume the basic ones are)? And, if they did upgrade my wheels, am I running the risk of long term damage? And lastly, if I decide to put on some larger "grippier" tires, how much larger can I go before I put a strain on my transmission?
It will say it on that same info sheet.

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Old 09-26-2012, 07:33 PM   #3
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Mine was right on the window sticker, from the dealer.
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Old 09-26-2012, 07:38 PM   #4
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Originally Posted by watson View Post
It will say it on that same info sheet.
I don't have the original window sticker sheet.

This is what they emailed me last night.
Houston, TX 2013 Jeep Wrangler WRANGLER X New SUV Spring, TX Sugar Land, TX River Oaks Chrysler Jeep Dodge Ram


We didn't have the 'normal' car buying experience this go round. I had preapproval from my credit union, so we didn't do the normal pricing song and dance. My partner found this Jeep on Saturday when I was in Little Rock, put a deposit on it so they would hold it, and then I went up there Monday evening after work. I don't think I even looked at the window sticker because this was the only Jeep with these features at this price point.
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Old 09-26-2012, 07:46 PM   #5
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Your friend is most likely thinking of the jeeps built pre 2012. They came under-geared from the factory. When weight was added (think 4 door instead of 2) and larger/heavier tires... the engine struggled. A re-gear helped matters tremendously.

You should be fine. Not only the engine, but the new transmission have helped a lot.
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Old 09-26-2012, 08:20 PM   #6
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Your build sheet shows 3.21 gears. These will be fine with your current set-up. 70 Mph will be no problem. Should you opt for much larger tires later (ie. your friends behemoth) a re-gear maybe in order. But no need to be concerned with your current set-up. Enjoy your Jeep and welcome.
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Old 09-26-2012, 08:22 PM   #7
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How'd you figure that out?

Also, how much bigger can I go with tires before it becomes a problem?
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Old 09-26-2012, 08:40 PM   #8
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Many are running 35s and 3.21s with no issues. It all depends on how it drives to you.
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Old 09-26-2012, 09:09 PM   #9
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Ok thanks. I was just concerned about long term damage.
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Old 09-26-2012, 11:39 PM   #10
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Quote:
Originally Posted by PhotoWrangler View Post
How'd you figure that out?

Also, how much bigger can I go with tires before it becomes a problem?
"Window Sticker" opens up your build sheet. Gears are On the left side, bottom.
There are a bunch of tire/gear threads- just use the search feature under Thread Tools. There are many, many differing opinions on 3.21s and tires. If you don't plan to replace your tires anytime soon don't worry about it and enjoy your Jeep as is.
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Old 09-27-2012, 10:07 AM   #11
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Rubicon tires are BFG KMs so you don't have those. Also your friend sounds like he doesn't know what he is talking about. I bet he paid for all his work on his JK. I had 3.73 on my 08 and did 70mph fine with 35s, my rpm was high but it did 70. Anyway, you probably have 3.21 and will be fine for those oem street tires. People's tolerances for the gearing varies. I tolerated my under gearing on my 35s but some guys hate life with it. I will say 5.13 is a lot better. No need to worry about under gearing causing damage, it won't. It just takes away from the fuel economy and power and virtually render useless your final gear.

I would not suggest 3.21 for 35s even on a 12-13, 4.10 from factory or 4.56 aftermarket.

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Old 09-27-2012, 10:10 AM   #12
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^^^Agree. Your friend is an idiot. If it wouldn't go 70mph on stock tires with 3.21s they wouldn't sell them that way.
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Old 09-27-2012, 10:10 AM   #13
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Those upgraded 17" wheels and tires are standard on the Sport S. (Unless you have the BFG M/T tires...those are from the Rubicon). The Sahara has 18" wheels and tires.

Both the Sport S and Sahara are available with the same 3.21 gears, so you are still running a factory configuration. Plenty of people (including myself) are running heavier wheel/tire setups with those same gears as well. You're fine, you're not compromising anything.

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