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Old 07-08-2014, 12:13 AM   #1
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Whats the 6th gear supposed to feel like?

Hey jeepers!

I drive a 2013 jk wrangler sport and I don't know what the use if my 6th gear is for! As soon as i hit 60mph on my 5th gear and decide to go to the 6th so I can go faster with less rpm it does the opposite and starts to go slower and need to go back to my 5th hear to reach 70mph..

Can anyone help me out if my gear is damaged or is that's what it supposed to do?

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Old 07-08-2014, 12:25 AM   #2
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Blargh. I just typed out a large response but my internet died.

-Your 6th gear is fine.
-You probably have 3.21 gears in your diffs and your tires look larger than stock.
-Because of your setup (assumption), you're doing lower RPMs in all gears than stock, which means you have less power.
-The lower RPMs mean that the acceptable range for your 6th gear may be outside of your typical cruising speed.

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Old 07-08-2014, 12:35 AM   #3
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I forgot to mention I have 33" tires with a 2.5" lift... It came like that from the dealership. So then they might have not done any changes to my gears?
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Old 07-08-2014, 12:38 AM   #4
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Old 07-08-2014, 12:40 AM   #5
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When your JK is geared correctly for the tire size, it is supposed to feel and act similarly to the every other gear. The caveat is that it is a tall gear designed to keep you RPM lower when you cruise at highway speeds to reduce fuel consumption. The problem is your gears are so tall it renders that gear useless because the engine doesn't have enough torque at that RPM to sustain your cruise speed.
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Old 07-08-2014, 12:41 AM   #6
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I forgot to mention I have 33" tires with a 2.5" lift... It came like that from the dealership. So then they might have not done any changes to my gears?
I'm assuming you have a sport with 33". Your sport most likely came with 3.21 gears. These are designed for the 29" tires that come on a base sport. When you up the tires, you are reducing your mechanical advantage. You are seeing this mainly in 6th because it's an overdrive gear. This also means your jeep will be slower to get moving.

Take a look at this chart and check the gear ratio versus tire size. The green is meant to give you an idea of an acceptable ratio. I believe this is the RPM @ 70mph.

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Old 07-08-2014, 12:42 AM   #7
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Nice looking jeep! You can tell the gear ratio by looking at your window sticker.
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Old 07-08-2014, 12:57 AM   #8
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So then the 6th gear isn't meant to increase my speed but make my rpm lower and improve gas mileage?

So if I want to go 70-80 mph (highway) I need to stay on my 5th gear?
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Old 07-08-2014, 12:58 AM   #9
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Originally Posted by Blastek View Post
Nice looking jeep! You can tell the gear ratio by looking at your window sticker.
Thanks man, Ive had for a year now and well it's time to put parts into it and make it stand out now. I'm new at doing this transformation. I've never actually been hands on with a vehicle until now.
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Old 07-08-2014, 01:08 AM   #10
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So then the 6th gear isn't meant to increase my speed but make my rpm lower and improve gas mileage?

So if I want to go 70-80 mph (highway) I need to stay on my 5th gear?
Yep. 6th is primarily meant to reduce your RPM at cruising speed so that you consume less fuel. If you can't maintain your RPM, then you should use 5th. You may want to consider regearing in the future. Just be aware that it's pretty expensive.
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Old 07-08-2014, 01:19 AM   #11
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There are quite a few gearing threads here. Many people report that 6th is usually out if the question when larger tires are put on a 3.21 geared Jeep especially when you get into the higher altitudes and hills. It doesn't hurt any thing just drive it like a 5 speed. As you add more weight and want more low end power, then a re gear will put you back you where you want to be. 3.73 on 33's will do fine but if I were spending money on any gears I would go ahead and 4.11 or 4.56. Either of the last two will have you in 6th much easier and more often.
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Old 07-08-2014, 01:22 AM   #12
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Originally Posted by Blastek View Post
Yep. 6th is primarily meant to reduce your RPM at cruising speed so that you consume less fuel. If you can't maintain your RPM, then you should use 5th. You may want to consider regearing in the future. Just be aware that it's pretty expensive.
Thanks for the help, I much appreciate it! So is there a way to check what gear ratio I'm at right now?
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Old 07-08-2014, 01:26 AM   #13
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Originally Posted by Smitty4x4 View Post
There are quite a few gearing threads here. Many people report that 6th is usually out if the question when larger tires are put on a 3.21 geared Jeep especially when you get into the higher altitudes and hills. It doesn't hurt any thing just drive it like a 5 speed. As you add more weight and want more low end power, then a re gear will put you back you where you want to be. 3.73 on 33's will do fine but if I were spending money on any gears I would go ahead and 4.11 or 4.56. Either of the last two will have you in 6th much easier and more often.
I'll probably end up doing a 4.1 due to going to 35" tires later and I don't think I'll go any bigger. It's my first time driving standard as well so I don't know how that 6th hear is supposed to feel. How much does it cost to have my gear ratio changed?
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Old 07-08-2014, 01:34 AM   #14
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It usually runs $600-1000 per axle. If you ever want to go to 35's I would recommend 4.56. I am currently on stock Sahara wheels with 3.73's. I am going to install 4.56 to run 33's because i tow a lot. This will also allow me to run 35's comfortably if I choose to later on. A re gear is something that most people only want to do once.
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Old 07-08-2014, 01:36 AM   #15
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Originally Posted by Leftystud View Post
I'll probably end up doing a 4.1 due to going to 35" tires later and I don't think I'll go any bigger. It's my first time driving standard as well so I don't know how that 6th hear is supposed to feel. How much does it cost to have my gear ratio changed?
I hear it's 1-2k. You most likely have 3.21s if you have a Sport and you do not have the Max Tow package.

The gear ratio is listed on your build sheet (window sticker when you bought it) as Rear Axle Ratio. If you don't have your window sticker, you can contact jeep with your VIN and get it:
Email Jeep

While you're at it, if you don't have the full 500 page owner's manual, you can ask for that too and they'll ship it to you free if you're the original owner.
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Old 07-08-2014, 05:27 AM   #16
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You can go to the dealer and they know exactly what your specific vehicle has just by looking up your VIN....Or like someone else said, it may be on your window sticker.
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Old 07-08-2014, 05:57 AM   #17
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Just called today for a quote on my 2014 for 4.56 it was $1800
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Old 07-08-2014, 06:10 AM   #18
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Just called today for a quote on my 2014 for 4.56 it was $1800
That's what I paid. Worth every penny.
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Old 07-08-2014, 06:27 AM   #19
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Quote:
Originally Posted by Leftystud View Post
Hey jeepers!

I drive a 2013 jk wrangler sport and I don't know what the use if my 6th gear is for! As soon as i hit 60mph on my 5th gear and decide to go to the 6th so I can go faster with less rpm it does the opposite and starts to go slower and need to go back to my 5th hear to reach 70mph..

Can anyone help me out if my gear is damaged or is that's what it supposed to do?
It is not meant for going faster at lower rpm. Its for maintaining speed at lower rpm. It is the manual equivalent of overdrive.
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Old 07-08-2014, 06:32 AM   #20
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overdrive.
This ^^
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Old 07-08-2014, 07:36 AM   #21
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Thanks guys for your help! I really appreciate this community!
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Old 07-08-2014, 07:46 AM   #22
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I have no 5th or 6th. I can cruise on highways at 65 mph in 4th at about 2600 rpms would I have 3.21 or 3.73 gears. I have stock 32's. Im looking to move up to 33's and probably go with 4.56s.
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Old 07-08-2014, 12:57 PM   #23
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Originally Posted by Trendsetter75 View Post
I have no 5th or 6th. I can cruise on highways at 65 mph in 4th at about 2600 rpms would I have 3.21 or 3.73 gears. I have stock 32's. Im looking to move up to 33's and probably go with 4.56s.
Are you sure you don't have a seized caliper or something. No matter the model, all stock Wranglers, regardless of gearing, can cruise at highway speed in 5th and 6th. Something is wrong with your Jeep if you have to use 4th at 65 mph with stock wheels and tires.
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Old 07-08-2014, 01:16 PM   #24
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Lefty, check this out for a "gears 101". Regearing Basics

Basically, the 3.21 gears in your axle are really intended for Jeeps with the small 225/75R16 tires (29" in diameter). When you put taller tires on you're pushing the 6th gear RPMs too low and the engine just doesn't make power at that low of a speed. That's why you're slowing down when you're in 6th gear.

I had the 3.21 gears with the stock 255/75R17 tires (32" diameter) and I could really only use 6th gear when I had a tail wind or I was going down hill.

I now have 315/70R17 tires (35" diameter) with 4.56 gears in my axles. That is a pretty darn good combination. I can hold my speed in 6th gear, even in a headwind up hill. 4.10's will be good for 33's. But if you think you're going to go to 35's you should look at 4.56's.
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Old 07-09-2014, 01:22 AM   #25
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Lefty, check this out for a "gears 101". Regearing Basics Basically, the 3.21 gears in your axle are really intended for Jeeps with the small 225/75R16 tires (29" in diameter). When you put taller tires on you're pushing the 6th gear RPMs too low and the engine just doesn't make power at that low of a speed. That's why you're slowing down when you're in 6th gear. I had the 3.21 gears with the stock 255/75R17 tires (32" diameter) and I could really only use 6th gear when I had a tail wind or I was going down hill. I now have 315/70R17 tires (35" diameter) with 4.56 gears in my axles. That is a pretty darn good combination. I can hold my speed in 6th gear, even in a headwind up hill. 4.10's will be good for 33's. But if you think you're going to go to 35's you should look at 4.56's.
Thanks derf! This was really helpful and informative. Looks like I'll be going with 4.56 since I'm going with 35" tires down the road!
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Old 07-09-2014, 08:17 AM   #26
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Originally Posted by Trendsetter75 View Post
I have no 5th or 6th. I can cruise on highways at 65 mph in 4th at about 2600 rpms would I have 3.21 or 3.73 gears. I have stock 32's. Im looking to move up to 33's and probably go with 4.56s.
Yes, with stock tires you shouldn't have a problem. I have 3.73s and 17 inch wheels, stock. At 60 mph in 6th gear I am slightly below 2000 rpm. When I am dead on 2000 rpm I am sitting around 62.5mph.
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Old 07-09-2014, 04:56 PM   #27
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This is all very interesting. I have a 2011 2dr soft top with 3.21s and the dead beat 3.8, upgraded to a set of Rubi takeoff wheels and tires. We took a trip from Lubbock, Texas to Red River, NM. I was able to run 70-75 in 6th gear around 2000 rpms. I found that the Jeep is really happy around 2000 rpms, seems to produce the most efficient power there. We averaged 20-23 mpg on the way up. Coming back I was fighting a head wind and 6th gear was out of the question.

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