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Old 06-13-2014, 10:07 PM   #1
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5.13 gears with 35" tires review

For those of y'all who can't decide whether or not you want to make the plunge into purchasing new gears, I am going to tell you what I've noticed since I got mine done.

I bought G2 5.13 gears about a year after I got my lift and tires. Since I lifted it, I'd say my jeep lost about 30, maybe 40% of it's power. I'm not going to tell you that buying gears fixed that problem completely, but I'll do my best to list the pros and cons through out this post.

Before I lowered my gear ratio, I was running the stock 3.73 ratio and couldn't even keep up with highway traffic. I was forcing 70 mph at about a whopping 4500 rpm. With the new gears, going 70 is a breeze. In fact, going 80 is easy too.

I can't say that I've noticed a direct increase in power in the throttle response, but the most notable difference is after 3rd gear. The jeep has to work a whole lot less to stay at higher speeds. I have noticed that the first two gears are a little rough, but that's not that big of a deal.

Fuel mileage has increased a little bit, but nothing too drastic, so if that's what you have in mind, gears may not be your best bet... Better yet, a jeep isn't at all.

So my suggestion is this: if you have the money, a lower gear ratio to match bigger tires is definitely a good investment.

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Old 06-13-2014, 10:12 PM   #2
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For those of y'all who can't decide whether or not you want to make the plunge into purchasing new gears, I am going to tell you what I've noticed since I got mine done.

I bought G2 5.13 gears about a year after I got my lift and tires. Since I lifted it, I'd say my jeep lost about 30, maybe 40% of it's power. I'm not going to tell you that buying gears fixed that problem completely, but I'll do my best to list the pros and cons through out this post.

Before I lowered my gear ratio, I was running the stock 3.73 ratio and couldn't even keep up with highway traffic. I was forcing 70 mph at about a whopping 4500 rpm. With the new gears, going 70 is a breeze. In fact, going 80 is easy too.

I can't say that I've noticed a direct increase in power in the throttle response, but the most notable difference is after 3rd gear. The jeep has to work a whole lot less to stay at higher speeds. I have noticed that the first two gears are a little rough, but that's not that big of a deal.

Fuel mileage has increased a little bit, but nothing too drastic, so if that's what you have in mind, gears may not be your best bet... Better yet, a jeep isn't at all.

So my suggestion is this: if you have the money, a lower gear ratio to match bigger tires is definitely a good investment.
^^^^ Yup, to all of the above. Running 5.38's with 37's and sometimes wish I could go even deeper!!! But then I don't do much highway driving either.
If you gotta have fuel mileage, you probly bought the wrong vehicle!

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Old 06-13-2014, 10:18 PM   #3
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Before I lowered my gear ratio, I was running the stock 3.73 ratio and couldn't even keep up with highway traffic. I was forcing 70 mph at about a whopping 4500 rpm. With the new gears, going 70 is a breeze. In fact, going 80 is easy too.
Weird. Mine has 35s and 3.73s and I can keep up in traffic just fine. And 70mph is no where close to 4500 rpm for me either.
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Old 06-13-2014, 10:33 PM   #4
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Weird. Mine has 35s and 3.73s and I can keep up in traffic just fine. And 70mph is no where close to 4500 rpm for me either.
yeah, I was told that I had an unusual case, but gears seemed to do the trick!
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Old 06-13-2014, 11:05 PM   #5
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Weird. Mine has 35s and 3.73s and I can keep up in traffic just fine. And 70mph is no where close to 4500 rpm for me either.
I'm the same way. 3.73, 35‘s, 2.5 inch lift and 70 mph is about 2600 rpm. 80 is maybe 2800 which feels uncomfortable for any longer duration. . I plan to change out the gears later in the year to obtain lockers and rid of this feeling.

When you change gears, you have to do front and back at the same time right? I imagine a mismatch would be very bad.

Thanks for providing the review of the gears. Did you replace the shafts at the same time? How many spline did you go with.
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Old 06-13-2014, 11:07 PM   #6
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When you change gears, you have to do front and back at the same time right? I imagine a mismatch would be very bad.
Yeah. Mismatched gears are very bad.
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Old 06-13-2014, 11:10 PM   #7
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I'm the same way. 3.73, 35‘s, 2.5 inch lift and 70 mph is about 2600 rpm. 80 is maybe 2800 which feels uncomfortable for any longer duration. . I plan to change out the gears later in the year to obtain lockers and rid of this feeling. When you change gears, you have to do front and back at the same time right? I imagine a mismatch would be very bad. Thanks for providing the review of the gears. Did you replace the shafts at the same time? How many spline did you go with.
yeah, I didn't have money for lockers, but if you do, it's a good idea to do them at the same time. Now to answer your questions, yes you have to do the same in the front and back, otherwise you put too much stress on your transfer case. I changed the front shaft about 2 months ago when it finally went out. I'm still waiting on the back one to go.
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Old 06-14-2014, 05:39 AM   #8
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I'm the same way. 3.73, 35‘s, 2.5 inch lift and 70 mph is about 2600 rpm. 80 is maybe 2800 which feels uncomfortable for any longer duration. . I plan to change out the gears later in the year to obtain lockers and rid of this feeling. When you change gears, you have to do front and back at the same time right? I imagine a mismatch would be very bad. Thanks for providing the review of the gears. Did you replace the shafts at the same time? How many spline did you go with.
Do you have a manual or automatic? What gear are you in when driving 70 or 80 MPH . Keep in mind that the ring and pinion change will actually increase your engine RPM's at a given speed in a given gear.

I have a 2013 running 35's with 3.21's and an automatic. The benefit for me in making a gear change is that I spend a great deal of my highway time running in 4th gear because the engine doesn't have enough power to maintain highway speeds at the lower engine RPM of 5th gear. The trick is to find the correct ring and pinion ratio that will increase my RPM's enough to be able to hold 5th gear at highway speeds, but not so much that they are as high as running the same speed now in 4th.

To give you an idea, taking your 2800 RPM's at 80 MPH, here is what RPM's you would be running in the same gear, at the same speed with different ring and pinion ratios:

3.21 - 2409
4.11 - 3085
5.13 - 3850
5.38 - 4038

At 2409 RPM's the engine probably won't have enough power to maintain speed, at 4038 RPM's you have plenty of power, plenty of engine noise, and you better have plenty of places to stop for fuel cause you MPG's just tanked. Hope this info is helpful.
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Old 06-14-2014, 06:19 AM   #9
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Originally Posted by dwtgolden View Post
Do you have a manual or automatic? What gear are you in when driving 70 or 80 MPH . Keep in mind that the ring and pinion change will actually increase your engine RPM's at a given speed in a given gear.

I have a 2013 running 35's with 3.21's and an automatic. The benefit for me in making a gear change is that I spend a great deal of my highway time running in 4th gear because the engine doesn't have enough power to maintain highway speeds at the lower engine RPM of 5th gear. The trick is to find the correct ring and pinion ratio that will increase my RPM's enough to be able to hold 5th gear at highway speeds, but not so much that they are as high as running the same speed now in 4th.

To give you an idea, taking your 2800 RPM's at 80 MPH, here is what RPM's you would be running in the same gear, at the same speed with different ring and pinion ratios:

3.21 - 2409
4.11 - 3085
5.13 - 3850
5.38 - 4038

At 2409 RPM's the engine probably won't have enough power to maintain speed, at 4038 RPM's you have plenty of power, plenty of engine noise, and you better have plenty of places to stop for fuel cause you MPG's just tanked. Hope this info is helpful.
The only time my JEEP ever sees 80 is when it is riding on a trailer!!!!
Of course, I understand that most JEEPS are bought to be just another SUV in JEEP's clothing.
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Old 06-14-2014, 03:56 PM   #10
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The only time my JEEP ever sees 80 is when it is riding on a trailer!!!! Of course, I understand that most JEEPS are bought to be just another SUV in JEEP's clothing.
given that I'm 17, I don't have another vehicle, so I have to balance my jeep for wheeling and daily driving.
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Old 06-14-2014, 07:27 PM   #11
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Originally Posted by dwtgolden View Post
Do you have a manual or automatic? What gear are you in when driving 70 or 80 MPH . Keep in mind that the ring and pinion change will actually increase your engine RPM's at a given speed in a given gear. I have a 2013 running 35's with 3.21's and an automatic. The benefit for me in making a gear change is that I spend a great deal of my highway time running in 4th gear because the engine doesn't have enough power to maintain highway speeds at the lower engine RPM of 5th gear. The trick is to find the correct ring and pinion ratio that will increase my RPM's enough to be able to hold 5th gear at highway speeds, but not so much that they are as high as running the same speed now in 4th. To give you an idea, taking your 2800 RPM's at 80 MPH, here is what RPM's you would be running in the same gear, at the same speed with different ring and pinion ratios: 3.21 - 2409 4.11 - 3085 5.13 - 3850 5.38 - 4038 At 2409 RPM's the engine probably won't have enough power to maintain speed, at 4038 RPM's you have plenty of power, plenty of engine noise, and you better have plenty of places to stop for fuel cause you MPG's just tanked. Hope this info is helpful.
2400 RPM is plenty of power to maintain speed unless pulling a steep grade or at high altitude. I run 2100 RPM at 80 and don't have any issues at 2000 ft above sea level at flat grades. As to not driving a Jeep at 80, yes it pulls double duty.
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Old 06-14-2014, 08:12 PM   #12
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2400 RPM is plenty of power to maintain speed unless pulling a steep grade or at high altitude. I run 2100 RPM at 80 and don't have any issues at 2000 ft above sea level at flat grades. As to not driving a Jeep at 80, yes it pulls double duty.
I am surrounded by "mountains" here. I quote mountains because many would consider them larger hills, but regardless, it is not uncommon for my Jeep to downshift to third or even second from time to time when ascending these hills. I typically run between 70 and 75 on the highway. My point was that I often hear guys changing out their stock gears for something in excess of a 5:1 ratio. The poster I quoted mentioned that his Jeep was turning 2800 on the highway and was complaining it was too high of an RPM. Just making sure he realized what a gear change would result in. That's why I questioned manual or auto and what gear he was in at that RPM.
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Old 06-15-2014, 06:31 PM   #13
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Good to hear. looking forward to 5.38's in my sport
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Old 06-15-2014, 11:43 PM   #14
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Originally Posted by dwtgolden View Post
Do you have a manual or automatic? What gear are you in when driving 70 or 80 MPH . Keep in mind that the ring and pinion change will actually increase your engine RPM's at a given speed in a given gear.

I have a 2013 running 35's with 3.21's and an automatic. The benefit for me in making a gear change is that I spend a great deal of my highway time running in 4th gear because the engine doesn't have enough power to maintain highway speeds at the lower engine RPM of 5th gear. The trick is to find the correct ring and pinion ratio that will increase my RPM's enough to be able to hold 5th gear at highway speeds, but not so much that they are as high as running the same speed now in 4th.

To give you an idea, taking your 2800 RPM's at 80 MPH, here is what RPM's you would be running in the same gear, at the same speed with different ring and pinion ratios:

3.21 - 2409
4.11 - 3085
5.13 - 3850
5.38 - 4038

At 2409 RPM's the engine probably won't have enough power to maintain speed, at 4038 RPM's you have plenty of power, plenty of engine noise, and you better have plenty of places to stop for fuel cause you MPG's just tanked. Hope this info is helpful.

Thanks DWT. My JKU is Automatic. I haven't paid attention to what gear. I'll start to watch it. Thanks for the insight, as I didn't know the RPMs would jump that high for the higher ratios.
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Old 06-15-2014, 11:56 PM   #15
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He's a 07 so if he has an auto it is a 42 which means he has a .69 od four speed. With the 3.8 and 35's he would be in 3rd or 1 to 1 on the highway. With the 5.13's my buddy's 10 runs right at the same rpm as my 13 auto with 4.56's and 35's. Did you reconfigure your speedo to reflect the bigger tires and gear change? If not your numbers will be off.
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Old 06-16-2014, 12:26 AM   #16
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The price of a loaded jeep I pray for a real motor soon - like a ecoboost ford motor. I hate the 3.6 what a joke with 35's
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Old 06-16-2014, 12:32 AM   #17
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The price of a loaded jeep I pray for a real motor soon - like a ecoboost ford motor. I hate the 3.6 what a joke with 35's
you are in a 3.6 hating mood tonight arent you?
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Old 06-16-2014, 06:32 AM   #18
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I can't wait for the new generation jeeps to come out so mine could be considered a "real" jeep lol
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Old 06-16-2014, 11:28 PM   #19
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you are in a 3.6 hating mood tonight arent you?
My goodness am I!
Did a trip from phoenix to flagstaff Arizona last week and just hated it
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Old 06-17-2014, 01:25 PM   #20
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09 JKU Auto with 3.73 on 35's and I live in a flat area but my jeep still struggles to maintain it's speed. Even cruising around town it downshifts a lot. Makes me feel bad for the engine, so gears will be coming sooner rather than later. It wasn't great at holding it's speed at highway speeds even when it was stock. Taking it on a road trip this coming week so it's got it's work cut out for it
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Old 06-17-2014, 05:34 PM   #21
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I swapped half doors for full doors from a guy with the exact JKU as mine. 2009 JKUX Auto. We both had 35's. Only diff was I have 5.13 gears and he still had 3.73, so he took mine out for a quick spin to see the difference.

His reaction was it was going to be his next mod, it made that much of a difference to him.
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Old 06-17-2014, 05:55 PM   #22
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My goodness am I! Did a trip from phoenix to flagstaff Arizona last week and just hated it
maybe you should sell ur jk, and buy a pre 2012. That way you'll have that masterpiece 3.8 motor. Honestly, you are in a jeep. What were you expecting?
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Old 06-18-2014, 12:47 AM   #23
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The price of a loaded jeep I pray for a real motor soon - like a ecoboost ford motor. I hate the 3.6 what a joke with 35's
I have a 2012 automatic with 35x12.50x17 BFG KM2s and it works wonderfully. It did OK before I went with 4.56 gears, but now it is 'perfect'!

LOL!

As far as the ecoboost goes, do some research before blowing $$ on one. You'll be surprised how many people out there hate 'that' engine.

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Old 06-25-2014, 09:20 PM   #24
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I am running 35" Toyos with a 4" lift, automatic, in my 08 JK. Going to the G2 5.13's was the best mod I could have done. Mileage went up as well as overall pep and punch. With the stock 373's, MY JEEP WAS A DAWG! Now, I have to be careful with the pedal.
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Old 01-02-2015, 10:02 PM   #25
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For those of y'all who can't decide whether or not you want to make the plunge into purchasing new gears, I am going to tell you what I've noticed since I got mine done.

I bought G2 5.13 gears about a year after I got my lift and tires. Since I lifted it, I'd say my jeep lost about 30, maybe 40% of it's power. I'm not going to tell you that buying gears fixed that problem completely, but I'll do my best to list the pros and cons through out this post.

Before I lowered my gear ratio, I was running the stock 3.73 ratio and couldn't even keep up with highway traffic. I was forcing 70 mph at about a whopping 4500 rpm. With the new gears, going 70 is a breeze. In fact, going 80 is easy too.

I can't say that I've noticed a direct increase in power in the throttle response, but the most notable difference is after 3rd gear. The jeep has to work a whole lot less to stay at higher speeds. I have noticed that the first two gears are a little rough, but that's not that big of a deal.

Fuel mileage has increased a little bit, but nothing too drastic, so if that's what you have in mind, gears may not be your best bet... Better yet, a jeep isn't at all.

So my suggestion is this: if you have the money, a lower gear ratio to match bigger tires is definitely a good investment.
So I'll apologize for resurrecting an old thread but I'm curious to hear an updated review 6 months later. I'm about to pull the trigger on gears and 35" Toyos and have a JKUx auto. My gut is telling me 5.13s but 95% of my driving is city so I need to pick the best gears for city driving first and foremost. 4.88s is the other option but I don't want to be under powered. If you or anyone can share city MPGs that would be great. Thanks!
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Old 01-02-2015, 11:23 PM   #26
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So I'll apologize for resurrecting an old thread but I'm curious to hear an updated review 6 months later. I'm about to pull the trigger on gears and 35" Toyos and have a JKUx auto. My gut is telling me 5.13s but 95% of my driving is city so I need to pick the best gears for city driving first and foremost. 4.88s is the other option but I don't want to be under powered. If you or anyone can share city MPGs that would be great. Thanks!
Im still loving my 5.13's on my 2012 6sp on 35's 4 months later... slightly different being manual vs auto but in the summer I was getting around the 15-16 mpg mark in small town driving. That would go down with a lot of stop and go I'd imagine, depending where you are and where you drive 4.88 might be a better choice if it's mostly big city driving. I'd recomend the 5.13's for more wheeling, high elevation driving or towing. On the other hand there isn't a huge difference from 4.88 to 5.13...
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Old 01-03-2015, 01:31 AM   #27
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Im running stock 3.73 gears with 35" mud grapplers on 20" rims. When I first put them on the power reduction and mpgs went down drastically. However, when I got a tuner called flashpaq 3872 from amazon. It did the biggest difference in mpgs and power while running on my 35s with a 3" lift. Feels just a bit better than running all stock (original tires and no lift) . Changing gears seems expensive and alot of work. Tuner worked beautifully for me.
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Old 01-03-2015, 04:44 AM   #28
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So I'll apologize for resurrecting an old thread but I'm curious to hear an updated review 6 months later. I'm about to pull the trigger on gears and 35" Toyos and have a JKUx auto. My gut is telling me 5.13s but 95% of my driving is city so I need to pick the best gears for city driving first and foremost. 4.88s is the other option but I don't want to be under powered. If you or anyone can share city MPGs that would be great. Thanks!
I see that you have a 2009 Unlimited 3.8 engine, and want to run 35's.
If you have a manual, then 4.88 ratio.
If you have a auto, (which you have), then the 5.13 ratio.

This would be your optimum ratio's......
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Old 01-03-2015, 05:48 AM   #29
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[QUOTE=Creeperjk;11351249]The price of a loaded jeep I pray for a real motor soon - like a ecoboost ford motor. I hate the 3.6 what a joke with 35's[/QUOT]

The 3.6 is better than the 3.8 Ill tell you that.
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Old 01-04-2015, 11:28 AM   #30
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The price of a loaded jeep I pray for a real motor soon - like a ecoboost ford motor. I hate the 3.6 what a joke with 35's
Really? The 3.6l is actually a good motor when geared properly to its application.... as usual is owner is to blame for being the unhappy one... try putting 35's on a 4 runner, fj cruiser etc and you get the same result. These vehicles aren't built to run 35's from the factory, therefor modifications are required to do so comfortably

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