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Old 02-17-2013, 11:01 AM   #1
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4.88 or 5.13

Ok so once I get the new axle in. I will regear , but I'm trying to decide on gears ratio. I have 37's now which I love and long term like 2 years from now, may, may, go to 38's . So what does everybody think? The things I'm worried about with 5.13 and closed diff are the small teeth and top highway speed. This is still my daily driver. Thanks everyone.

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Old 02-17-2013, 11:28 AM   #2
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The axle guys will ring in soon, but if you do the math, there's not alot of difference there

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Old 02-17-2013, 01:58 PM   #3
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When I was calling around getting quotes for mine, every place I talked to said to skip the 4.88's and go with the 5.13's...
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Old 02-17-2013, 02:24 PM   #4
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With an auto it seems most people go lower, so either 5.13 or 5.38, but since you have the 3.6 motor I don't know.

I'm actually debating the same thing, but since I have a 6 speed and the 3.6, 4.88's would be more tolerable for me than you. I have a 20 mile round trip highway commute mon-fri so lower highway rpm's are better for me so I'm leaning towards 4.88's
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Old 02-17-2013, 02:29 PM   #5
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Originally Posted by Rooster454 View Post
With an auto it seems most people go lower, so either 5.13 or 5.38, but since you have the 3.6 motor I don't know.

I'm actually debating the same thing, but since I have a 6 speed and the 3.6, 4.88's would be more tolerable for me than you. I have a 20 mile round trip highway commute mon-fri so lower highway rpm's are better for me so I'm leaning towards 4.88's
Ya. I just feel like the 5's are risky for me. I would prefer lower rpm's I know the improvement to either will be huge from my 3.73's
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Old 02-17-2013, 10:06 PM   #6
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go 4:88s if you are never going larger than possibly 38s
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Old 02-17-2013, 11:41 PM   #7
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Danny's right, 4.88 is a good compromise. If you go above 37 on tires your daily driver is going to be pretty questionable just on basis of that. The difference in gearing is less than five per cent. The reliability factor easily offsets that.
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Old 02-18-2013, 12:52 AM   #8
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Danny's right, 4.88 is a good compromise. If you go above 37 on tires your daily driver is going to be pretty questionable just on basis of that. The difference in gearing is less than five per cent. The reliability factor easily offsets that.
Thanks Ed. That's what I figured but wanted to make sure.
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Old 02-18-2013, 12:24 PM   #9
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Originally Posted by wanderlust
go 4:88s if you are never going larger than possibly 38s
Thanks Dan. I think its the safest bet and best all around. Have you regeared?
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Old 02-18-2013, 12:36 PM   #10
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Nope, need to.. Just lazy and procrastinating
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Old 02-18-2013, 12:44 PM   #11
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Nope, need to.. Just lazy and procrastinating
Haha. Ya... just kinda wanted to get someone's review on how much of an improvement 4.88 with the new engine is
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Old 02-18-2013, 12:47 PM   #12
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Well mine is drivable with heavy 37s and a stickshift on 4:10s. So 4:88s and an auto should do good. Besides, your main concern is street so it is a better choice for you
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Old 02-18-2013, 01:01 PM   #13
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Quote:
Originally Posted by wanderlust
Well mine is drivable with heavy 37s and a stickshift on 4:10s. So 4:88s and an auto should do good. Besides, your main concern is street so it is a better choice for you
Ya. Mine is driveable as is. But she's a dog and fuel economy is crap.
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Old 03-19-2013, 07:24 PM   #14
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I'm thinking about regearing. I have 325/60 tires which measure 35" mounted. I'm leaning toward 5.13. Does anyone have 5.13's on a 3.6 pentastar?
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Old 03-20-2013, 12:19 AM   #15
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Originally Posted by Mopar2Ya View Post
I'm thinking about regearing. I have 325/60 tires which measure 35" mounted. I'm leaning toward 5.13. Does anyone have 5.13's on a 3.6 pentastar?
5.13's with 35's is an overkill. To put it in perspective, I geared my crawler on 40's and one ton axles to 5.13 to get a good blend between road and hardcore trail use.

Max gear ratio for 35's should be 4.88 (4.56 is comfortable for both highway and trail). On stock axles, to include the dana 44, high ratios can overstress the ring/pinion/and diff housing.
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Old 03-20-2013, 12:30 AM   #16
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I currently have 4:56 with 35's and I'm not happy with it, I'm planning on upgrading to 5:13 and may move to 37's.
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Old 03-20-2013, 12:58 AM   #17
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I currently have 4:56 with 35's and I'm not happy with it, I'm planning on upgrading to 5:13 and may move to 37's.
You running 44's front and rear Terry?
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Old 03-20-2013, 09:01 AM   #18
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You running 44's front and rear Terry?
Ed,

I'm running a Dana 44 up front and Ford 8.8 in the rear with moser shafts.
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Old 03-20-2013, 10:28 AM   #19
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I've got a 2012 auto JKUR running 35's with the stock 4.10's and of course the 3.6L Jesus Engine. I'm constantly using the "auto-stick" to upshift when driving on pavement anywhere above 45MPH. It'll just sit at the upper end of the RPM range (not quite in the redline zone) unless I manually hit the auto-stick to upshift. I had everything professionally calibrated using a ProCal so I think all the shift-points should be optimized for my current set-up. That being said it looks like I'm just going to need to regear however like a lot of people here I'm struggling to figure out which gearing would be the best for my set-up (4.88, 5.13, 5.38).

Any recommendations on the best gearing for my set-up? Also, excuse my ignorance on this topic but can someone here explain how I should expect the performance of my Jeep to change when I regrear. I'm perfectly happy with the trail performance of my Jeep at this point (no complaints at all), my only complaint is pavement performance. So when I regrear how will that effect:

1. Performance when accelerating from a full stop, should I expect it to be more "jerky" or will that not be an issue?
2. Shifting from gear to gear, should I expect it to be more "jerky" or will it shift just as smoothly as the stock 4.10's.
3. Higher speeds (45MPH+) should I expect the regearing to resolve the issue with needing to manually upshift in order to keep the tach out of higher RPM range?
4. Finally, from an overall perspective what should I expect to see change from regearing. What are the overall pros/cons of rehearing?

Sorry for the novel here but I'd really like to get some useful information from those of you who have a much better understanding of gearing than I do. Thanks!
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Old 03-21-2013, 04:42 PM   #20
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Oops I didn't realize this was a regional thread, oh well it's good info.
Quote:
Originally Posted by Goofyjumper View Post
5.13's with 35's is an overkill. To put it in perspective, I geared my crawler on 40's and one ton axles to 5.13 to get a good blend between road and hardcore trail use.

Max gear ratio for 35's should be 4.88 (4.56 is comfortable for both highway and trail). On stock axles, to include the dana 44, high ratios can overstress the ring/pinion/and diff housing.
My tires are more a ~36" where actual measure at 35". I'm torn between 4.88 & 5.13. I know 4.88 will keep my cruising rpms lower, but I don't want to lug like my 4.10 do now. I can down shift to 4th & it still doesn't feel/sound like my rpms are too high. What does a stock rubi turn at 70mph?
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Old 03-21-2013, 04:52 PM   #21
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I've been kicking with 4.88 for about 2 months now, Love em, but I have a 6 speed.
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Old 03-21-2013, 05:08 PM   #22
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Quote:
Originally Posted by MajorChuck View Post
I've got a 2012 auto JKUR running 35's with the stock 4.10's and of course the 3.6L Jesus Engine. I'm constantly using the "auto-stick" to upshift when driving on pavement anywhere above 45MPH. It'll just sit at the upper end of the RPM range (not quite in the redline zone) unless I manually hit the auto-stick to upshift. I had everything professionally calibrated using a ProCal so I think all the shift-points should be optimized for my current set-up. That being said it looks like I'm just going to need to regear however like a lot of people here I'm struggling to figure out which gearing would be the best for my set-up (4.88, 5.13, 5.38).

Any recommendations on the best gearing for my set-up? Also, excuse my ignorance on this topic but can someone here explain how I should expect the performance of my Jeep to change when I regrear. I'm perfectly happy with the trail performance of my Jeep at this point (no complaints at all), my only complaint is pavement performance. So when I regrear how will that effect:

1. Performance when accelerating from a full stop, should I expect it to be more "jerky" or will that not be an issue?
2. Shifting from gear to gear, should I expect it to be more "jerky" or will it shift just as smoothly as the stock 4.10's.
3. Higher speeds (45MPH+) should I expect the regearing to resolve the issue with needing to manually upshift in order to keep the tach out of higher RPM range?
4. Finally, from an overall perspective what should I expect to see change from regearing. What are the overall pros/cons of rehearing?

Sorry for the novel here but I'd really like to get some useful information from those of you who have a much better understanding of gearing than I do. Thanks!
^x2

Someone please answer this.
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Old 03-21-2013, 05:13 PM   #23
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I've been kicking with 4.88 for about 2 months now, Love em, but I have a 6 speed.
Any regret(want 5.13)?
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Old 03-21-2013, 05:19 PM   #24
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Any regret(want 5.13)?

Not yet, I'm still "happy" with my 35's. That said, I can run 40's on 4.88 and still be acceptable. I want to go bigger, and higher, just don't have the funds right now. I cruise at 65mph @ about 2650-2700 rpm in 6th. I don't think I would have been happy if I went higher then 4.88.

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