4.88 vs 5.13, 3.6 and 37's - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 34 Old 09-13-2016, 09:11 AM Thread Starter
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4.88 vs 5.13, 3.6 and 37's

working on buying a 10a jkur and I will be going with 3.5" lift and 37's immediately, but I cant decide between 4.88 and 5.13 gears. jeep will see a lot of road use (~60 miles round trip to work) and some of that will be flat towing my tj around, it will also see a decent amount of trail use. I keep thinking 5.13's but im afraid that is too deep for highway use all the time, what do yall think?
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post #2 of 34 Old 09-13-2016, 10:02 AM
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I just finished my JKU build and went with 4.88 and 37's tires. The jeep has more get up with the 37's and 4.88's then it did with stock tires and 3.73's. Runs about 2450 RPM at 70 on the highway...

I think 4.88's and 37's is a prefect combo!!!
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post #3 of 34 Old 09-13-2016, 01:51 PM
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4.88 vs 5.13, 3.6 and 37's

Manual or auto?


Mine is an auto and I have 4.88's. My tires actually measure at 36 and at 70 mph I'm around 2700 RPM. So I'm glad I went 4.88.

Not sure how high I'll be when driving out of town. With 85 MPH speed limits, it'll be screaming. LOL!


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post #4 of 34 Old 09-13-2016, 02:14 PM Thread Starter
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I guess I should have included that, its auto
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post #5 of 34 Old 09-13-2016, 02:31 PM
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On my 2015 JKU with 37" Nittos I run 4.88 and as mentioned above, it feels like the Jeep has more get up and go now then when it was stock

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post #6 of 34 Old 09-13-2016, 03:10 PM
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Go with 4.88s!


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post #7 of 34 Old 09-13-2016, 06:16 PM Thread Starter
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I think that's the plan Marcus, I was thinking 5.13's but with so many people saying 4.88 I guess that's gonna be what I do. As soon I get the papers signed I will order them, hopefully come up with some cash to order a lift from you also
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post #8 of 34 Old 09-13-2016, 06:54 PM
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10 has a 3.8. The 3.6 came out in 12. The bigger difference is the auto trans. The ones in 2010 suck without low enough gears.
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post #9 of 34 Old 09-13-2016, 07:53 PM Thread Starter
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Quote:
Originally Posted by longlegs View Post
10 has a 3.8. The 3.6 came out in 12. The bigger difference is the auto trans. The ones in 2010 suck without low enough gears.
10a not 2010, it's a 2013 10th anniversary rubicon jku
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post #10 of 34 Old 09-14-2016, 06:35 AM
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I run 37s in my '13 JKUR, have 5:13s, and couldn't be happier. At 65 MPH I'm at 2500 RPM, the Jeep will hold speed up moderate inclines, the performance feels slightly better than stock, and fuel economy seems as good as stock if not better.

A fellow Jeeper in my area has a supercharged 3.8 JKU automatic with 4.88s... he wishes he went with 5:13s.

If you travel at higher elevations, you will be much happier with 5:13s

Just my worthless 2cents worth.
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post #11 of 34 Old 09-14-2016, 07:17 AM
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Originally Posted by baddkarmaracing View Post
I think that's the plan Marcus, I was thinking 5.13's but with so many people saying 4.88 I guess that's gonna be what I do. As soon I get the papers signed I will order them, hopefully come up with some cash to order a lift from you also
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Originally Posted by Off Pavement View Post
I run 37s in my '13 JKUR, have 5:13s, and couldn't be happier. At 65 MPH I'm at 2500 RPM, the Jeep will hold speed up moderate inclines, the performance feels slightly better than stock, and fuel economy seems as good as stock if not better.

A fellow Jeeper in my area has a supercharged 3.8 JKU automatic with 4.88s... he wishes he went with 5:13s.

If you travel at higher elevations, you will be much happier with 5:13s

Just my worthless 2cents worth.
I run 5:13's and could not be happier. I have a Rubicon with a manual transmission. It felt great when I was NA and feels excellent now that I am FI+WMI.

I like the off-road crawl speed and the on road cruising speed. The 5:13's really help pull me out of the hole under hard acceleration as well.
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post #12 of 34 Old 09-14-2016, 07:55 AM
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Flat highways go 4.88, lots of steep hills on the highway then go 5.13

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post #13 of 34 Old 09-14-2016, 08:20 AM
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The first couple of responses had me convinced....now not so much

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post #14 of 34 Old 09-14-2016, 08:39 AM
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It really comes down to the ACTUAL driving you do, not wishful.....I'd love to wheel more, just don't have the time. On the beach with it often. But i still love having a Jeep. Im on 37's with 4.56's & auto, driving it 900 miles a week, Phila PA to N.Wildwood NJ, its nearly all flat. Currently getting 18mpg, cruising 65mph at 2200rpm, It has plenty of power to pass. Its a Jeep, I'm not trying to hole shot young bucks at stop lights, so its fine off the line for me, 13mpg city.
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post #15 of 34 Old 09-14-2016, 09:58 AM
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Flat highways go 4.88, lots of steep hills on the highway then go 5.13
Agreed with the above statement. I seriously doubt one would be able to tell the difference offroad in 4:1 low range. It really comes down to highway driving and how much it bothers you when the auto is constantly shifting due to lack of power at that RPM. I have 4.88's on 37s but should have went 5.13s.

If one had lots more torque over a broad rpm, i.e. V8 engine, the gearing wouldn't as crucial as with the anemic pentastar.

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post #16 of 34 Old 09-14-2016, 01:35 PM Thread Starter
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I live In deep south texas, the only hills we have are man made (expressway overpasses) we are damn near sea level also.
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post #17 of 34 Old 09-14-2016, 01:53 PM
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You should be fine with 4.88. With the 4:1 transfer case off road should not be an issue between 4.88 or 5.13

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post #18 of 34 Old 09-14-2016, 06:00 PM
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Quote:
Originally Posted by thedirtman View Post
Flat highways go 4.88, lots of steep hills on the highway then go 5.13
I agree with this, but would add long steep hills.

I have 4.88s with my '13 and am happy. I think I get 14 mpg to 16 mph with mixed use.

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post #19 of 34 Old 09-14-2016, 06:25 PM
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Originally Posted by baddkarmaracing View Post
10a not 2010, it's a 2013 10th anniversary rubicon jku
Ahh. I missed that. So, I will add my 2 cents about 3.6 w 4.88. I have 35's and feel it is spot on for gearing. I just did 3000 mile trip through Colorado and was very happy with the performance. The transmission did not hunt for gears through the passes. I ran about 3000 rpms on the interstate and it was a little over 75 mph. I think 70 is about 2750. I got 16mpg.
I have pulled a 14 foot utility trailer ( 4ft ramp gate) with a mower on the highway and it stays in 5th gear at 60.
I think it would do well with 37's but in a strong head wind or pulling hills I think it would drop a gear. I don't think the new transmission hunts for gears like the old one.
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post #20 of 34 Old 05-12-2017, 08:33 PM
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Thought I'd revive an old thread, hope y'all don't mind.
For any of you running 3.6, auto, 37s & 4.88s, do you ever wish you'd have gone with 5.13.
I know this topic has been beaten to death over the years, so apologies in advance. Just wanna make the right choice on Monday when I go in for regear.
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post #21 of 34 Old 05-12-2017, 09:36 PM
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Nope.


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post #22 of 34 Old 05-13-2017, 04:42 AM
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Quick feedback

. I run 4.56 and 37s. No prob. But there is an LS swap in my future so I geared for that.
. 4.88 and 5.13 differ by a only few hundred rpm at freeway.
. If you have a Rubi and the 4:1 case. Going with higher, lower numerical, is easy as you will crawl great.
. 5.13 is tiny in a 30. Better in a 44, but still...
. Are you sure 37 is the end of all this? My 37s look small with my MCE flares... Look to th future.

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post #23 of 34 Old 05-13-2017, 08:17 AM
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Everyone i know with a 3.6 4.88's and 37's wishes they went with 5.13's. If you plan on adding bumpers, winch, carry rescue equipment or just being heavy the 5.13's is where you want to be at.

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post #24 of 34 Old 05-13-2017, 02:20 PM
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Quote:
Originally Posted by codyzx7 View Post
Thought I'd revive an old thread, hope y'all don't mind.
For any of you running 3.6, auto, 37s & 4.88s, do you ever wish you'd have gone with 5.13.
I know this topic has been beaten to death over the years, so apologies in advance. Just wanna make the right choice on Monday when I go in for regear.
If it your DD or you like taking long trips 4:88's. I put 5:13's in a friends jeep and he hates driving it on the highway the engine screams when doing 70. He plans on gearing it down to 4:88's when cash becomes available.

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post #25 of 34 Old 05-13-2017, 03:08 PM
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There is more to it than just tire size. Type of rims / tire weight plays a roll too. We are still running stock 4:10 on our 2012 Rubicon. Have 37 KM2 on ATX slabs now and it drive very acceptable. No problem keeping 70 mph in 5th gear on interstate even with a head wind. Had the same rims with heavier 35" Nitto Trail Grabblers before these and it was bad. The plan is still to do 4:88 but since it drives so much better it is back on the back burner. Gas milage with the 37's is back up to 15,5 mpg compared to the 13 mpg with the 35's.

And yes, I do have a Pro Cal and know how to set it for wheel size.
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