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Old 08-26-2012, 05:02 PM   #1
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Question Regearing to 4.56 or 4.10

Hello,

Like you know, i have a jku 2011 sahara with auto shitty 42rle and stock tires. I asked to 4x4 shop what gearing ratio I should put in my rig to have decent highway behavior and they proposed me the 4.56 or 4.10 .. not the 4.88 ?

I do about 90 % highway.

Im still confused as trading the jeep for a 2012 with manual transmission or do the 4.56 . That's where im at now.

Please give me some help.

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Old 08-26-2012, 05:46 PM   #2
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I'm no gear expert but there is a chart someone might post that shows tire size and rpm etc. I have a 2011 rubicon auto with 4.10 and I know I would be happy with going to 4.56 just with the stock tires. So I would not even look at 4.10 for future mods etc.

Just my two cents...

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Old 08-26-2012, 05:49 PM   #3
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Quote:
Originally Posted by Skalve85
I'm no gear expert but there is a chart someone might post that shows tire size and rpm etc. I have a 2011 rubicon auto with 4.10 and I know I would be happy with going to 4.56 just with the stock tires. So I no even look at 4.10 for future mods etc.

Just my two cents...
do you think it will be worth it ? especially on the highway ?
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Old 08-26-2012, 05:57 PM   #4
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Originally Posted by patrickp View Post
do you think it will be worth it ? especially on the highway ?
Well on the highway I cruise at 65-75 mph and can get 20 mpg with the stock 32 rubicon tires. So I guess that's up to you and your future mods.
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Old 08-26-2012, 06:05 PM   #5
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Quote:
Originally Posted by patrickp View Post
Hello,

Like you know, i have a jku 2011 sahara with auto shitty 42rle and stock tires. I asked to 4x4 shop what gearing ratio I should put in my rig to have decent highway behavior and they proposed me the 4.56 or 4.10 .. not the 4.88 ?

I do about 90 % highway.

Im still confused as trading the jeep for a 2012 with manual transmission or do the 4.56 . That's where im at now.

Please give me some help.
Here's the chart. Use your ACTUAL tire size, not what the mfr calls it (i.e., 33's are usually 32's; 35's are usually 34's, etc...don't know what the stock tires actual sizes are).



As you can see, the auto 3.8L engines need a lot more help than those w/manual transmissions. The problem with getting a regear on a stock Jeep, as I see it, is that you'll have to do it again if you decide later to go with larger tires.

If you're gonna keep running stock tires (or tires of the same size), then go for it. If not, might wanna wait till mods are done, THEN do the regear.
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Old 08-26-2012, 06:33 PM   #6
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Quote:
Originally Posted by patrickp View Post
Hello,

Like you know, i have a jku 2011 sahara with auto shitty 42rle and stock tires. I asked to 4x4 shop what gearing ratio I should put in my rig to have decent highway behavior and they proposed me the 4.56 or 4.10 .. not the 4.88 ?

I do about 90 % highway.

Im still confused as trading the jeep for a 2012 with manual transmission or do the 4.56 . That's where im at now.

Please give me some help.
Are you going with bigger tires? How big if so? IMO the 4x4 shop is wrong and I am suspicious of how many Jeeps, especially JK's, they do. If you are going with 33" tires or bigger then 4.10 and 4.56 would be a waste to me. One I would never suggest a gear ratio that you can get from the factory, 4.10. Secondly 4.56 on an Auto 3.8L Jk is a waste of money. 4.88 would be the sweet spot for 33's and an auto trans. If you are going up to 35's then go with 5.13, however the 4.88 would be decent for 35's but why settle for decent fi you have the build planned out already.

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Old 08-27-2012, 10:00 AM   #7
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Regearing to 4.10 is a waste of money and for some strange reason the 4.56s for one end of the JK are a lot more expensive than the other ratios. Your question should really be whether you should do 4.88 or 5.13, especially if larger tires are in your future. If you do 90% highway I would probably lean towards the 4.88.
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Old 08-27-2012, 11:37 AM   #8
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2011 jk 33" tires Manual trans and I have the 4.56'es. IMO they are perfect for my set up. If I had the auto w/33's though I'd definitly go to the 4.88's.
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Old 08-27-2012, 02:14 PM   #9
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I would not regear. I'd lean towards a 2012 or '13 w/an auto. More power, better transmission - you should get decent $$$ for your near new 2011. I don't think you're going to get good value regearing a near new 2011.
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Old 08-27-2012, 03:53 PM   #10
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Yeah trade in your near new vehicle that lost equity since day one on a new one.

Go through credit pull again, down payments and a re-up on a new set of payments.

OP, you would be delighted with a regear and if you are planning on modifying your '11, keep it and make it uniquely yours.

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Old 08-27-2012, 06:51 PM   #11
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I don't quite understand the chart, I am running 32s with the auto, and I cruise in OD all the time except steep hills, and I am still stock with 4.10s. I would eventually like to regear, not to run big tires, but for a better crawl ratio, I love the 4:1 in the T-case with the 4.10s, can't imagine how sweet 4.88s would be.
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Old 08-27-2012, 07:40 PM   #12
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Originally Posted by 3JKs1H1 View Post
I would not regear. I'd lean towards a 2012 or '13 w/an auto. More power, better transmission - you should get decent $$$ for your near new 2011. I don't think you're going to get good value regearing a near new 2011.
Yeah i was stupid enough to try a 2012. The engine is very smooth. More adapted for my use.

I do a little mudding but it is mostly a DD vehicule.
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Old 08-27-2012, 07:41 PM   #13
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Originally Posted by Daniel_M View Post
Are you going with bigger tires? How big if so? IMO the 4x4 shop is wrong and I am suspicious of how many Jeeps, especially JK's, they do. If you are going with 33" tires or bigger then 4.10 and 4.56 would be a waste to me. One I would never suggest a gear ratio that you can get from the factory, 4.10. Secondly 4.56 on an Auto 3.8L Jk is a waste of money. 4.88 would be the sweet spot for 33's and an auto trans. If you are going up to 35's then go with 5.13, however the 4.88 would be decent for 35's but why settle for decent fi you have the build planned out already.

-Dan
If i forced them to install 4.88, will they void the gear warranty ?

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