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Unread 08-17-2012, 12:43 AM   #1
humbled
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4.88 vs.4.56 gears

I am about to do it. 4.0 with 3 speed auto with overdrive. 33 in tires. I favor the 4.88. What do you guys think ?

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Unread 08-17-2012, 12:48 AM   #2
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Quote:
Originally Posted by humbled View Post
I am about to do it. 4.0 with 3 speed auto with overdrive. 33 in tires. I favor the 4.88. What do you guys think ?
What year is your Jeep?

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Unread 08-17-2012, 12:56 AM   #3
humbled
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2006. Yes, I should fill out my profile.
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Unread 08-17-2012, 04:02 AM   #4
AlexGeorgakis
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i'd say stick to 4.56 if you're going to be using 33s. I was happy with that ratio.
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Unread 08-17-2012, 05:52 AM   #5
jefro_97tj
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He should have the 42rle 4speed where your 01 had the 32rh 3speed. I'd say 4.88
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Unread 08-17-2012, 08:32 AM   #6
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4.88 without a doubt.

RPM will be about 2,500 at 70 MPH which is perfect.
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Unread 08-17-2012, 09:05 AM   #7
Jerry Bransford
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Yep your 2006 has a 4-speed automatic, the 42RLE, it is not a 3-speed that was last used in 2002. Based on that, you should be running 4.88 for 33" tires. Don't even consider 4.56.
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Unread 08-17-2012, 10:23 AM   #8
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While were on this topic and instead of making a new thread about it.
From what I've researched for my 4.0 5speed 4.56 gears would be a good choice correct? I'm running 33s and will be upgrading to 35's when the tread wears out on these which will be by the end of the year more then likely.

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Unread 08-17-2012, 11:09 AM   #9
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Quote:
Originally Posted by Budke View Post
While were on this topic and instead of making a new thread about it.
From what I've researched for my 4.0 5speed 4.56 gears would be a good choice correct? I'm running 33s and will be upgrading to 35's when the tread wears out on these which will be by the end of the year more then likely.

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I had 4.56 gears with 33s and was happy with the combo. When I switched to 35s it was still good, but I recently switched axles and changed to 4.88s and am glad I did. You could certainly get by with 4.56, but I prefer 4.88.
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Unread 08-17-2012, 11:34 AM   #10
Jerry Bransford
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Quote:
Originally Posted by Budke View Post
While were on this topic and instead of making a new thread about it.
From what I've researched for my 4.0 5speed 4.56 gears would be a good choice correct? I'm running 33s and will be upgrading to 35's when the tread wears out on these which will be by the end of the year more then likely.
4.56 is ideal for 33" tires but since you will be going with 35", I would regear to 4.88.
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Unread 08-17-2012, 02:41 PM   #11
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Jerry,
If I remember correctly I seem to recall you once recommended 4.10 for jeeps with the 32RH running 33's?
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Unread 08-17-2012, 03:15 PM   #12
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I had a quick question regarding gearing too.

Are 4.88s ideal for 35s on a 2006 LJ auto and laden with steel? Should i look into that?
And will I be continuing to turn of the OD button with 4.88s?

Or should I look into 5.13s? I occasionally pull a trailer, wheel on hefty rocks and stuff.

Currently it's got 4.10s w 33s and it seems if I go to 35s and 4.88s I will be continuing to push the OD button off. Is that so?

5.13s and 35s, or 4.88s and 35s?
What's the opinion/knowledge on this?
I would like to learn a little more.
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Unread 08-17-2012, 04:05 PM   #13
Jerry Bransford
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Quote:
Originally Posted by gebirgziege View Post
I had a quick question regarding gearing too.

Are 4.88s ideal for 35s on a 2006 LJ auto and laden with steel? Should i look into that?
And will I be continuing to turn of the OD button with 4.88s?

Or should I look into 5.13s? I occasionally pull a trailer, wheel on hefty rocks and stuff.

Currently it's got 4.10s w 33s and it seems if I go to 35s and 4.88s I will be continuing to push the OD button off. Is that so?

5.13s and 35s, or 4.88s and 35s?
What's the opinion/knowledge on this?
I would like to learn a little more.
Your 4-speed auto's overdrive ratio is so steep that for 35" tires, I'd definitely go 5.13 or probably even 5.38 for 35" tires. After my previous TJ was stolen, I bought a used Rubicon with 35" tires and 4.88 gearing and it's a terribly frustrating combination, the engine lugs so often on the highway that I am nearly constantly jabbing the Overdrive switch to get the RPMs up enough to stop it from lugging.

When I had my previous TJ with 35" tires and its 5-speed, 4.88 was ideal. But the 4-speed automatic changes all that, it needs a substantially lower ratio like 5.13 or 5.38 to bring the rpms to where they need to be.
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Unread 08-17-2012, 11:52 PM   #14
humbled
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4.56 vs. 4.88 gears

Thanks everyone for your replies. Sounds like 4.88 with my 42rle auto trans is the setup I need.
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Unread 08-18-2012, 12:35 AM   #15
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Quote:
Originally Posted by Jerry Bransford
Your 4-speed auto's overdrive ratio is so steep that for 35" tires, I'd definitely go 5.13 or probably even 5.38 for 35" tires. After my previous TJ was stolen, I bought a used Rubicon with 35" tires and 4.88 gearing and it's a terribly frustrating combination, the engine lugs so often on the highway that I am nearly constantly jabbing the Overdrive switch to get the RPMs up enough to stop it from lugging.

When I had my previous TJ with 35" tires and its 5-speed, 4.88 was ideal. But the 4-speed automatic changes all that, it needs a substantially lower ratio like 5.13 or 5.38 to bring the rpms to where they need to be.

Thanks Jerry.
I'm going to look into 5.13s a little more. I've seen them cheaper than 4.88s too, so that's a little bit of a plus.

I have also heard that 4.88s are stronger than 5.13s- is this true?

Has anyone ever driven a similar setup?
4 speed w 35s and 5.13s vs the same w/ 4.88s?
Could you tell a difference?
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