4.56 or 4.88? - JeepForum.com
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post #1 of 67 Old 02-07-2012, 11:42 AM Thread Starter
jeepinjeffrey
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4.56 or 4.88?

I am looking into re-gearing my 4.0L automatic 03 TJ sport. Right now I am running 3.73 with 33" brand new tires, With the 33's I have no power on the freeway and I am draining through my gas.
I plan to maybe go to 35's down the road in at least 5 years but i'm not sure I might stay with 33's, What do you guys think I should go with? and what are the plus and minus of running each with each size tires and what are your guys MPG re-geared with 33's and 35's with 4.56 and 4.88. Thanks


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post #2 of 67 Old 02-07-2012, 11:48 AM
Monster747
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I am running 37" with 3.07 gearing no issue on highway and excellent offroad.
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post #3 of 67 Old 02-07-2012, 11:50 AM Thread Starter
jeepinjeffrey
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Quote:
Originally Posted by Monster747 View Post
I am running 37" with 3.07 gearing no issue on highway and excellent offroad.
Do you have a manual? mines an auto

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post #4 of 67 Old 02-07-2012, 11:52 AM
bmw91
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I'm running 33s with 4.56 gearing and its pretty good on road and off. I'm getting about 14 in town, but highway I'm not completely sure. I might go to 35s this summer and I think it'll still be fine regardless.
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post #5 of 67 Old 02-07-2012, 11:54 AM
bmw91
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and obviously monster was kidding. I had 3.07 for a while and it was awful with 33s.I have a manual transmission btw
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post #6 of 67 Old 02-07-2012, 11:54 AM
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33's with 4.10's 5speed and it's like stock for me. I have read a lot here that for the auto you'll want 4.56 for 33's...

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post #7 of 67 Old 02-07-2012, 11:56 AM
Mattc
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I had a auto tj on 35s with 4.88s it was great off-road but on the highway it was tacking pretty high rpms at 70mph. I would say that if you dd your tj and still do a good amount of highway driving go with 4.56s but if you only drive around town and wheel it go with 4.88s
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post #8 of 67 Old 02-07-2012, 12:01 PM
Mattc
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Quote:
Originally Posted by Monster747 View Post
I am running 37" with 3.07 gearing no issue on highway and excellent offroad.
Thats hard to believe..are you sure you have 3.07 gears your specs say you have an auto most came with 3.73s in 2000
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post #9 of 67 Old 02-07-2012, 12:05 PM
chevy2169
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Quote:
Originally Posted by Mattc

Thats hard to believe..are you sure you have 3.07 gears your specs say you have an auto most came with 3.73s in 2000
Hes kidding...

Some say a comet will fall from the sky.
Followed by meteor showers and tidal waves.
Followed by faultlines that cannot sit still.
Followed by millions of dumbfounded dip****s.
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post #10 of 67 Old 02-07-2012, 12:25 PM
Knuckelhead
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Go with 4.88's for your 03 Sport.
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post #11 of 67 Old 02-07-2012, 12:34 PM
TJDaveX
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Quote:
Originally Posted by Mattc View Post
I had a auto tj on 35s with 4.88s it was great off-road but on the highway it was tacking pretty high rpms at 70mph. I would say that if you dd your tj and still do a good amount of highway driving go with 4.56s but if you only drive around town and wheel it go with 4.88s

Quote:
Originally Posted by Knuckelhead View Post
Go with 4.88's for your 03 Sport.
This^

I have 4.88's on my 04 auto and 35" tires. With my D30 up front, I would prefer 5.13's or even 5.38's. But, I'm stuck where I'm at for the moment.
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post #12 of 67 Old 02-07-2012, 12:50 PM
Monster747
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Quote:
Originally Posted by Mattc View Post
Thats hard to believe..are you sure you have 3.07 gears your specs say you have an auto most came with 3.73s in 2000
My came stock with 29" tires and D30/35 with 3.07. So I switched to 31", 33", 35" and now 37" finally I am happy. Its an auto.
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post #13 of 67 Old 02-07-2012, 12:53 PM
Moto4x4
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4.88s 35s and a 6 speed manual fwiw
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post #14 of 67 Old 02-07-2012, 01:13 PM
k6usy
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Here is a good reference: http://www.jeep4x4center.com/jeep-ti...atio-chart.htm

And when you need to change your speedo gear: http://www.jeep4x4center.com/jeep-sp...ears/index.htm

I have 31s with a 3.73 gearing (i6 auto); mine runs great on the freeway.

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Check out my forum: http://k6usy.net
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post #15 of 67 Old 02-07-2012, 01:39 PM
Wheelin98TJ
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4.88.

You can run low axle gears and still turn reasonable RPM on the highway because your auto tranny has a tall OD ratio (0.69).

If you were to do 4.56, you're tranny will be shifting in and out of OD on the highway everytime you hit a slight incline or catch a draft from a semi.
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