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Old 01-23-2012, 05:58 PM   #31
InvertChaos's Avatar
Join Date: Sep 2010
Location: NoVa
Posts: 8,174
Originally Posted by calkid
If you plan to road your jeep any distance and have overdrive go 4.56 for 33" and 4.88 for 35" tires. You won't be sorry.
X2 for tthe 5/6 speed

|2004 Jeep TJ "Green Machine"|4.0L 5 speed Dana44|33x12.50x15 Goodyear Duratracs|2.5" OME HD coils + 1.25" body lift|OME NitroSport shocks|4.56 gears|Skid Row Engine Skid|BCC Sliders|Currie AntiRock|
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Old 06-11-2013, 12:30 AM   #32
Join Date: May 2012
Location: Mongolia
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dear all.

I have 285/70/17 tire. And I don't have any plan to upgrade bigger tire.

Now planning to re-gear my jeep. Should go for 4.10 or 4.56?
It's big decision for me. It's not about any money issue. i want to have normal and fine drive. I'm 80% town rider. 20% is quite adventurous off-roading.

Please advice, help and support me fellas.

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Old 06-11-2013, 12:31 AM   #33
Join Date: May 2012
Location: Mongolia
Posts: 23
Oh anyway, I ride 2011, JK Sahara 4Door, 4 trans. automatic.
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Old 06-11-2013, 12:46 AM   #34
Knows a couple things...

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Join Date: Nov 2005
Location: Escondido, Calif.
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This may surprise you but for that size tire (roughly a 33"), and with your 4-speed automatic, you want 4.88. Yes, 4.88. The 4-speed automatic has such a steep overdrive ratio, .69, that it reduces the highway rpms too much. I.E. it makes the highway rpms too low.. With that size tire, the engine would lug most of the time with 4.56 and would lug all the time with 4.10. With the 5-speed, 4.56 would be appropriate & with the 6-speed, 4.10 or 4.56 would be appropriate. But with your 4-speed 42RLE automatic transmission, don't even think about 4.10 or 4.56. 4.88 is ideal & will NOT produce excessive highway RPMs.

To give you a little more insight... my last TJ was stolen so I bought a used replacement with 4.88 gears, 35" tires, and the same 4-speed automatic you have. That 4.88 isn't enough gear for its 35" tires, it really needs 5.13 or better 5.38. The engine lugs with 35" tires and 4.88. But that same 4.88 would be ideal for your slightly smaller 33" tires.

When you have a choice, buy American.

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