Gearing? - JeepForum.com

 
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post #1 of 10 Old 06-23-2013, 12:20 PM Thread Starter
mkwilkerson40
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Gearing?

I have a 2005 wrangler unlimited automatic and I am having a 4 inch lift kit and 33 inch tires installed in the near future what or should I change the gear ratio too it its my daily driver and what tires are good for rock and a very small amount of mud I drive this everyday and want the best of both worlds

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post #2 of 10 Old 06-23-2013, 03:09 PM
Evildriver-3
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Which trans do you have or od ratio, depending on that you may want 4.1 or 4.5

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post #3 of 10 Old 06-23-2013, 03:12 PM
biffgnar
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Quote:
Originally Posted by Evildriver-3 View Post
Which trans do you have or od ratio, depending on that you may want 4.1 or 4.5
An 05 auto will have a 42RLE. With that he'll want 4.88.

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post #4 of 10 Old 06-23-2013, 08:02 PM Thread Starter
mkwilkerson40
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I have 31s and it has trouble in od already so somewhere above 4.5
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post #5 of 10 Old 06-23-2013, 09:37 PM
Evildriver-3
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If you have the 42re like biff says then you have a .69 ratio and want to lean to the 4.8 then

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Less than 8 is like playing with half a deck
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post #6 of 10 Old 06-24-2013, 06:30 PM Thread Starter
mkwilkerson40
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Originally Posted by Evildriver-3 View Post
If you have the 42re like biff says then you have a .69 ratio and want to lean to the 4.8 then
Thanks for the info o had no idea and was thinking around 4.1 great site and great info love my jeep
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post #7 of 10 Old 06-24-2013, 08:58 PM
Beardog2654
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2004 Wrangler TJ

I am new to the wonderful world of Jeep. I bought a 2004 Wrangler with a 4 inch lift it has 33 inch tires, the straight 6 engine and 5 speed manual tranny. I am having serious issues with this rig on the highway, like any hill I come to that is very long or steep I have to shift down to 3rd gear and can maybe keep 35 mph. Forget using the 5th gear on anything but downhill or very flat surface.

My question is how much difference will it make if I change out the rear end gears? I am not a mechanic, as if you could not already tell, but would really like this rig to have a little, or a lot, more umph on the highway. I am not looking for a racer or anything but would like to be able to maintain highway speeds in at least 4th gear.

I live in CO so there are plenty of hills and trying to get over them on the highway at 30-35 mph is getting old. I really like the jeep for off road use so far just not so much for getting to thte places I off road.

Any help is greatly appreciated.
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post #8 of 10 Old 06-24-2013, 09:15 PM
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Quote:
Originally Posted by Beardog2654 View Post
I am new to the wonderful world of Jeep. I bought a 2004 Wrangler with a 4 inch lift it has 33 inch tires, the straight 6 engine and 5 speed manual tranny. I am having serious issues with this rig on the highway, like any hill I come to that is very long or steep I have to shift down to 3rd gear and can maybe keep 35 mph. Forget using the 5th gear on anything but downhill or very flat surface.

My question is how much difference will it make if I change out the rear end gears? I am not a mechanic, as if you could not already tell, but would really like this rig to have a little, or a lot, more umph on the highway. I am not looking for a racer or anything but would like to be able to maintain highway speeds in at least 4th gear.

I live in CO so there are plenty of hills and trying to get over them on the highway at 30-35 mph is getting old. I really like the jeep for off road use so far just not so much for getting to thte places I off road.

Any help is greatly appreciated.
You have 3.07 or 3.73 gears, could be either. 3.07 is pretty bad with 33" tires. 3.73 is a little better, but still not ideal.

4.56 would work well with your setup, or 4.88 if you think you will go to 35s someday.

Both front and rear ratios need to be changed.

How much of a difference it makes depends on what you have currently, 3.07 or 3.73. 3.07 to 4.56 is a major difference. 3.73 not as much, but still a big difference.
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post #9 of 10 Old 06-25-2013, 10:50 AM
Evildriver-3
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Quote:
Originally Posted by Beardog2654 View Post
I am new to the wonderful world of Jeep. I bought a 2004 Wrangler with a 4 inch lift it has 33 inch tires, the straight 6 engine and 5 speed manual tranny. I am having serious issues with this rig on the highway, like any hill I come to that is very long or steep I have to shift down to 3rd gear and can maybe keep 35 mph. Forget using the 5th gear on anything but downhill or very flat surface.

My question is how much difference will it make if I change out the rear end gears? I am not a mechanic, as if you could not already tell, but would really like this rig to have a little, or a lot, more umph on the highway. I am not looking for a racer or anything but would like to be able to maintain highway speeds in at least 4th gear.

I live in CO so there are plenty of hills and trying to get over them on the highway at 30-35 mph is getting old. I really like the jeep for off road use so far just not so much for getting to thte places I off road.

Any help is greatly appreciated.
I would instal 4.5 in yours with the 5spd, it's od ratio .78 and the 4.5 with 33's will put you at a decent rpm at 65, the 4.8 may be just a bit over if you like to cruise at 65mph.

.

1995 Jeep gc ltd, 2005 Jeep gc ltd , 71 Dart, 73 RR 440-6pk, 78 Mag GT, 85 Power Ram W-350, 92 Daytona, 99 Dakota, 08 Ram 2500

Less than 8 is like playing with half a deck
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post #10 of 10 Old 07-27-2013, 07:45 AM
Beardog2654
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Hey folks, I got the gearing changed in my 04 Wrangler. You were correct I had a 3.07 had a 4.10 put in at the advice of the guys at 4Wheel parts and what a change it has made. Driving the jeep now is so much more fun it just improved performance all the way around. Thanks for the advice and responses. Thanks to the forum as well.
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