Gear swap advice - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 11 Old 07-18-2010, 09:38 AM Thread Starter
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Gear swap advice

I've a 2007 unlimited jk. According to the door label It was *
manufactured in feb 2007. It has d44 in the rear and d30 in the front. *
I've 33s with 17in wheels. I have winch with aftermarket bumper and *
spare tire. Dont know the gear ratio that i have. My jeep is lack of *
power.i want to upgrade my gears but dont know what ratio i need. My *
jeep is automatic. I want a good balance between power and mpg. Some *
people recommend 4.88 other 5.13. I think 5.13 is too much for 33. *
Anyway please let me know which way to go. I am not planning to move to 35. I think 35 is to heavy for a d30.
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post #2 of 11 Old 07-18-2010, 10:05 AM
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If your not going any bigger than 33s I would stick with 4.88.

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post #3 of 11 Old 07-18-2010, 11:46 AM
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x2.

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post #4 of 11 Old 07-18-2010, 02:38 PM
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I have expirenced that most auto trannys guys do the 5.13, I have a 6 speed and I have 4.88s
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post #5 of 11 Old 07-18-2010, 02:43 PM
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once you get 33's you will want to go 35's

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post #6 of 11 Old 07-18-2010, 03:15 PM
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I had 4.10's being a Rubicon and it ran just fine with the stock wheels, but when I put on the BFG KM2 35's it was good in town but not on the highway and even worse when I pulled my camper. I recently went through this same dilema and I didn't believe that my engine would run well with 5.13's and debated going with 4.88's. I made the gear swap and went with 5.13's fortunately for me the gears didn't set up well and they were noisy. I got crazy and re-did the gears with 5.38's and I've got to tell you I couldn't be happier... even having to put more money into the gear swap. These little hamster engines that we have run their best at higher RPMs and now my rig has lots more power and the highway speeds are constant no more shifting in and out of OD. The fuel economy is right at 17MPG on the highway at 70MPH turning 2650 RPMs. Go with the 5.13's you won't regret it.

Just my .02 cents of course.

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post #7 of 11 Old 07-18-2010, 03:19 PM
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5.13 and don't look back
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post #8 of 11 Old 07-18-2010, 04:27 PM
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http://www.grimmjeeper.com/gears.html

Hey give this a look. If you are running 33 I would go with 4.56

Use the link to overthink this.

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post #9 of 11 Old 07-18-2010, 06:38 PM
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Your auto trans has such a deep overdrive that you can't possibly gear your Jeep too low. 5.13 is the lowest gears you can get for your Dana 30, and with 33" tires that is going to be just right. I've got 5.38 gears in my auto two door, with 35" tires, and I think it could stand to be geared even a little lower, if they made a lower gear set. These things are such DOGS that you need the low gears. You'll even get better gas mileage with lower gearing, because your tranny wont be downshifting to second gear every time you need to go over a freeway overpass.

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post #10 of 11 Old 08-05-2010, 04:47 PM
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Stuck in gear hell.

I have 33's on my 2dr 6 speed. I currently have the stock 3.21 gears and it's a dog, of course. I'm stuck between getting 4.10 or 4.56 gears. Does anyone have experience with this set up? Advice?
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post #11 of 11 Old 08-05-2010, 05:02 PM
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Quote:
Originally Posted by MOPWR2U View Post
Your auto trans has such a deep overdrive that you can't possibly gear your Jeep too low. 5.13 is the lowest gears you can get for your Dana 30, and with 33" tires that is going to be just right. I've got 5.38 gears in my auto two door, with 35" tires, and I think it could stand to be geared even a little lower, if they made a lower gear set. These things are such DOGS that you need the low gears. You'll even get better gas mileage with lower gearing, because your tranny wont be downshifting to second gear every time you need to go over a freeway overpass.
X2. Except I think there are some companies making 5.38's for the dana 30's now. I have 5.13's with an Auto and 37's. I am only running 2000 to 2200 RPM at 60 in overdrive. Make sure you run the VIN with the dealer and find out if you have 3.73's currently or 3.21's. Jeep actually put some 3.21's in the early 2007's and the carrier is different. You will have to change the carrier if you do not have the 3.73's.
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