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Old 08-19-2010, 09:25 PM   #1
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Diff Gear Size

I have a 94 YJ with a 4.o liter 5 speed. I am running 33's and 3.07 gears in the rear diff. My question is what would be the best size gears to change to in the rear diff to give me more power but to also be able to use it as a daily driver. Also the best place to look for the gears online. I'm going to check with a couple of the four wheel drive shops in the area to see if they might have a used one. Any help will be appreciated.

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Old 08-19-2010, 09:34 PM   #2
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4.10s

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Old 08-19-2010, 09:45 PM   #3
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Toss up between 4.10 and 4.56....
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Old 08-19-2010, 10:07 PM   #4
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YJ Geers

You'll want 4.56.

4.56 gears are a great "off-road" Jeeping ratio. The difference between 4.10 and 4.56 on the Hwy is so close it's next to not mentioning.

They both have the same crappy Hwy. performance and fuel consumption.
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Old 08-20-2010, 05:18 PM   #5
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This one will be a daily driver so I was hoping to find a balance between offroading and driving on the hwy. Right now I'm getting neither. I had thought changing to 3.73 would get a better hwy driver than what I'm dealing with now and still give some added performance offroad.
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Old 08-20-2010, 09:42 PM   #6
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dbenn : "...hoping to find a balance between offloading and driving on the hwy."

I had that same Illusion "once upon a time."

You either have a serious Rig for off-road use, or a fuel conscience Jeep with stock tires for driving to the Mall.
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Old 08-20-2010, 09:47 PM   #7
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Get new gears not used., go with 4.10 o 4.56 and have them installed by some who has done a ton of installs.
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Old 08-20-2010, 10:04 PM   #8
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4.10
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Old 08-21-2010, 08:55 AM   #9
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Thanks for all the help. I guess I'll fix it with 4.10 and deal with the consequences on the road (fuel economy). I might as well start looking for lockers too. is there a recommended site to start pricing and looking.
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Old 08-21-2010, 09:06 AM   #10
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Quote:
Originally Posted by dbenn View Post
Thanks for all the help. I guess I'll fix it with 4.10 and deal with the consequences on the road (fuel economy). I might as well start looking for lockers too. is there a recommended site to start pricing and looking.

Well lockers ad another issues... the dana 35 and a locker is a time bomb. You will want to look into upgrading it to bigger shafts or swaping in another axle, such as a dana 44 or ford 8.8.
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Old 08-21-2010, 09:26 AM   #11
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Will these fit without any modification?
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Old 08-31-2010, 08:07 PM   #12
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depends on how much you want to spend....
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Old 09-04-2010, 04:40 PM   #13
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Thanks for all the info and advice. I think I'm going to hold off and try to pick up a stronger rearend. If I'm going to put money and time into this I might as well upgrade along the way to avoid future problems.
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Old 09-04-2010, 09:31 PM   #14
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It might be cheaper if you find the complete axles from a 4 cyl Wrangler. They came stock with 4:10s & would be easier to change out yourself. You can spend upwards of $800 to $1000 dollars on gears installed in 2 axles.

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