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Old 03-20-2011, 06:22 PM   #1
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dana 30/35 gears

Got a question for everyone. I am going to be getting new gears for my 1997 tj. Its a four cylinder 5speed. I have 33s with a 4in lift. Right now I can't hit 5th gear at all and I am getting about 10mpg. I know the stock dana 30 and 35 have 4.10 gears. I was looking around and found 4.56 gears and 4.88 gears for it. Wanted to know what ones i should get to get my gas mileage back. Also was thinking about getting a Aussie locker for the front.....

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Old 03-20-2011, 06:30 PM   #2
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Due to your 2.5L four-banger, you definitely need to regear to 4.88 for 33" tires. That engine needs the 4.88's slightly higher rpms than 4.56 would provide to truly compensate for the bigger and heavier 33" tires. Don't even consider 4.56 like would be appropriate if you instead had the 4.0L six cylinder engine.

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Old 03-20-2011, 06:31 PM   #3
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I would but those 4.10s off you of you...
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Old 03-20-2011, 06:35 PM   #4
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Used gears aren't the bargain they appear to be. The reason being is that it takes more time to set up used gears so if anything, an installer might even charge more to install used gears. They are harder to set up because they have already been work hardened in a precise location on the gear's surface so the installer has to get the gears back in the same exact position they were before which is time consuming. Gears are only about half of the cost of regearing, often even slightly less than half the cost, labor is the rest of it.
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Old 03-20-2011, 06:37 PM   #5
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I would but those 4.10s off you of you...
They're probably 3.07's. IIRC, only rubi's come stock with 4.10's. If he had a 44 rear, they'd be 3.73's. Not 100% on this, but pretty sure.
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Old 03-20-2011, 06:38 PM   #6
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They're probably 3.07's. IIRC, only rubi's come stock with 4.10's. If he had a 44 rear, they'd be 3.73's.
2.5L four-banger engines come with 4.10 gearing when the transmission is the 5-speed.
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Old 03-20-2011, 06:39 PM   #7
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2.5L four-banger engines also come with 4.10 gearing.
And this is why we have Jerry Bransford here. I've literally never seen anyone as knowledgeable about jeeps.
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Old 03-20-2011, 06:45 PM   #8
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Due to your 2.5L four-banger, you definitely need to regear to 4.88 for 33" tires. That engine needs the 4.88's slightly higher rpms than 4.56 would provide to truly compensate for the bigger and heavier 33" tires. Don't even consider 4.56 like would be appropriate if you instead had the 4.0L six cylinder engine.

Thanks i was thinking the 4.88 because it is a 4 cylinder.
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Old 03-20-2011, 06:50 PM   #9
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And this is why we have Jerry Bransford here. I've literally never seen anyone as knowledgeable about jeeps.

I was thinking they were 4.10 but then you said about the other gears and then i thought i might be wrong and if i was i was going to look pretty stupid LOL.
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Old 03-20-2011, 06:57 PM   #10
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how about the Aussie locker any ideas on that?
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Old 03-20-2011, 07:00 PM   #11
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The Aussie works fine as a front locker, its only slight drawback is that it clicks while you make left or right turns. It's essentially the same locker as the Lockright. If you wouldn't like any clicking, pay about $100 more for the similar but quiet Powertrax No-Slip locker.
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Old 03-20-2011, 07:03 PM   #12
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The Aussie works fine as a front locker, its only slight drawback is that it clicks while you make left or right turns. It's essentially the same locker as the Lockright. If you wouldn't like any clicking, pay about $100 more for the similar but quiet Powertrax No-Slip locker.
Cool thanks i will have to think about that.

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