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Old 08-18-2013, 10:35 PM   #1
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Front axel upgrade?

I have a Lj so I have a D44 in the rear and a D30 up front. Kind of asking and saying so please correct me if I'm wrong. I eventually want 35" tires. So I would think the D44 would be ok but I would need to upgrade the D30. I have read a lot about rear diff upgrades but I can't find much on the front. So what's the options?

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Old 08-19-2013, 09:22 AM   #2
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unless you are going to 35's or bigger the 30 will be just fine, re geared of course.

30 will handle 35's on road, but off the 30 along with a locker you'll stand a decent chance snapping an axle.

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Old 08-19-2013, 09:26 AM   #3
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Tons of guys run 35's on locked Dana 30's and have never had issues. I think you will be fine. The Dana44 as you mentioned will also be fine with 35's. Regearing will be a good option to consider though.
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Old 08-19-2013, 10:04 AM   #4
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The D30 is up to 35" tires but once you combine that big of a tire with a locker, then it's time to start looking for aftermarket hardened alloy 27 spline axle shafts. Once that upgrade is done, then it should hold together for even difficult trails. Good direct replacement u-joints to upgrade with that are stronger and more durable would be the Spicer 5-760x.
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Old 08-19-2013, 08:36 PM   #5
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That sounds great. If I do a locker I will just do a rear. I think 35s will be my next tire. I will regear. Speaking of regear. I had my jeep up on jack stands and with one rotation of the tire I got about two rotations of my driveshaft. I couldn't find the thread I saw that tells you what gears you have based on that test.
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Old 08-19-2013, 08:38 PM   #6
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Precisely two revolutions of a wheel with both wheels off the ground will rotate the driveshaft a number of times to equal your axle ratio. Your axles came with 3.73 from the factory.
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Old 08-19-2013, 09:46 PM   #7
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Ok thanks. I bought the jeep used and it had a junky lift on it. It think
It had big tires I don't know. The dealer
I got it from put new 30" tires on it.

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