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Old 09-14-2017, 10:53 PM
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What kind of usage requires building a Dana30 axle?

Moving onto 35" tires. KO2's - no intention to go for mud tires or 37's
The jeep is strictly an over lander / cross country. And eventually I am sending to Greece to be used 6 weeks out of the year when I visit.

My 2008 JKU 3.8L 4-speed auto has 3.73 gears. Dana 44 rear, Dana 30 front.

I'm likely going with a 44 differential on the front, with 5.13 gears on front and rear, and a locker (probably front). 5.13 because its mountainous

will my use really require building the axle or upgrading to Dana44?

I just watched a truss/gusset welding video and I wanted to cry.


I need opinions from members who have actually broken or bent axles.

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Old 09-15-2017, 08:37 AM   #2
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You won't find many who have broke/bent their 30, and they are usually hard core users.

As for building a 30, I wouldn't sink too much into it. Junkyard 60's are going to be better than a "built" 30 and you can get them for $250-400 complete. Another benefit is getting rid of ball joints, king pins are far superior IMO. If you can weld, that is the most economical route to take towards a really solid front axle.

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Old 09-15-2017, 08:40 AM   #3
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5.13's on the 30 will be a bigger issue than the 35's. That makes for a very small pinion gear, which is more likely to break. By the time you spend the money to have the front axle geared, locked, and trussed, you are almost to the cost of a replacement 44. You don't need to drop 5k+ for a ProRock, so look at the Spicer/Mopar Ultimate 44.
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Old 09-15-2017, 08:43 AM
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5.13's on the 30 will be a bigger issue than the 35's. That makes for a very small pinion gear, which is more likely to break. By the time you spend the money to have the front axle geared, locked, and trussed, you are almost to the cost of a replacement 44. You don't need to drop 5k+ for a ProRock, so look at the Spicer/Mopar Ultimate 44.


I've seen axles on the major seller's websites. If I go for a Spicer/Mopar, what ELSE do I need? Do those come with gears, r&p etc? What's a complete shopping list look like? (Obv besides the optional accessories like lockers)


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Old 09-15-2017, 09:01 AM   #5
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If I go for a Spicer/Mopar, what ELSE do I need? Do those come with gears, r&p etc?
Pretty sure they come with the gears and locker already installed. You just swap your stuff from the knuckles out from your 30.

Then you can gear and lock your rear 44 to match.
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Old 09-15-2017, 09:49 AM   #6
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Originally Posted by omfgitsniko View Post
I've seen axles on the major seller's websites. If I go for a Spicer/Mopar, what ELSE do I need? Do those come with gears, r&p etc? What's a complete shopping list look like? (Obv besides the optional accessories like lockers)


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Pretty sure they come with the gears and locker already installed. You just swap your stuff from the knuckles out from your 30.

Then you can gear and lock your rear 44 to match.
^this. But most have a higher spline count so you'll need new axle shafts too.
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Old 09-15-2017, 09:55 AM   #7
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^this. But most have a higher spline count so you'll need new axle shafts too.
I think the Ultimate 44 comes with shafts too.
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Old 09-15-2017, 09:58 AM
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^this. But most have a higher spline count so you'll need new axle shafts too.
So really, what I need as a "required" minimum is:

Dana 44 front axle
front axle shafts (shouldn't these be paired / from the same mnfg as the axle?)
correction of REAR gear ratio (stock dana 44, no way in hell im upgrading this)

And the optional features like lockers.
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Old 09-15-2017, 10:00 AM   #9
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I think the Ultimate 44 comes with shafts too.
cool, haven't really checked that one out. Nice that they come with shafts.
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Old 09-15-2017, 10:16 AM   #10
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Originally Posted by omfgitsniko View Post
So really, what I need as a "required" minimum is:

Dana 44 front axle
front axle shafts (shouldn't these be paired / from the same mnfg as the axle?)
correction of REAR gear ratio (stock dana 44, no way in hell im upgrading this)

And the optional features like lockers.
IMO for your tire size/use an aftermarket 44 is the way to go. 4.88 or 5.13 gears are too small for a D30.

So now you need to decide on which D44, apparently some come with shafts, some don't. If they come with shafts then use those. Top of the line would be RCVs, which don't bind like 1350 joints do. But RCVs may be overkill for your application. Make sure the spline count matches. LINK

Now to the back, the stock d44 in back is fine, but the gears will need to match the front. Also IMO the axle shafts are a weak point. You can wait until they fail then upgrade, or upgrade now. I went with a 4340 shaft from Revolution LINK

Edit: @SoDakSooner runs 35s on a D44 rear, he had to replace his rear axle shaft fairly quickly too.,
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Old 09-15-2017, 10:18 AM
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IMO for your tire size/use an aftermarket 44 is the way to go. 4.88 or 5.13 gears are too small for a D30.



So now you need to decide on which D44, some come with shafts, some don't. If they come with shafts then use those. Top of the line would be RCVs, which don't bind like 1350 joints do. But RCVs may be overkill for your application. Make sure the spline count matches. LINK



Now to the back, the stock d44 in back is fine, but the gears will need to match the front. Also IMO the axle shafts are a weak point. You can wait until they fail then upgrade, or upgrade now. I went with a 4340 shaft from Revolution LINK


So you kept the stock rear axle and upgraded the shafts?


FYI this will never see rock crawling. But it will see off-road trails


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Old 09-15-2017, 10:21 AM   #12
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So you kept the stock rear axle and upgraded the shafts?


FYI this will never see rock crawling. But it will see off-road trails


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Correct. I edited my post to tag sodaksooner, he stayed stock rear shafts and they didn't last very long before it left him stranded on a trail. He also went with the 4340 revolution rears. BTW it was a trail, not rocks that broke his shafts.
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Old 09-25-2017, 09:24 AM   #13
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Sorry, have been out of town.... Broke that shaft on nothing that was difficult. Just got high centered a bit and bounced some...snap!!
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Old 09-29-2017, 09:12 AM   #14
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You can get a dynatrac pro rock front D44 with the right gears for around $2k if you skip all the fancy upgrades. Then you can swap your knuckles and brakes over, which saves money. Then put gears in the stock rear D44 and you're all set. The JK D30 and D44 share the same knuckles, it's the gear set that's larger on the 44.
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