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Old 01-20-2014, 11:06 AM   #1
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Dana 30 questions

I have a 2012 JK automatic. I have purchased 5:13 gears and an arb locker for the rear. Before the install I have decided to lock the Dana 30 front. While thinking of this I am considering going to 30 spline instead of 27 spline in the front.

I currently run 35's and will be going 37's after the gear install to hit the sweet spot for the 5:13 gears.

Thoughts...

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Old 01-20-2014, 07:34 PM   #2
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I would add gussets for your "C"'s and a truss kit. Also you could check out RCV shafts.

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Old 01-20-2014, 07:52 PM   #3
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Artec front armor it .. 250 can't be beat IMO
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Old 01-20-2014, 08:23 PM   #4
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Trusses. Good call. That is a def but down the road.
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Old 01-20-2014, 08:41 PM   #5
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Any benefit to a truss over a sleeve or vice versa?
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Old 01-21-2014, 09:24 AM   #6
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If you are going to do all of the above; you just as well replace the junk factory ball joints at the same time.
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Old 01-21-2014, 09:57 AM   #7
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I know. The list keeps growing and the parts are piling up. I dont want to half a** it and regret it later but I want it in my Jeep already.
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Old 01-21-2014, 12:00 PM   #8
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Purejeep.com sells gusset and truss kit for half the price of the artek.
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Old 01-21-2014, 12:20 PM   #9
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Going 30 spline increases the chance that you will break the ring and pinion before the axle shaft.
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Old 01-21-2014, 12:30 PM   #10
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is that because more teeth from the shaft touch the ring an pinion?
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Old 01-21-2014, 02:11 PM   #11
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I've run 37s on a D30 and had no issues but I was always aware and careful. If you are going to beef up your axle with armor, gussets and trusses it sounds like you are in for some tough wheelin'.

If you want to push the D30, I would stay with the 35s. The extra mass and radius of the 37s may ruin your off road adventure.
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Old 01-21-2014, 03:42 PM   #12
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Any benefit to a truss over a sleeve or vice versa?
yes, a truss will actually strengthen the housing. most catastrophic failures occur when the tube breaks the cast housing where the tube and housing meet. sleeving does nothing to prevent this.
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Old 01-21-2014, 04:15 PM   #13
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yes, a truss will actually strengthen the housing. most catastrophic failures occur when the tube breaks the cast housing where the tube and housing meet. sleeving does nothing to prevent this.
Ahh i see. Can you sleeve AND truss?? That would seem like the thing to do if you got it apart already.
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Old 01-21-2014, 05:09 PM   #14
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Ahh i see. Can you sleeve AND truss?? That would seem like the thing to do if you got it apart already.
absolutely. might be a tad overkill but you sure as hell wont break a housing or tube.

might as well get some outer seals while you are at it.

http://www.4wheelparts.com/Drivetrai...+30+Reverse+JK

oh, excellent time to do balljoints too.
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Old 01-21-2014, 07:04 PM   #15
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absolutely. might be a tad overkill but you sure as hell wont break a housing or tube. might as well get some outer seals while you are at it. http://www.4wheelparts.com/Drivetrai...+30+Reverse+JK oh, excellent time to do balljoints too.
Awesome. Im trying to further my education with axles thank you for answering! With all this being done though im guessing the weak point on the 30 is now the axle shafts right? Even chromoly, the 30 is only so thick right?
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Old 01-21-2014, 07:26 PM   #16
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not a fan of the outer seals. they really don't do much at all. I suppose if you're submerged in water a lot... but what they keep out they also keep in once it creeps past the seal.

far as the truss/sleeve.without question sleeve first. truss reinforces the axle housing for sure... but I'd rather reinforce the axle shaft as well, so my failure is more likely a u-joint and not the shaft itself.

tab if you're looking to build the axle (sleeve and c's, and truss) you might just want to look at a TeraFlex Dana 30 housing. as I said. ball joints and the stress on the inner c from the weight of 37s are my weak point. and I'd say I wheel it somewhat frequently...

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Old 01-21-2014, 07:29 PM   #17
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The weak part will be most likely be the R&P.
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Old 01-21-2014, 07:32 PM   #18
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The weak part will be most likely be the R&P.
^^ hands down. till you regear it.
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Old 01-21-2014, 08:49 PM   #19
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I did buy the outer seals also since it would all be apart. Still not sure about 27 or 30 spline?
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Old 01-21-2014, 08:56 PM   #20
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not a fan of the outer seals. they really don't do much at all. I suppose if you're submerged in water a lot... but what they keep out they also keep in once it creeps past the seal.

far as the truss/sleeve.without question sleeve first. truss reinforces the axle housing for sure... but I'd rather reinforce the axle shaft as well, so my failure is more likely a u-joint and not the shaft itself.

tab if you're looking to build the axle (sleeve and c's, and truss) you might just want to look at a TeraFlex Dana 30 housing. as I said. ball joints and the stress on the inner c from the weight of 37s are my weak point. and I'd say I wheel it somewhat frequently...

sleeving doesnt reinforce the shaft, just the tube. breaks happen because of the twisting applied to the shaft and more often than not it snaps off right at the splines, nowhere near the sleeve

I can somewhat agree with you on the seals, but believe me, once mud goes into a non sealed axle it isnt coming out. it hardens on the bottom and sits there until you try to put your shaft back in, which pushes a little into the housing. I had to use a coat hanger for an hour to clean mine up before shoving it back in
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Old 01-21-2014, 08:58 PM   #21
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I did buy the outer seals also since it would all be apart. Still not sure about 27 or 30 spline?
you locking it?
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Old 01-21-2014, 09:01 PM   #22
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^^ hands down. till you regear it.
its debatable, 3.21's are thicker than 5.13's but when you factor in that it is a lot easier to turn 5.13's....

a buddy insisted on running 3.21's so he didnt blow up his R&P, he never broke it. broke everything else though. drove like ass on 37's
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Old 01-21-2014, 09:02 PM   #23
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sleeving doesnt reinforce the shaft, just the tube. breaks happen because of the twisting applied to the shaft and more often than not it snaps off right at the splines, nowhere near the sleeve

I can somewhat agree with you on the seals, but believe me, once mud goes into a non sealed axle it isnt coming out. it hardens on the bottom and sits there until you try to put your shaft back in, which pushes a little into the housing. I had to use a coat hanger for an hour to clean mine up before shoving it back in
I haven't seen a break that close to the carrier. most times it's the u-joint anyhow. I know it reinforces the tube... maybe it's a mental thing to me... sleeve just makes more sense to me.

far as mud. I stay far away from mud. prefer to spend my time in the rocks. I inspect the dust shield around the axle... if you're keeping an eye on that... it's about the same as those seals - again IMO.
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Old 01-21-2014, 09:10 PM   #24
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you locking it?
Yes. Arb front and rear.
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Old 01-21-2014, 09:19 PM   #25
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Yes. Arb front and rear.
nice. 27 spline should be fine.. but 30 spline removes all doubt in the shaft. just remember you want some sort of fuse... otherwise your carrier or ring and pinion will go.. and as you know that gets expensive.
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Old 01-22-2014, 05:39 AM   #26
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I haven't seen a break that close to the carrier. most times it's the u-joint anyhow. I know it reinforces the tube... maybe it's a mental thing to me... sleeve just makes more sense to me. far as mud. I stay far away from mud. prefer to spend my time in the rocks. I inspect the dust shield around the axle... if you're keeping an eye on that... it's about the same as those seals - again IMO.

27 spline chromoly d30 shaft. Broke right off at the carrier.



Stock shafts usually break at the joint because the ears deform and allow the caps to the u-joint to come out . I've seem jk front axles break with internal sleeves. They usually crack at one of the plug welds holding the sleeve in. The sleeves actually do very little when compared to a truss.
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Old 01-22-2014, 09:10 AM   #27
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27 spline chromoly d30 shaft. Broke right off at the carrier.


Stock shafts usually break at the joint because the ears deform and allow the caps to the u-joint to come out . I've seem jk front axles break with internal sleeves. They usually crack at one of the plug welds holding the sleeve in. The sleeves actually do very little when compared to a truss.
wow... well thankfully i haven't seen one snap at the carrier. with some luck i never will.
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Old 01-22-2014, 10:21 AM   #28
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Nice break!

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