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Unread 10-29-2013, 07:55 PM   #1
Marinerider
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Broken Pinion

So I've searched the miracle of the internet high and low over the 5.13 vs 5.38 debate.

I have an JKU X so only a D-30 in the front. I've read all the articles and forum posts across the JK forums about how the pinion is smaller with the 5.38s and is prone to breaking.

Has anyone ever ACTUALLY busted the pinion, and if so is it attributed to being so small and potentially weaker inside the D-30?

I do mostly trails, and it's my DD (I deploy alot) so I'm not taking on the Rubicon anytime soon nor am I looking to upgrade to 37s. Just all that I've read from those with the 5.38s love them and I don't want to wonder what if I had only gotten 5.38s instead of 5.13s.

The shop quoted me the same price for both 5.13 and 5.38s so I'm at a decision point now.

Appreciate all the help and feedback,

Pete

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Unread 10-29-2013, 08:53 PM   #2
nixer600
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Just a thought, you should be able to search 5.38 Dana 30, that will open up the search to cj5 cj7 Yj tj and jk.

Maybe you already did this, just trying to help.

Is your auto or standard?
And what type of terrain you plan on being on?

My friend had the 5.13's in his auto jk and he liked it on the highway, but wished he had lower gears when off road in 4 high.


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Unread 10-29-2013, 08:56 PM   #3
nixer600
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I had Dana 30 cj7 4.56 and the contact point between the teeth on the ring and the pinion was so small I busted 1.75 teeth off coming down from a wheel stand. The pinion was fine, the ring gear busted the teeth.


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Unread 10-29-2013, 09:14 PM   #4
Marinerider
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Thanks for the feedback.

I'm an automatic. Terrain isn't too crazy. I'm moving in a year but not sure where so don't know what or where the terrain will be like.

Good call on opening up the search to other D-30s.

Pete
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Unread 10-30-2013, 02:03 AM   #5
SubAtomicGenius
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Most reputable gear manufacturers will not make 5.38's for the D30JK. I have held a 3.73 and a 4.88 pinion in my hand, and I would hate to see how small the 5.13's are - let alone a 5.38 for a D30JK. I'd say you can pick your teeth with a 5.38 pinion, haha!

This is why they make bigger axles - larger R&P sizes to handle bigger tires. I wouldn't do it, personally.

How big of tires do you plan on swinging on that D30JK, anyhow? Cause it sounds like there are going to be more issues than just a small pinion size...
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Unread 10-30-2013, 05:15 AM   #6
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I wasn't even aware that anyone made a 5.38 gear set for the Dana30, I thought the largest was a 5.13 and very few at that were producing those.

I would not go above a 4.88 in the d30, even if it is high pinion.
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Unread 10-30-2013, 05:22 AM   #7
ivester1992
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opening it up to tj, yj, and cj talk isnt going to help. their gears for their dana 30 stops at 4.88s.
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Unread 10-30-2013, 08:00 AM   #8
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This may be of interest--

I've had YUKON 5.38s in my Rubi Dana 44s, for over two years and in my first breakin run (20miles)--my rear diff reached 300F and thats without a great difference in pinion size, ie (D44-4.10/D44-5.38)--so

Thats one of the reasons that 5.38 gears are SCARCE for the dana 30, strength notwithstanding--

Just a point to ponder !

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Unread 10-30-2013, 08:11 AM   #9
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Well, I have 5.38's on 37's. No issues at all. Already been through a front driveshaft (twisted it in half like a candy wrapper), and snapped the left rear axle shaft, but no problems with the 5.38's pinion.

BTW, lead foot + supercharger while playing the rocks was the cause of those mishaps. After 3 hours of winching off the trail (the axle shaft and driveshaft happened within minutes of each other on the same trail), I learned that technique is more important than brute force.
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Unread 10-30-2013, 08:43 AM   #10
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I have a Rubi, so 44s f&r, with 5.38 Yukons. No issues. With D30 I'd be cautious going that low, but money towards a Pro Rock would be well spent.
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Unread 10-30-2013, 11:38 AM   #11
Marinerider
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Happy Trails,

I'm on my phone but I assume you have a Rubicon?

Sounding like the 5.13s. I'm staying at 35 in tires and putting a new front axle on isn't cheap at all.

Pete
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Unread 10-30-2013, 08:10 PM   #12
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Quote:
Originally Posted by Marinerider View Post
Happy Trails,

I'm on my phone but I assume you have a Rubicon?

Sounding like the 5.13s. I'm staying at 35 in tires and putting a new front axle on isn't cheap at all.

Pete
Yes, a Rubi. D44 front and rear.
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Unread 10-31-2013, 03:51 AM   #13
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OP was asking about a JK X with a D30JK axle and 5.38's - not D44s. If the OP had a D44, 5.38's would be an option.
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Unread 10-31-2013, 06:13 AM   #14
HappyTrails
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He was asking about 5.38 gears and the pinion, not D44 vs D30.
The only difference between a D30 and D44 is the differential housing size, no strength differences. So, my point is valid by speaking of 5.38's in a D44.
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Unread 10-31-2013, 06:23 AM   #15
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Quote:
Originally Posted by HappyTrails
He was asking about 5.38 gears and the pinion, not D44 vs D30. The only difference between a D30 and D44 is the differential housing size, no strength differences. So, my point is valid by speaking of 5.38's in a D44.
Umm no.

The ring and pinion on the Dana 44 is significantly larger, as well the rubicon 44s both feature larger main axle shafts and higher spline counts.

The only thing the jk44 and the jk30 share are tube size, inner and outer knuckles, outer shafts, ball joints bearings and brakes. Everything else is different.
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