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Old 11-17-2018, 10:53 AM
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Better to have 35 spline in front or rear??

Hi guys, 2012 JKU Sport here. I am building a TERA44 right now to put in the front. I currently have the rear locked with an ARB RD117 30 spline locker. I have purchased the ARB RD147 35 spline locker for the new front axle.

QUESTION:

Should I run the 35 splines up front, or swap the lockers and run the 35 spline in the rear and 30 spline up front? Any reasoning as to why?

I will be buying new chromo shafts for BOTH axles soon and so that's also why I am asking.

Thanks!

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Old 11-17-2018, 11:34 AM   #2
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Ok, here is my take on it. 35 spline is stronger. But stronger is not always better as it moves the weak point to the ring and pinion. You can carry a spare shaft and fix it on the trail. Not so true of the ring and pinion. But if you don't wheel like a mad man, or run crazy sized tires, you likely will not break either. Ideally you want more strength in the rear so if shuffling the 30 to the front and 35 to the back is an option, I would do that.

Just double check that the tera44 is designed for the carrier of a non Rubicon version of the d44. Or unless arb has optional kit to adapt the non rubi carrier to a rubi setup you will not be able to swap them around. Also be extra careful when ordering the shafts. They are different lengths for rubi vs non.

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Old 11-17-2018, 12:16 PM
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Originally Posted by fuzzylogic_y2k View Post
Ok, here is my take on it. 35 spline is stronger. But stronger is not always better as it moves the weak point to the ring and pinion. You can carry a spare shaft and fix it on the trail. Not so true of the ring and pinion. But if you don't wheel like a mad man, or run crazy sized tires, you likely will not break either. Ideally you want more strength in the rear so if shuffling the 30 to the front and 35 to the back is an option, I would do that.

Just double check that the tera44 is designed for the carrier of a non Rubicon version of the d44. Or unless arb has optional kit to adapt the non rubi carrier to a rubi setup you will not be able to swap them around. Also be extra careful when ordering the shafts. They are different lengths for rubi vs non.
Great reply. The axle I am building is the non-rubicon version, part # 3544253. Based on my research it will take either the 35 spline RD147 or the 30 spline RD117. The Rubicon housing should take the RD157.

I tend to be more of a finesse-style wheeler, light on the skinny pedal. Even through the hard stuff I'd rather take my time vs. muscle my way through/over.

I just want to make sure I'm using the lockers and shafts in the best places. I'm leaning heavily towards putting the RD147 35 spline in the rear and the RD117 30 spline in the front. I guess I'm looking to see if someone has another take on why I should have the 35 spline in the front.
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Old 11-17-2018, 12:42 PM   #4
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Quote:
Originally Posted by WineCountryWheeler View Post
Hi guys, 2012 JKU Sport here. I am building a TERA44 right now to put in the front. I currently have the rear locked with an ARB RD117 30 spline locker. I have purchased the ARB RD147 35 spline locker for the new front axle.

QUESTION:

Should I run the 35 splines up front, or swap the lockers and run the 35 spline in the rear and 30 spline up front? Any reasoning as to why?

I will be buying new chromo shafts for BOTH axles soon and so that's also why I am asking.

Thanks!


So I offer this as a possible solution. I did the same thing a year ago. Built a Tera 44 housing 35 spline RCVs, ARB, High steer knuckles, Dynatrack ball joints for my JK.



But as you, I had an ARB in the rear with 30 spline Chromoly axles and wanted to upgrade. I sold the axles for $350 and used the money to purchase the following ARB PN: ARB728H031. It is the internal parts needed to convert your 30 spline ARB to 35 spline. I still spent another $600 for a set of G2 Gold Placer axle shafts but now I was 35 spline front and rear.

People will say that this moves the weak point to the gear set and there is some truth to this but I have built 75 or more sets of Jeep axles for people that both daily drive and beat the crap out of them off road. I have yet to see a broken set of JK (this is important) Dana 44 gears.
The JK Dana 44s are not the same as the old Dana 44s. They actually almost named it a Dana 48 because of all the changes they made but held onto the 44 for some reason. Bigger and thicker ring gears, larger pinion shafts and larger bearings, many changes made to the housing to increase rigidity. It is a much stronger and improved axle over the old Dana 44s. Failures are not that common. Not saying they never happen just not common. I wouldn't shy away from 35 spline axles worrying about your ring and pinion unless you are captain "When in doubt POWER OUT" of obstacles.

I also built a rear housing with all Artec HD brackets and positioned everything for my 4 inch lift with the correct pinion angle, Spring perch position and track bar location at the same time. It's funny but it also improved the suspension articulation a bit. I think turning the stock housing causes a little bind in the control arms maybe near full flex?



Good luck with your project.
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Old 11-17-2018, 12:45 PM   #5
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When i built my Core 44 front, i went with 35 spline RCV axles. My thought process was that i wanted the front to be as strong as i could make it. I also wanted to eliminate the u joint bind. I have a 1310 driveshaft, I am hoping that this is my weak point. Replacing a u joint in a driveshaft is my preferred fix and i hope that if it ever plays out, thats what will break. I also really didnt want to redo the rear as i also have a 30 spline ARB in the rear. ARB is really proud of the 35 spline conversion to the for their 30 spline locker. I upgraded the rear shafts to Revolutuon Chromolys.

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Old 11-18-2018, 09:59 AM
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@RichL35 That's awesome, I had no idea that ARB made a conversion kit for 35 splines into an RD117. I may end up doing that before the big install day next Spring.

@cranbiz Yeah that's a good point about making the u-joint the weak link. Probably the easiest thing to fix on the trail in a pinch.

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Old 11-18-2018, 04:34 PM   #7
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So the Tera44 housing you bought has SAE bearings like the rear JKD44 non Rubi?


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Old 11-18-2018, 04:45 PM   #8
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Quote:
Originally Posted by WineCountryWheeler View Post
@RichL35 That's awesome, I had no idea that ARB made a conversion kit for 35 splines into an RD117. I may end up doing that before the big install day next Spring.



@cranbiz Yeah that's a good point about making the u-joint the weak link. Probably the easiest thing to fix on the trail in a pinch.





In theory yes, I tried that theory, didn’t work so well for me. however, I snapped both axle shafts off at the splines because that was that particular brand axles weak point. Not a trail fix, as a matter of fact I would have been better off if it were the ring and pinion. I still had to pull the carrier and fish out all the axle pieces from my OX locker. Those axles were replaced with 30spline RCV axles no looking back 160,000klm later, still going strong.. I have no issues staying with 30 spline if the axles are good quality.


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Old 11-19-2018, 02:38 PM
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Originally Posted by JTPhoto JK View Post
So the Tera44 housing you bought has SAE bearings like the rear JKD44 non Rubi?


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As far as I know. I went right off the PDF fact sheet for the Tera44.
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