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Old 03-29-2006, 09:24 AM   #1
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30 spline?

I have an 05 tj, 3.73, 30 in front, 44 in rear. I want to put lockers on and have been looking at OX or ARB. How do I tell if I have 27 or 30 spline without opening and counting?

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Old 03-29-2006, 10:28 AM   #2
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According to this website, your Dana 30 has 30 spline if you have 3.73 gears. Check it out.

http://www.4wheelparts.com/4wp/produ...etrain&man=ARB

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Old 03-29-2006, 01:16 PM   #3
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Thanks. . . then that means my 44 rear has 30 spline too, right? Because they gotta match. . . .?
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Old 03-29-2006, 04:21 PM   #4
coilovers are damn flexy
 
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sounds logical to me.
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Old 03-29-2006, 04:59 PM   #5
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Uh, Your Dana 30 is not going to have 30 splines shafts in it stock from the factory. It's going to be 27 spline shafts. Only the Rubicon 44 model has factory 30 spline shafts in the front.

What that site is referring to is the carrier break over point. With 3.54 and down you have one carrier/locker and for 3.73 and up you have a different carrier/locker. If you read down a little further on the site you provided then you will see the Dana 30 -27 spline 3.73 and up ARB option. What that site is referring to when referencing Dana 30 - 30 spline is for what is called Super 30 kits which upgrade your shafts to 30 spline from 27 and offer a new locker.

But the information is correct about the rear 44. It is 30 spline from the factory.
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Old 03-29-2006, 05:03 PM   #6
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so I probably have 27 in front, 30 in rear? What this is all about is that I need to decide if I'm regearing before I get lockers. It would only make sense to do it all at once. . . I'm kinda inclined to got to 4.10 anyway. . . Just gotta be sure.
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Old 03-29-2006, 05:08 PM   #7
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Unless you have a Rubicon and you bought your jeep from the dealer you have 27 spline shafts in the front and 30 in the rear. However I personally don't think there is enough of a performance gain to go from 3.73 to 4.10 to justify the cost. If your going to do it might as well head to 4.56 at least.
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Old 03-29-2006, 06:57 PM   #8
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thanks for the advice. . . I guess I'd better look at it closer. Another concern is that it's also a daily driver and I have to weigh the performance against the loss in fuel economy. I only get 14 now. . .
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Old 04-01-2006, 10:49 AM   #9
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Couple of thoughts...
IF you stick with the 27 spline you can use your take outs as spares. The 30's are a little tougher but the weak point is probably the yokes on the u joints and not the axles.

That said, I threw caution to the wind... I've got the ARB, Superior Super 30 and Super 44 with 4.88s on order. There is a back long on the Super 30s right now. I wan't something I don't have to do a lot of worring about when I upgrade to 35" tires. I'm running 33" now.
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Old 04-03-2006, 06:36 PM   #10
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Quote:
Originally Posted by Gerg
Couple of thoughts...
IF you stick with the 27 spline you can use your take outs as spares. The 30's are a little tougher but the weak point is probably the yokes on the u joints and not the axles.

That said, I threw caution to the wind... I've got the ARB, Superior Super 30 and Super 44 with 4.88s on order. There is a back long on the Super 30s right now. I wan't something I don't have to do a lot of worring about when I upgrade to 35" tires. I'm running 33" now.
With that being said you might as well upgrade your u-joints at the same time to CTM's or something. With the upgraded shafts the ears won't really be a problem. The problem you are going to have is if you break something you are breaking a part that is not 100% readily accessible with anyone your wheelin with or at the local off road shop. You are going to have order new ones. If you stick with stock then you have a lot better chance getting home from the trail and finding a replacement right away.

Remember nothing is bullet proof. You just have to minimize the damage and the down time.

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