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  #1  
Old October 28th, 2012, 23:11
90xj_zach 90xj_zach is offline
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30 spline shafts/dana 30/gears

30 spline shafts require the 30 spline carrier. Does that also mean that the factory gears need to be replaced as well? Thanks.
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  #2  
Old October 28th, 2012, 23:16
cheapcherokee93 cheapcherokee93 is offline
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Re: 30 spline shafts/dana 30/gears

nope, the gears have nothing to do with the 30 spline carrier. just make sure your gears match the carrier break for the 30 spline carrier
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  #3  
Old October 28th, 2012, 23:31
90xj_zach 90xj_zach is offline
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Re: 30 spline shafts/dana 30/gears

Thank you sir! So now the question I ask myself is what about a broken shaft on the trail?! A 27 spline spare shaft is useless obviously. S.O.B.
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  #4  
Old October 28th, 2012, 23:36
go1lum go1lum is offline
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Re: 30 spline shafts/dana 30/gears

What tire size, axles, gears in the axles? Stroker, no stroker? Doubler? You get the point. More info on the rig and what makes you want/need 30 pline shafts?
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  #5  
Old October 28th, 2012, 23:54
90xj_zach 90xj_zach is offline
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Re: 30 spline shafts/dana 30/gears

29 spline 8.25. High pinion D30 with 297 u joints. 36" Iroks. Factory 3.55s (budget toy, they are clearly not ideal but the jeep has the power to turn them)
I've been wheeling 35" tires on dana 30's for 6 years with no problems. I would think at some point my luck would run out though, so lately I've really been thinking about trussing and getting some 30 spline shafts.
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  #6  
Old October 29th, 2012, 07:26
Serious Offroad Serious Offroad is offline
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Re: 30 spline shafts/dana 30/gears

30 spline shafts do provide a substantial increase in strength over stock 27 spline shafts but as you stated, the down side is the need for a spare 30 spline shaft. that's a damn expensive spare part to buy "Just in case".

Keep in mind that even if you do break a 30 spline alloy shaft (inner) you can leave the outer shaft in place and plug the axle tube with a rag to get yourself of the trail and back home again.

Same applies to a busted outer shaft, if it's just the ears that are broken/bent.
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  #7  
Old October 29th, 2012, 08:52
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clean4drxj clean4drxj is offline
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Re: 30 spline shafts/dana 30/gears

I wouldn't lock a 30 on 36 irocks, that will be the end of your shafts or R&P, I've seem it happen even with a geared axle.
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  #8  
Old October 29th, 2012, 09:04
Serious Offroad Serious Offroad is offline
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Re: 30 spline shafts/dana 30/gears

That's silly.

We've all seen shafts break with smaller tires and we've all seen folks run larger tires without any problems at all.
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  #9  
Old October 29th, 2012, 14:50
VAhasnoWAVES VAhasnoWAVES is offline
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Re: 30 spline shafts/dana 30/gears

consider the price of 30spline chromos... your in the ballpark for a set of 30 spline RCVs. now, your ring and pinion are DEFINANTLY going to be your weak link. a full case locker like an ARB or OX, truss, and stout diff cover will do a lot to help ring gear deflection, which is the biggest killer of D30 gears when running tires that big.

personally, i wouldnt gear a D30 to 4.88, id stay 4.56 to keep that 3rd pinion tooth in contact with the ring gear.

regardless, itd be a pretty bling 30, very polished turd.
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  #10  
Old October 30th, 2012, 08:40
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bobnoxious bobnoxious is offline
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Re: 30 spline shafts/dana 30/gears

No need for a spare shaft...your R&P will now be the weak link, especially if you go to 4.88 (well...maybe the Spicer 760 joint if you run that, but what's the point of upgrading to 30 spline shafts if not running a wonder-joint of some kind?).
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  #11  
Old October 30th, 2012, 15:02
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ocean_jet ocean_jet is offline
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Re: 30 spline shafts/dana 30/gears

Stock TJ D44 shafts can work as trail spares with a couple slight modifications...
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  #12  
Old November 3rd, 2012, 18:07
90xj_zach 90xj_zach is offline
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Re: 30 spline shafts/dana 30/gears

I appreciate all the replies, and for future searchers of this topic...I decided to buy a full width HP 44/Ford 9" combo, and build from there. I couldn't justify spending all that money on a dana 30. So I will be wheeling with a locked 8.25/open dana 30 as I gather the parts for the swap. Thanks fellas.
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  #13  
Old November 3rd, 2012, 18:27
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