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Unread 12-23-2012, 10:26 AM   #1
Pru-J
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30 spline chromos?

I have a 94 yj 4.0 stock motor. I want to change out the 27 spline with some 30 spline chromos off a TJ with a locker. One of my person jeep friends says I'll have too truss and sleeve my axle? Any help guys? TIA

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Unread 12-23-2012, 10:36 AM   #2
jbolty
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Depends on what your plans are. Personally I stayed with 27 because spares are readily available and you seldom see broken front shafts; normal the joints break first.

Not sure what the axle splines have to do with trussing. You can truss if you want, or not.
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Unread 12-23-2012, 10:43 AM   #3
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I just hope you're refering to the D30 and not the turdy 5.
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Unread 12-23-2012, 10:47 AM   #4
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Quote:
Originally Posted by RockWoRM
I just hope you're refering to the D30 and not the turdy 5.
Yes the 30 lol I hate that 35. Going to put a 8.8 back there once I'm stateside
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Unread 12-23-2012, 10:49 AM   #5
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Quote:
Originally Posted by jbolty
Depends on what your plans are. Personally I stayed with 27 because spares are readily available and you seldom see broken front shafts; normal the joints break first.

Not sure what the axle splines have to do with trussing. You can truss if you want, or not.
Well I'm going to have 38s on her when I get back stateside. Trying to make trailer rig out of her lol
image-414656284.jpg  
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Unread 12-23-2012, 10:56 AM   #6
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In that case go for it. Keep in mind 'if' you do break anything, it may be more expensive to replace since the 30 spline set up is custom. Also, as far as sleeving the 30. The only one I recall doing it on this board is Joe Dillard. But that was b/c he cracked a tube, which IMHO is rare. Of course, with 38's, a truss would'nt hurt. Good luck.



WRM
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Unread 12-23-2012, 12:00 PM   #7
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I run 30 spline axle shafts with an Arb locker and ctm ujoints. Nothing is going to break as long as i do not bind it up.
By tj shafts you mean no disco.?
I have also strengthened the tubes too.

A SUPER 30.
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Unread 12-24-2012, 09:16 AM   #8
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Originally Posted by jeepster93 View Post
I run 30 spline axle shafts with an Arb locker and ctm ujoints. Nothing is going to break as long as i do not bind it up.
By tj shafts you mean no disco.?
I have also strengthened the tubes too.

A SUPER 30.
Tom, did you sleve yours too? or something else?
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Unread 12-24-2012, 09:30 AM   #9
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Quote:
Originally Posted by RockWoRM View Post
as far as sleeving the 30. The only one I recall doing it on this board is Joe Dillard. But that was b/c he cracked a tube, which IMHO is rare. Of course, with 38's, a truss would'nt hurt. Good luck.



WRM
And Joe's old sleeved/trussed D30 is doing well under my rig now.

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Unread 12-24-2012, 10:48 AM   #10
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Quote:
Originally Posted by RockWoRM View Post
Tom, did you sleve yours too? or something else?
Sleeving it would be the best thing...
NOT what I did, of course. Would make too much sense for me to do it the right way.
So...
I took some left over steel(3/8 inch thick) and made this little ..."thing" that I welded over the tubes.
Does it help??? I have no clue except to say haven't bent them...yet.


Can see the little pieces I welded on the tubes here:
(That piece from the pumpkin to the disco on this side, shorter on the drivers side, but still a welded piece there.)



Here is another pic of a different project that shows a bit of how I welded and cut it to fit:
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Unread 12-24-2012, 11:27 AM   #11
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And Joe's old sleeved/trussed D30 is doing well under my rig now.
Nice it does the heart good to know that my old HPD30 is still doing some good.
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Unread 12-24-2012, 12:43 PM   #12
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Originally Posted by jbolty View Post
Depends on what your plans are. Personally I stayed with 27 because spares are readily available and you seldom see broken front shafts; normal the joints break first.

Not sure what the axle splines have to do with trussing. You can truss if you want, or not.
hmm ive broken shafts but never a ujoint. and i had the "small" ones.
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Unread 01-19-2013, 05:12 PM   #13
Pru-J
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Quote:
Originally Posted by fratis

hmm ive broken shafts but never a ujoint. and i had the "small" ones.
Yeah... I just broke my u joint the other day haha and unfortunately I'm overseas. I order the 1310 spicer hopefully my size isn't the 1330 because I do have the tom woods driveshaft
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Unread 01-19-2013, 05:20 PM   #14
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Ive twisted the splines on the stock shafts and the long side chromo which is also 27 spline. Also snapped a stub shaft. But So far I have not snapped the larger u joint.My breakage of the 27 spline stuff is very rare actually. Even though i would never drop the cash on a set of 30 spline shafts and locker for the Dana 30 I think that would make the setup pretty darn reliable with my 35s.

Still, 38s are too much for a Dana 30 in any configuration. Just my 2 pennies.
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