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Discussion Starter · #1 ·
Last week i bought a 9 inch from an 81 F150. It is 31 spline. I have seen 35 spline Powertrax No-Slips, and i have to get Moser to custom make me some shafts anyway to accomidate for the bolt pattern difference, so do i just throw 35 spline shafts in there? I have been searching this and both the 31 and 35 spline are 1.5 inch shafts, so i don't think that i would have to do anything to the housing. I could be wrong...anybody know.
 

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They are a bolt in thing once you put in the new locker.
 

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On my 35 slined 9" I used a strange spool and nodular centersection with larger bearing journals.

You might have to do the same thing with the centersection.
 

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the 31 spline axles are plenty tuff ya prolly dont need to go 35. i tried to break the 31s for a while but all i ever broke was driveshafts and u jionts and a yoke once.
 

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You have to have the big bearing 3rd member. You cant just put it into the 31 spline 3rd member unless it has the 3.25 bearings. I went with 31 spline because of this. Hell if I am going to go 35 spline might as well spend to go HP also. The new 3rd member to support the larger 35 spline will cost you almost as much. just my .02 worth.

BlueYJ <IMG SRC="smilies/glasses.gif" border="0">
 

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Discussion Starter · #6 ·
Thanx guys..i might just stay with 31 spline until ishatter one. I think that only the 9"s out of the Broncos have the different size bearings and bolts..am i correct??
 

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Yeah the broncs have the small, and large bearings, and the two different size "end bolts".Don't know waht else would.
FYI If anyone cares,DD has small bearing 31 splines that will work in the small bearing housing. Obviously then you need to upgrade everything else as well so it gets pricey.

My 2 cents is that the 31 spline are plenty tough.
From what I gather housing flex, and application of power simultaneously, (depending on your housing) seems to be the culprit in most of the axle shaft breaks anyway.

Anyone have a definitive word on that?
MJ
 

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Usually a 35 spline axle requires a different third member for the larger bearings. Mark Williams racing has a spool and house axles that retain the bearing size for 35 spline axles to work in a stock third member.
 

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It's not just a matter of having the BB case you also have to have the nodular center section...but another place that has 35 spline stuff that works in a stock center section is Randys R&P (if you care to do business with them) moser also make 33 spline axles that work in the stock center section so you get a little more beef without the cost of a new center section <IMG SRC="smilies/biggrin.gif" border="0">
 

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The 31 and 35 spline shafts to not have the same diameter. The 35 is noticably larger. I dont know how you could install a 35 spline powertrax side gear replacement locker in the stock carrier...the 35 spline shaft wont even fit through the hole. Id say spend the extra $330 for a 3.25 nodular case, and get the 35 spline shafts.
 

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You have to get the housing machined out to the bigger bearing size for the 35 spline.

Moser did it for me for $150.

DS

BTW - If you want to run an ARB - forget it. They dont make em for the 35 spline 9" yet.

[ 09-30-2001: Message edited by: DippStick ]
 
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