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Old 28-11-2013
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Quote:
Originally Posted by MightyMouse View Post
An often overlooked fact is that an axle acts as a torsion bar and is designed to twist ( and obviously rebound ) when loads are applied reducing the shock loadings on the diff. Outright strength isn't the only design criteria

A good axle is elastic as well.

I'm sure the axle makers know their stuff and a 35 spline JK axle has the correct characteristics - so just adding this as information.
It is relatively well known that a 35 spline axle is not ideal on a std D44 (not new generation JK44). It became available because 35spline 9" ARB side gears swap straight into a D44 ARB. All that was needed was to make some 35 spline D44 shafts.Many people still think bigger is better and the axle manufacturers are happy because they will never have to warranty a 35 spline D44 shaft as the ring and pinion will almost always fail first.

The new gen JK44 ring and pinion is rated as 44% stronger than a std D44 so 35 spline shafts may have adequate torsional give before ring and pinion failure however I was advised to go for 32 spline chromo axles on a JK44gearset or 35 spline shafts cut down to approx 32 spline diameter for the majority of the shaft to produce more torsional give.

I'm no expert but the people my info comes from are pretty knowledgable on this stuff.

Obviously axle material plays a big part in axle characteristics to but to my knowledge most (all?) aftermarket axle manufacturers do not change materials for D44 30,32,33 or 35 spline axles.
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Old 28-11-2013
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Ok that shed some light on it.
Ford 9 splines are cut at 90 degrees also.
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Old 28-11-2013
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Quote:
Originally Posted by mika View Post
The new gen JK44 ring and pinion is rated as 44% stronger than a std D44
I would say the new style ring and pinion have improved in the torsional durability for sure. Not convinced on 44%.
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Old 28-11-2013
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Quote:
Originally Posted by TOYROX View Post
I would say the new style ring and pinion have improved in the torsional durability for sure. Not convinced on 44%.
Sorry this is an estimate according to Carl Jantz. When I posted I thought this figure was based on actual rated figures from dana however I think it would still be quite accurate. Carl Jantz is no beginner to drivelines.
"Dana rates the 44 @ 3460 Ft-lbs maximum momentary output torque.
Although I could not get exact figures from Dana the pictures show that the JK44 gears are beefier than a D50 set and since Dana rates the 50 @ 5000 Ft-lbs maximum momentary output torque.
Your going to get more than 1500 ft-lb increase in capacity."

Last edited by mika; 28-11-2013 at 08:38 PM.
  #19  
Old 28-11-2013
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Semi float aka stock JK setups will always bend at the flanges 1st regardless of 30 or 35 spline shafts - the flanges cop all the side loading when bouncing off road on funny angles hence the twist.
Full float running on outer bearings is obviously best but that is a whoooolllllle other ball game - min ful width setup for starters, 5 on 5.5 stud pattern blah blah blah........
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Old 28-11-2013
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Default Re: jeep jk d44 rear 30 spline vs 35 spline

Spline count is only part of the consideration. My 8 spline axles are nearly 4mm or over 10% larger than 35spline D60's.
Regarding semi float, sorry Stu I'll disagree. I have seen many D44 axle twist in the spline area (just where it comes out of the side gears). Ive seen several break in tge end of the spline area, and ive seen heaps of axles bend in the middle - but ive not seen D44 bent/break at the flange ...yet....

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