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Fine and coarse spline axles


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#26 rodomo

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Posted 03 June 2010 - 12:41 AM

Sure is an old thread ya found!

Some standard ones may be cold formed (particularly the V-type splines found on fine spline Torana diffs as opposed to the squaretooth splines found on coarse spline Torana diffs), I've only ever seen them machined but I haven't worked in a factory that mass-produces them.

One of the problems with the typical production car splined arrangement is that the outer diameter of the splined area is the same as the shaft diameter. This means that you get effectively a smaller diameter axle under where the splines are situated. So you're using excessive material for the same torsional rigidity if that makes sense. Basically you end up with a spline diameter that is undersized and a shaft diameter that is nominally oversized (or both undersized in the case of a Torana LOL) and isn't giving you any strength anyway because that isn't the weakest point

The best way to do a splined shaft is to have a larger diameter at either end of the shaft, with a radius leading into that diameter so that there are no stress concentrations (another problem with the typical production car spline arrangement). If the smaller diameter matches the depth of the splines, then you just machine the splines into that larger diameter, back and forth with an indexing head of some description, until you reach the nominal shaft diameter. This also means that the axle is allowed to 'wind up' a little bit so that the peak destructive forces are spread out over a matter of a very small timeframe which seems to make a difference, and when you have a shaft of this design it ends up being lighter too, which in a diff is bloody important if you actually want to go around corners and get the car to handle as well as possible.


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#27 76lxhatch

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Posted 03 June 2010 - 06:59 AM

One of the problems with the typical production car splined arrangement is that the outer diameter of the splined area is the same as the shaft diameter.

Take a good close look - you'll usually find that the splined part actually grows a little in outside diameter compared to the machined area prepared for it

#28 Heath

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Posted 03 June 2010 - 11:15 AM

Not with a (coarse) squaretooth spline Torana axle.

With V-like splines, some to appear to grow a little bit (i.e. have the peaks of the teeth above the nominal diameter) and I'm assuming that's because the splines are formed in and that's where the metal kinda grows out to in the forming process. Fair assumption?

#29 76lxhatch

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Posted 03 June 2010 - 11:48 AM

Correct only with fine splines

#30 Heath

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Posted 03 June 2010 - 01:29 PM

Nice axle: full floater obviously but you get the idea
Posted Image

#31 76lxhatch

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Posted 03 June 2010 - 02:52 PM

What idea are we talking about now? That axle looks like it had different diameter ends on it before they did the spline...?

#32 tsn007

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Posted 05 October 2010 - 03:28 PM

Is there a breakdown somewhere that shows which cars had fine spline and lsd

for example
LH sl,slr slr5000
LX sl,slr ,slr5000,ss

#33 _Spark Eater_

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Posted 03 April 2011 - 06:31 PM

how much stronger is a fine spline LDS banjo compared to a normal banjo? it seems to be the second crappiest on the list, can it handle a red 308 with possibly a mild cam and intake/exhaust/quaddie etc? not talking excessive burnouts, but being able to handle repeatedly stomping the gas with decent 245 tyres..

what should it cost to recondition a fine spline LSD? I can buy one for 250 that's worn down into a single spinner, but apparently the shafts are hardened, I'll get it if it's gonna be tough enough and not absurdly expensive to fix

#34 hanra

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Posted 29 July 2011 - 08:41 PM

This guy is saying this is a Torana Banjo axle with 31 splines??? Wouldnt that make it a 9" axle?

http://cgi.ebay.com....=STRK:MEBIDX:IT

#35 dattoman

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Posted 29 July 2011 - 09:22 PM

Clueless
No such thing

#36 hanra

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Posted 30 July 2011 - 11:05 PM

Do UC Fine splines fit LH Torana housings? Also are the UC ones 23 spline?

http://cgi.ebay.com....e=STRK:MEWAX:IT

#37 EunUCh

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Posted 31 July 2011 - 10:10 AM

UC,23sline,fit straight in,small early salisbury commo fit too but metric PCD

#38 hanra

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Posted 31 July 2011 - 10:42 AM

Good one. Thanks for your help.

#39 hanra

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Posted 05 August 2011 - 08:00 AM

This guy is saying this is a Torana Banjo axle with 31 splines??? Wouldnt that make it a 9" axle?

http://cgi.ebay.com....=STRK:MEBIDX:IT



He now has 28 spline Torana axles for sale?

http://www.ebay.com.au/itm/TORANA-LH-LX-ORIGINAL-28-FINE-SPLINE-AXLES-V8-/330597199930?pt=AU_Car_Parts_Accessories&hash=item4cf920f03a

#40 hanra

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Posted 25 October 2023 - 09:12 PM

LH / LX Torana fine spline axle = 23 spline???

Is that statement correct?

#41 yel327

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Posted 26 October 2023 - 05:57 AM

LH / LX Torana fine spline axle = 23 spline???

Is that statement correct?

 

Pretty sure all of the later banjo and disguised banjo (little salisbury including Gemini) were 23 spline. The early ones were 10 spline. With gradual change-over mid 70's where the final XU1's and V8 Torana went to 23 spline first. 






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