36 spline versus 48 spline steering wheels - Defender Source
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  #1  
Old August 16th, 2013, 10:32 AM
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36 spline versus 48 spline steering wheels

I have spent some time researching this but cannot find the answer I am looking for.

I have a Defender column from an unknown year truck. My Series 3 steering wheel does not fit. The female spline on the wheel is too large.

This is the simple question I need answered,

I see the 48 spline column referred to as the "fat" shaft. But, are the actual splines a smaller diameter than the 36 spline? And the column fattens up after the splines?

Also, is there any difference at the steering shaft end between the two columns?

I need to buy a steering wheel and I dont want to do this twice...
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  #2  
Old August 16th, 2013, 10:49 AM
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I'm not sure I understand the problem. there are two shaft splines, 36 and 48. 36 is smaller than 48..... You need a 36 spline wheel (or boss) for a 36 spline shaft. LR went back and forth from the two splines a few times.
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  #3  
Old August 16th, 2013, 10:56 AM
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Right but as far as I understand, my Series 3 wheel should be 36. If that is true, then I must have a 48 spline column which is actually a smaller diameter spline despite the higher spline count.
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  #4  
Old August 16th, 2013, 11:35 AM
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No, Series wheels are 48 spline. You can count them....
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  #5  
Old August 16th, 2013, 11:41 AM
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Of course I could count them except my shop is an hours drive away and I only have time to get there once per week.

Are you sure all Series wheels are 48? I thought early II/IIA are 48 and then Series III (like mine) is 36.
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  #6  
Old August 16th, 2013, 12:18 PM
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Everything I read is the later series trucks are 48 spline and match the 300TDI era Defenders.
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Old August 16th, 2013, 12:18 PM
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That web rover link is good but I'd rather see photos of the column ends next to each other actually showing the splines instead of just ambiguous wheel photos. The large versus small smaft nomenclature is confusing if the spline diameters are actually opposite of that.
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  #8  
Old August 16th, 2013, 12:20 PM
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Series wheels are 3/4-48, except for early banjo. Later Defender wheels are 3/4-36 or 1-48 spline. These are pretty much standard sizes.
The shafting components and power steering inputs are all 3/4-48 for all years and models (that may have changed with the latest batch of LR3/4, RR, Evoque, etc. which are probably metric, but I don't know)
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  #9  
Old August 16th, 2013, 12:29 PM
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Quote:
Originally Posted by o2batsea View Post
Later Defender wheels are 3/4-36 or 1-48 spline. These are pretty much standard sizes.
I'm pretty sure the 48 spline Defender wheels are 3/4", same as later Series. The 36 spline is non standard.

https://www.merlinmotorsport.co.uk/s...its/land-rover
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  #10  
Old August 16th, 2013, 12:34 PM
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Glad im not the only one confused here...!
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  #11  
Old August 16th, 2013, 12:41 PM
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Yes. But the Defender column I have does not fit the series 3 spoke.
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  #12  
Old August 16th, 2013, 12:45 PM
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I'm not sure. This transpired just as I was leaving the shop yesterday and I figured I could find an answer quickly on the web (should have known better). I did not count the splines but I can tell you the spline diameter of the column is significantly smaller than the spline in the 3 spoke series wheel.
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  #13  
Old October 11th, 2013, 10:54 AM
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Yes I was able to make the hour plus trek to the shop finally. Fabricated a steering box bracket and counted the splines on the column - 36.

The 3-spoke Series wheel must be 48 (I didnt count that because it doesnt really matter).

So I am now on the hunt for an old-school 4 spoke 36 spline wheel.
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  #14  
Old October 14th, 2013, 07:28 AM
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The three spoke SIII wheel fits the NAS spec column. Unless someone is slipping me weird columns.

------ Follow up post added October 14th, 2013 07:32 AM ------

Quote:
Originally Posted by o2batsea View Post
The shafting components and power steering inputs are all 3/4-48 for all years and models (that may have changed with the latest batch of LR3/4, RR, Evoque, etc. which are probably metric, but I don't know)
....or P38? DII? pretty sure they are different unless I am missing something in my mix and match world.
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  #15  
Old October 15th, 2013, 11:16 AM
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I just went through this on the hybrid I'm building. I had a defender column from a unknown truck. The lower spline was the standard 3/4"-48 but the upper measured 11/16"-36. I used a old school 3 bolt hub from a junkyard chevy to mount a flat wheel.
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  #16  
Old October 15th, 2013, 11:31 AM
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Matt,

What thread pitch/diameter is the nut that threads onto your steering wheel shaft?
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  #17  
Old October 15th, 2013, 11:56 AM
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Quote:
Originally Posted by sonoronos View Post
Matt,

What thread pitch/diameter is the nut that threads onto your steering wheel shaft?
I just measured it and it looks like 9/16"-18
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  #18  
Old October 15th, 2013, 06:30 PM
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Thanks!
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  #19  
Old October 16th, 2013, 05:49 AM
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Great. Now I dont know what the heck I did as I honestly was pretty excited when the Series III wheels dropped right on the last two Defender columns I used. Thought they where NAS columns.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

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  #20  
Old October 16th, 2013, 02:08 PM
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Matt, when I did the PS conversion on my IIA ten years ago I was able to drop a 3 spoke SIII wheel right on using an unknown Defender column as well. Thats why I was surprised when it didnt this time around. This time, I have the same column that the other Matt does.

Be careful. Friends don't let friends drive with vice grips on the steering shaft nub.
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