changing 10 spline axles to 24 spline ones. series 2a

**andy3542** · 25th March 2011, 06:39 AM

hey
as the title says iv currently got 10 spline axles in my land rover front and rear. i need to change them to 24 spline so i can look at getting a chinese air locker. i know arb do lockers for 10 spline 4.1 ratio gears but i dont really have 2.5k to get one fitted. id like an air locker so i can turn it on/off dont really want it locking up on wet roads round a corner....

Someone suggested getting the spider gears of a disco but on further investigation that doesnt appear to be possible?

Can you run with 10 spline in the front and 24 in the rear?

Does/has anyone know anyway to do this without modifying disco running gear to fit underneath?

Cheers

**isuzurover** · 25th March 2011, 07:26 AM

There are no "off the shelf" parts to convert a series to 24 spline.

Even the stage 1 V8 was 10-spline at the diffs. If you wish to fit 24 spline lockers you will need to buy aftermarket 24-spline axles. They are available for as little as AU$500/pr and are much stronger than OEM 24-spline.

Swapping side gears won't help as they are part of the diff, which is completely replaced by the locker. No problem with 24 front and 10 rear. Have a look at the ashcroft air locker.

**andy3542** · 25th March 2011, 08:28 AM

Originally Posted by isuzurover

There are no "off the shelf" parts to convert a series to 24 spline.

Even the stage 1 V8 was 10-spline at the diffs. If you wish to fit 24 spline lockers you will need to buy aftermarket 24-spline axles. They are available for as little as AU$500/pr and are much stronger than OEM 24-spline.

Swapping side gears won't help as they are part of the diff, which is completely replaced by the locker. No problem with 24 front and 10 rear. Have a look at the ashcroft air locker.

so if i get aftermarket 24 spline axels will the fit straight in with the air locker into the series rover axel+diff housing?

cheers

**isuzurover** · 25th March 2011, 08:33 AM

Originally Posted by andy3542

so if i get aftermarket 24 spline axels will the fit straight in with the air locker into the series rover axel+diff housing?

cheers

Yes if you buy the right ones.

**andy3542** · 25th March 2011, 10:56 AM

Originally Posted by isuzurover

Yes if you buy the right ones.

just another (stupid?) question... can you take 10 spine axels out and slide the 24 spline ones in assuming they are the correct diameter? or are the diff head specially 10/24 spline?

**Timj** · 25th March 2011, 02:46 PM

There is a spline on a 2A on both ends of the axle since it is a fully floating axle. One spline inserts into a drive gear in the axle and the other end into a drive gear in the hub. So you need to change the diff (chinese locker should do that), you need to change the axles (Hytough or others do this) and you need to change the drive hub at the wheel (Also Hytough or others for aftermarket or late series 3 LWB I think for standard). All up you might end up spending just as much, but then stronger axles and hubs are probably going to be a requirement anyway if you really need the locker. But how strong is the locker?

TimJ.

**Lotz-A-Landies** · 29th March 2011, 06:09 PM

Sorry I'm a little confused here.

Is the Chinese Air Locker based on a replacement 24 spline hemisphere for Rover type 3.54:1 diffs (i.e. Defender, Discovery and late RRc)?
Or
Are they a 24 spline replacement for the Series LR 4.7:1 diff hemisphere?

The two hemispheres are different owing to the relative position of the 3.54 and 4.7 crownwheels.

If it is the second option, then getting Barry (HiTough) to broach a couple of series halfshafts with 24 splines at the diff end won't be a problem.

If the Chinese are selling Air Lockers for Defender;RRc; and Disco 1 & 2 then the 10 Vs 24 spline is an entirely different issue and does not lend itself to an easy solution in a Series Land Rover. Sorry

**isuzurover** · 29th March 2011, 08:44 PM

Originally Posted by Lotz-A-Landies

Sorry I'm a little confused here.

Is the Chinese Air Locker based on a replacement 24 spline hemisphere for Rover type 3.54:1 diffs (i.e. Defender, Discovery and late RRc)?
Or
Are they a 24 spline replacement for the Series LR 4.7:1 diff hemisphere?

The two hemispheres are different owing to the relative position of the 3.54 and 4.7 crownwheels.

If it is the second option, then getting Barry (HiTough) to broach a couple of series halfshafts with 24 splines at the diff end won't be a problem.

If the Chinese are selling Air Lockers for Defender;RRc; and Disco 1 & 2 then the 10 Vs 24 spline is an entirely different issue and does not lend itself to an easy solution in a Series Land Rover. Sorry

Diana, the coiller/3.54 diff centres can be used in 4.7 applications, you just need to use a spacer under the crownwheel. In fact maxi-drive lockers were only made in the 3.54 type.

Btw - it is not possible to "broach a couple of series halfshafts with 24 splines at the diff end"... If you are talking 2nd hand axles - 10 spline can't be increased. And if you are talking new axles, external splines are not usually cut using a broach.

EDIT:
Ashcroft Transmissions - 4.7 Spacer ring

**Lotz-A-Landies** · 30th March 2011, 12:08 AM

Thanks Ben

I knew there was a problem one way, but thought it was the other way around.

On the broaching splines, I was talking about blanks before hardening, not re-cutting splines in old halfshafts. Maxi-Drive halfshafts for series LR were always 24 spline at the drive flange end and I assume also the Hy-Tough ones are the same.

Secondly when Mal was making up my specials for the SIIB ENV diffs, I had to send him a side gear from the hemisphere so he could have the ENV broach made. If he needed a broach for the ENV then I would assume Maxi-Drive used a broach for all their halfshaft splines.

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