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julian



Member Since: 17 Feb 2017
Location: Devon
Posts: 153
United Kingdom 1994 Defender 110 300 Tdi CSW Alpine White
Updating a pair of older 110 axles to 300tdi era?
What I have -

Salisbury drum rear
Disco 300 rear

20L front
Disco 300 front

What I want -

Two axels the same spec as my factory 110 300 station wagon (vented discs)

Id like to normalize the builds rather than "adapt". I'm not bothered by what is stamped on the casing, but I'd like the internals to be the same parts as the factory station wagon.



My understanding of the rear is simple enough - casing and diff are the same, everything else needs to change. The hub from the 300 disco could be used, but nothing else.


The front I'm way more confused by. I suspect, as it's disc already, most people just use them as is, but if i were (am) wanting to normalize the parts between the builds, can someone give me a brief overview?

Obviously all the part numbers are on the jaguar landrover site and I could get my spreadsheet out and get to the bottom of it eventually by myself, but my suspicion is that someone here will just "know" and be able to furnish me with the answer with ease (both their ease, and mine!)

Thank you!
Post #1065698 17th Apr 2025 9:18am
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Chicken Drumstick



Member Since: 17 Aug 2020
Location: Near MK
Posts: 872
United Kingdom 
Bit confused on what you are trying to achieve. Disco rear axle is weaker than a Salisbury, it would be a down grade.

If the axles aren't broke, why bother messing with them?
Post #1065700 17th Apr 2025 9:53am
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julian



Member Since: 17 Feb 2017
Location: Devon
Posts: 153
United Kingdom 1994 Defender 110 300 Tdi CSW Alpine White
I want to build two 300tdi spec 110 axles from what I have.

I have two axels under my 300tdi 110. I want another pair built from the same parts.

Again, I'm aware that, to achieve this on the rear, I can keep the casing and diff, and the rest needs to be replaced (I could use the hubs from the disco axel, but none of the other parts are the same)


But I do not know about the front one. Obviously as-is, the shafts, CV joints etc are all different, but I'm unsure if the disco ones can be used. I'm unsure if the diff needs to be changed. Etc.

So, I know what to do with the rear. Maybe forget I mentioned that. It's the front that I'm unsure about.
Post #1065702 17th Apr 2025 10:58am
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I Like Old Skool



Member Since: 23 Feb 2015
Location: Manchester
Posts: 842
United Kingdom 1994 Defender 110 300 Tdi ST Coniston Green
I think you are wasting your time. Drum braked Salisbury is 10 spline. 300 TDI axle is 24 spline. The hubs and shafts are not compatible.
Post #1065746 17th Apr 2025 10:29pm
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julian



Member Since: 17 Feb 2017
Location: Devon
Posts: 153
United Kingdom 1994 Defender 110 300 Tdi CSW Alpine White
In my initial post, I said -

Quote:
My understanding of the rear is simple enough - casing and diff are the same, everything else needs to change. The hub from the 300 disco could be used, but nothing else.


Which is exactly what you have re-itterated, 4 posts in.

In the post prior to yours, I clarified -

Quote:
So, I know what to do with the rear. Maybe forget I mentioned that. It's the front that I'm unsure about.


I mention this not to upset you, but to try and direct subsequent replies away from further comments on the rear axel.

Thank you.
Post #1065747 17th Apr 2025 10:41pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2729
Scotland 
The Disco 300 front axle is basically the same as the 110 300 front axle. Just put a new set of Defender brakes on it.
Post #1065757 18th Apr 2025 8:07am
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Linds Hanson



Member Since: 16 Jan 2021
Location: Cornwall
Posts: 511
United Kingdom 
To be honest the rear Salisbury axle is more complicated as there are different discs, calipers and pads dependent on age. Both can be interchanged providing you fit all the above matching parts together. You will obviously also require the caliper mounting brackets to adapt the drum to discs. The Discovery rear shafts work fine.
Post #1065764 18th Apr 2025 11:17am
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I Like Old Skool



Member Since: 23 Feb 2015
Location: Manchester
Posts: 842
United Kingdom 1994 Defender 110 300 Tdi ST Coniston Green
300tdi discovery shafts (single piece 24 spline) will not fit in a 10 spline Salisbury axle....
Post #1065770 18th Apr 2025 1:01pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2729
Scotland 
You don’t need to, as the earlier Salisbury is already 24 spline. The only difference in early/late shafts is the later ones have the seal land. There is no 10-spline Salisbury for 90/110.

Yes Rover axle (Disco/90 & 110 front) shafts are different.
Post #1065774 18th Apr 2025 2:24pm
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Linds Hanson



Member Since: 16 Jan 2021
Location: Cornwall
Posts: 511
United Kingdom 
I Like Old Skool wrote:
300tdi discovery shafts (single piece 24 spline) will not fit in a 10 spline Salisbury axle....
So where have you ever seen a 10 spline Salisbury axle?
Post #1065777 18th Apr 2025 3:40pm
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I Like Old Skool



Member Since: 23 Feb 2015
Location: Manchester
Posts: 842
United Kingdom 1994 Defender 110 300 Tdi ST Coniston Green
Apologies, I have always been under the impression that the pre-disc brake defender axles were all 10spline.

Just out of interest, what spline count is the series 3 Salisbury axle?
Post #1065791 18th Apr 2025 6:11pm
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MarkBrown



Member Since: 03 Oct 2022
Location: Mid Wales
Posts: 534
Wales 1983 Defender 110 Other HT Auto Keswick Green
I'm pretty sure that the Salisbury axle in a series 3 has 24 splines, but must be shorter. I've swapped out the 3.54 110 Salisbury diffs for the series 4.7's in the past.

As said the early 110 front diffs are 10 spline at the diff and 23 spline at the CV's. These can be swapped out for a 24 spline diff along with 24/23 spline halfshafts from Ashcroft - but still won't accept vented discs. 1983 110 automatic OM606
Post #1065812 18th Apr 2025 9:35pm
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julian



Member Since: 17 Feb 2017
Location: Devon
Posts: 153
United Kingdom 1994 Defender 110 300 Tdi CSW Alpine White
Quote:
As said the early 110 front diffs are 10 spline at the diff and 23 spline at the CV's. These can be swapped out for a 24 spline diff along with 24/23 spline halfshafts from Ashcroft - but still won't accept vented discs.


Would it be possible to get all the internals out of my 300 disco front and transplant them to the 20L casing?

I know that if the defender rear drums are replaced with discs, the disco stuff can't be directly transplanted without spacers and other adaptations, which I don't want to get into.

I guess the question is, if the length is identical on the earlier front axels from diff to flange. And will the disco diff go in without prop issues.


I'm aware that, as r.anaconda said, you can transplant in the axel complete, but, for authenticity, I would rather keep the original casing if I can.

Thank you.
Post #1065814 18th Apr 2025 9:58pm
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MarkBrown



Member Since: 03 Oct 2022
Location: Mid Wales
Posts: 534
Wales 1983 Defender 110 Other HT Auto Keswick Green
My early 110 has a 20l front casing and it's interchangeable with a disco tdi casing, except the later has the brackets for anti roll bars. I only know this because I considered a casing swap on mine to gain the anti roll bars brackets for possible future use, but decided it wasn't such a good idea as my 20l was in better condition and already refurbished/ fitted and I think something was bent on the donor, so I scrapped it.

Swapping out the rear Salisbury axle would be possible I'd presume but would require a different prop shaft ( longer ) and would be considered a downgrade as it's not as strong. I don't know if the disco tdi hubs would fit the Salisbury casing - I'd say not as the disc brake conversion to the Salisbury axle requires the use of the front hubs from the 20l casing and when researching my rear disc conversion I only found two ways, both didn't use the disco hubs.

Visually the drive flanges are different on the 300 era axle - they're thinner. 1983 110 automatic OM606
Post #1065830 19th Apr 2025 7:59am
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Bowbearer



Member Since: 12 Aug 2022
Location: Norfolk
Posts: 210
United Kingdom 1985 Defender 110 200 Tdi SW Auto Baltic Blue
Salisbury fronts can be 10 spline.
Post #1065867 19th Apr 2025 2:28pm
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