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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
It's an Ashcroft HD P38 with ATB centre.
Quote from Mr Ashcroft

I will give a quick overview,

its pretty well recognised that dropping the Salisbury and going to the P38 type diff was a fairly major step back on terms of strength, the main problem is not the shafts or the diff centre but the ring and pinion, in my view this is because the pinion bearings are too close together which increases the load on the bearings which causes either the bearings to fail or the ring and pinion to get noisy,

early designs looked at making a new diff centre but this was a much bigger job and once I decided the centre was OK I decided to just design the new ring and pinion around the stock rover type diff, because of this we can supply this diff with any centre that fits the rover diff (not the P38 one) so you can fit, our air locker, our ATB, quaife, whatever, the only mod required is to drill out the 10 crown wheel holes as we thought it would be good to use larger bolts in the crown wheel seeing as we were making it from scratch and these bolts can be a problem,

to get a significant strength increase in the ring and pinion meant 2 things :

1) space the pinion bearings further apart, like the rover diff with the longer 'nose', this moves the drive flange forward which means the rear prop needs to be shortened by 31mm,

2) make the new ring and pinion a hypoid design, ie by lowering the pinion you get far more contact area on the meshing teeth which reduces the load on them, this also makes the pinion much bigger in diameter :
👍

Last edited by John Fair on 3rd Dec 2016 7:17am. Edited 1 time in total
Post #582297 2nd Dec 2016 9:57pm
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JOW240725



Member Since: 04 May 2015
Location: Suffolk
Posts: 7904
United Kingdom 2012 Defender 110 Puma 2.2 XS CSW Orkney Grey
Is the OEM diff that bad under normal duties? Sounds like I'll need to come and visit you if and when I need new diff! I really don't understand them! I would like a limited slip in the rear at some point. James
MY2012 110 2.2TDCi XS SW Orkney Grey - http://www.defender2.net/forum/topic43410.html
MY1990 110 200TDi SW beautifully faded Portofino Red - https://www.defender2.net/forum/post743641.html#743641
MY1984 90 V8 Slate Grey - https://www.defender2.net/forum/post744557.html#744557
Instagram @suffolk_rovers
Post #582300 2nd Dec 2016 10:19pm
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
James, just to clarify, the diff is the work of Dave Ashcroft. In answer to the question,are they really that bad, it's a Landrover. No really, mine started pinging at 5k from new whilst driving various passes in Europe. These are road passes not tracks but still work the car with the amount of hairpins etc. It may have lasted forever but I suspect not. L,R wouldn't change it under warranty because the vehicle is modified. Amongst the various things they didn't like were my glovebox mod, wheel spacers ( it has none but the highly trained tech seemed to think it had??), big wheels, again the highly trained techs couldn't get it in their heads that an 18" wheel with a lower profile tyre gives the same rolling diameter ( probably the same person that thought it had wheel spacers)and it "might' be chipped. It wasnt and I might be winning the lottery next week if we're going to live our life's on what might be. Anyway I couldn't really see the point in getting over involved in an argument with them as you can never win an argument with a stupid person and I intended to replace it with a non standard diff at some point to resolve the various weaknesses. Lord knows the next time it's in the poor chaps head is going to explode when he see's my brakes and shortened prop. 😱😱😱
How long will yours last? Who knows. I'm sure there are lots out there that have done big miles but I have also been told from more than one source that LRE are eating rear diffs at an embarrassing rate quoting 10 weeks or every 1000 miles I appreciate you could say this is accelerated wear but it shouldn't be happening at that sort of rate and they shouldn't have given me a hard time about my own diff as though they had never seen or heard of such a thing.
Post #582331 3rd Dec 2016 7:07am
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
Quick few jobs today. Along with some security updates I also moved the trailer electrics into the crossmember as it's going in for some warranty paintwork along with a crossmember paint job. Before you ask no it's not rusty it's just oozing dinitrol.

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Post #582407 3rd Dec 2016 2:40pm
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JOW240725



Member Since: 04 May 2015
Location: Suffolk
Posts: 7904
United Kingdom 2012 Defender 110 Puma 2.2 XS CSW Orkney Grey
Thanks John, was reading on my mobile and obviously not properly!

So is this a standard available diff from Ashcroft? How is it? Do you feel a different driving it on the road? Is it the one I should put on my list for if/when my diff goes?

I'm always surprised with the inconsistency of dealers with warranty work and modifications. I think it was Likeomg on here (I might be wrong) that has pretty much every performance improvement, remap, vvt, 18" wheel and still got a gearbox changed under warranty. Makes no sense. James
MY2012 110 2.2TDCi XS SW Orkney Grey - http://www.defender2.net/forum/topic43410.html
MY1990 110 200TDi SW beautifully faded Portofino Red - https://www.defender2.net/forum/post743641.html#743641
MY1984 90 V8 Slate Grey - https://www.defender2.net/forum/post744557.html#744557
Instagram @suffolk_rovers
Post #582530 3rd Dec 2016 9:37pm
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
Morning James
I'm not sure about availability as I believe they never really came to market. You might have to butter him up to make you one but yes it is the way forward. Ref the dealer I think your correct. Completely inconsistent and unfortunately the local dealer is pants (though oddly the parts department is the best ever). I would have taken it elsewhere but I was going to change it out anyway. They also ripped my rubber matting and said no it was already like that as the tech put it in his report. I can assure you it wasn't as I have an eye for detail. It's all being absorbed ready for the big slap in the face. 👍

Last edited by John Fair on 10th Dec 2016 11:58am. Edited 1 time in total
Post #582599 4th Dec 2016 9:52am
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black

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Post #583819 10th Dec 2016 9:03am
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JOW240725



Member Since: 04 May 2015
Location: Suffolk
Posts: 7904
United Kingdom 2012 Defender 110 Puma 2.2 XS CSW Orkney Grey
Ooo shiny. Thumbs Up

As for the diff, sounds expensive if a special build? Embarassed James
MY2012 110 2.2TDCi XS SW Orkney Grey - http://www.defender2.net/forum/topic43410.html
MY1990 110 200TDi SW beautifully faded Portofino Red - https://www.defender2.net/forum/post743641.html#743641
MY1984 90 V8 Slate Grey - https://www.defender2.net/forum/post744557.html#744557
Instagram @suffolk_rovers
Post #583825 10th Dec 2016 9:37am
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
Pm sent.
Post #583846 10th Dec 2016 11:42am
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
Quite impressed with the quality of finish. The Matt Gloss Colour thing went round and round but I'm happy with the end result.

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Post #583848 10th Dec 2016 11:49am
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L110CDL



Member Since: 31 Oct 2015
Location: Devon
Posts: 10742
England 
Very nice John, looks a good job Thumbs Up 1996 Golf Blue 300Tdi 110 Pick up.

Keeper.

Clayton.
Post #583952 10th Dec 2016 8:59pm
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
Thanks Clayton, really quite pleased with it. At one point it was even going to be santorini black metallic. Glad it's just plain gloss black now it's done. Even gave it a clean today. 👍🎄
Post #584275 11th Dec 2016 9:26pm
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L110CDL



Member Since: 31 Oct 2015
Location: Devon
Posts: 10742
England 
Agree with you there Thumbs Up Not had a chance to clean mine yet, starting to get withdrawal symptoms its been so long with out a good clean Rolling with laughter 1996 Golf Blue 300Tdi 110 Pick up.

Keeper.

Clayton.
Post #584285 11th Dec 2016 9:43pm
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John Fair



Member Since: 10 May 2016
Location: Norfolk
Posts: 150
United Kingdom 2013 Defender 110 Puma 2.2 USW Santorini Black
Rear seat heating major upgrade for euro road trip. 👌

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Post #585784 17th Dec 2016 1:48pm
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Rosco



Member Since: 03 Dec 2010
Location: Burntwood
Posts: 1833
United Kingdom 2015 Defender 110 Puma 2.2 XS CSW Montalcino Red
Sounds interesting John. Any more detail? 2007 - Stornoway Grey 90 XS SW - Gone
2002 - Black Discovery II - Gone
2014 - Montalcino Red 110 XS SW
Post #585815 17th Dec 2016 4:58pm
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