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2hel



Member Since: 28 Nov 2022
Location: Essex
Posts: 181
United Kingdom 2003 Defender 90 Td5 CSW Java Black
Ashcroft 1.2 transfer box
Morning all,

I think I'm finally ready to push the button and order the ashcroft 1.2 transfer box for my 90 TD5.. though I am onnthe fence about paying the extra for a 'sleeved' casing? Is it worth the extra for those that have gone with it? Generally I use the defender on the road maybe 3k miles a year, I'm just sick of driving at 60mph on the motorways so hoping the 1.2 let's me sit at 70mph easier.

Thanks all
Post #1066580 29th Apr 2025 8:54am
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8243
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
If the engine has the grunt and ratios for rpm work then it will be a good upgrade.

After having the middle shaft bushing fail on a 73k puma I go for sleeved now. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1066584 29th Apr 2025 9:14am
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2hel



Member Since: 28 Nov 2022
Location: Essex
Posts: 181
United Kingdom 2003 Defender 90 Td5 CSW Java Black
It's got a stage 1 Alive tuning remap so hopefully the low end will be OK with the 1.2
Post #1066587 29th Apr 2025 9:35am
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rustandoil



Member Since: 08 Sep 2012
Location: Cotswolds
Posts: 819
England 2005 Defender 110 Td5 XS DCPU Bonatti Grey
I went for the sleeved option....and while I was ordering, ticked every other option too!! Rolling with laughter
Post #1066597 29th Apr 2025 12:19pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8243
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
2hel wrote:
It's got a stage 1 Alive tuning remap so hopefully the low end will be OK with the 1.2


Depends on lots more, run it though ashcroft calculator and see if revs are in right range, if so good to go. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1066609 29th Apr 2025 1:46pm
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2hel



Member Since: 28 Nov 2022
Location: Essex
Posts: 181
United Kingdom 2003 Defender 90 Td5 CSW Java Black
Oh don't say that I've gone and placed the order Laughing

I'll have a double check thanks mate
Post #1066623 29th Apr 2025 6:31pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8243
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Unless you have oversized tyres, run heavy, tow alot.on hilly areas and have roof rack loaded up and are on std diffs I am sure it will work fine. Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1066625 29th Apr 2025 6:39pm
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2hel



Member Since: 28 Nov 2022
Location: Essex
Posts: 181
United Kingdom 2003 Defender 90 Td5 CSW Java Black
I do have oversized tyres 265/65/18

Ran the calculator on their site and seems it should be a noticeable difference with motorway speeds which is the goal Thumbs Up
Post #1066630 29th Apr 2025 8:26pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8243
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
200rpm per 10mph? Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1066639 29th Apr 2025 9:13pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8243
 2011 Defender 110 Puma 2.4 USW Stornoway Grey
200rpm per change for 1.4 to 1.2? Cheers

James
110 2010 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #1066640 29th Apr 2025 9:13pm
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TexasRover



Member Since: 24 Nov 2022
Location: Paris
Posts: 1247
France 2002 Defender 110 Td5 DCPU Chawton White
2hel wrote:
I do have oversized tyres 265/65/18

Ran the calculator on their site and seems it should be a noticeable difference with motorway speeds which is the goal Thumbs Up


The R380/Td5 runs fairly high revs in stock at motorway speeds and comfortable can take another gear. I have a roamerdrive installed and mostly drive in '6th gear' above 55-60 mph no problem.

The problem with the 1.2 box I expect is in the lower gears where you start loosing overlap and find yourself searching for the right gear at certain speeds (3rd-4th). I am sure you get used to it.

When I got my Series it has two RR diffs (3.54) and it was awful to drive. I swapped it back to standard 4.7 diffs, much happier. You don't go far or fast in a Series so it does not matter that much.

Good luck, it will be fine.
Post #1066643 29th Apr 2025 9:26pm
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barbel jim



Member Since: 12 Dec 2012
Location: Northants
Posts: 1443
United Kingdom 2005 Defender 90 Td5 HT Tonga Green
It’ll be absolutely fine, you’ll love it, and yes the sleeved option is worth it, especially if it’s a keeper. I’m awaiting the arrival of my new transfer box from Dave
Post #1066655 29th Apr 2025 10:08pm
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