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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
Stock TD5 and a 1.2 Transfer Box
Transfer box on my 110 really needs replacing, and I don't really have the budget for a nice shiny new rebuild, so been looking at the second hand market, specifically cheap 1.2 Disco boxes!

There's lots of conflicting opinions out there, how drivable is it?

I already have the higher 5th gear from ashcroft, so one concern is that at 60-65 I'd constantly be jumping from 4th to 5th, especially when towing.

My other concern is pulling away with a trailer on.

Thoughts from those that have done it?
Post #817352 28th Feb 2020 10:55am
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excossack



Member Since: 22 Feb 2012
Location: North West
Posts: 5743

United Kingdom 1999 Defender 110 Td5 SW Caledonian Blue
I had the 1.2 t/box and went back to a 1.4 t/box.
I found around town it was OK, but dragging cars through a forest or on race tracks on the back of the Harvey I was constantly up and down the box. Much better for me with a 1.4 box.
Depends on the usage I guess. 1999 Defender TD5 110

Regards
John M0VAZ
Econet Station 48 no clock
Post #817369 28th Feb 2020 12:25pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

2011 Defender 110 Puma 2.4 USW Stornoway Grey
Borrow a set of 33" tyres and run around on them for a bit. Its approx same ratio change. Would give you a good idea of affect of fitting 1.2 box without the agro. Lots of disco2 boxes dont have diff lock which if your towing could have impact even if not doing any off road. Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #817374 28th Feb 2020 1:24pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
That assumes I have a friend with a spare set of 33" tyres!
Post #817383 28th Feb 2020 3:19pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

2011 Defender 110 Puma 2.4 USW Stornoway Grey
possibly i was just trying to give you options before taking the t box off and replacing it.

thought it might prompt someone in your area to offer.

buy one and try it, what is it 3.5hrs to change it?

stock td5 towing on any hills and i would of thought 1.4 would be better suited.

Ashcrfot 1.3? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #817391 28th Feb 2020 3:57pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
Ashcroft 1.3 does look like a good compromise, just again added cost! If I'm going to go down the line of a refurb, I'd love to get a centre ARB but they aren't cheap!
Post #817393 28th Feb 2020 4:04pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 7687

2011 Defender 110 Puma 2.4 USW Stornoway Grey
i fail to see the point of a centre ATB when a def LT230 has the option to lock. in an axle maybe but in the T box? Cheers

James
110 XS Utility
130 Puma Station wagon/camper (in the making)
90 Puma Hardtop
Post #817401 28th Feb 2020 4:31pm
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gtmotorsport



Member Since: 29 Jun 2016
Location: Cornwall
Posts: 97

United Kingdom 2006 Defender 110 Td5 CSW Zermatt Silver
Can confirm that a standard Td5 110 with 1.2 transfer does make towing harder. You are indeed dropping 5th to 4th to maintain 60mph. Can only imagine the issue being worse with the V8 5th gear. I have however had mine remapped by Td5inside and she’s spot on now, giving the low down torque to keep pulling.
Post #817409 28th Feb 2020 5:17pm
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MadTom



Member Since: 10 Sep 2013
Location: Olomouc
Posts: 576

Czech Republic 1999 Defender 130 Td5 HCPU Baltic Blue
I had 1,2 transfer box on Discovery 2 with 238/85/R16 tyres (32"), and it was hard to start moving on first high gear, without play with clutch. When moving, remapped TD5 had enough power to move our bit heavy (like 3200 kg) travel car. When towing, first move was on low gear, and than switch to high with car still moving.
After change of diff gearing from standard 3,54 to 3,8 it is now much better.
With 130 TD5 and stock 1,4 transfer box, it is nice to drive also with 1,5 ton loaded. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo Smile
Post #817427 28th Feb 2020 7:09pm
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LandymanStefan



Member Since: 30 Aug 2017
Location: Surrey
Posts: 860

England 2001 Defender 90 Td5 SW Epsom Green
I have a 1.2 transfer box on my stock 90 and I don’t tow. It’s great for me and what I do but I wouldn’t want to tow anything heavy with it, it wouldn’t struggle to hold its revs on long motorway uphills I imagine.
Post #817429 28th Feb 2020 7:13pm
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benniferj



Member Since: 20 Oct 2016
Location: Basingstoke
Posts: 361

United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
I always get to this point where I think about giving a 1.2 box a go and never do... because of all of these negatives I read... 1.3 Ashcroft at some point when I've got some spare coins... sounds like the ideal balance.
Post #817431 28th Feb 2020 7:31pm
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benniferj



Member Since: 20 Oct 2016
Location: Basingstoke
Posts: 361

United Kingdom 2003 Defender 110 Td5 XS CSW Oslo Blue
You say you've got a high 5th, now I'd say a TD5 110 as standard on a 1.4 is quite revvy in 5th at 70, it cruises comfortably and economically at nearer 60, so now you've put in a high 5th, what would you say its comfortable speed is?
Post #817432 28th Feb 2020 7:32pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
65-70 is my happy place, It can be pushed to 80 but it does get loud.
Post #817436 28th Feb 2020 8:00pm
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1758

United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
jst wrote:
i fail to see the point of a centre ATB when a def LT230 has the option to lock. in an axle maybe but in the T box?


Some people seem to be big fans of the drivability and driveline backlash improvement mostly.
Post #817437 28th Feb 2020 8:11pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16879

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
It's also more robust than the stock unit, and a new ATB from Ashcroft is a lot cheaper than a new centre diff from LR (which is over£1600 as I recall).
Post #817439 28th Feb 2020 8:20pm
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