Member Since: 08 May 2017
Location: Irvine
Posts: 24
ARB Rear Diff Lockers on D3
Looking in to adding a diff locker to my D3. Anyone done this and did it make a difference or is the Terrain Response sufficient for undulating/frame twister loose steep climbs?
Looking forward to your thoughts.
6th Jul 2017 1:01 am
bimblephish
Member Since: 21 Jul 2016
Location: Wiltshire
Posts: 272
From what I have read elsewhere on the internet it is very involved to add a locking rear diff and from my own experience terrain response is terrific (managed to drag me up a muddy slope first time after a defender had taken two or three goes)
6th Jul 2017 12:01 pm
L319
Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2080
A chap in The Discovery Owners Club ( http://lrdoc.lpl-uk.com/ ) retrofitted an Electronic diff from a scrap LR3 and did a write up in their magazine . It was quite involved but all worked properly.
6th Jul 2017 12:33 pm
NitrOx
Member Since: 08 May 2017
Location: Irvine
Posts: 24
ARB air lockers
Looking to do aftermarket air locker not the factory e-locker. Wondering if anyone has experience with that and if it improved offroad performance
6th Jul 2017 2:38 pm
NitrOx
Member Since: 08 May 2017
Location: Irvine
Posts: 24
ARB Rear Locker Indstalled
So given that I didn't get much feedback on this topic, I went ahead and bit the bullet.
Installed the ARB pneumatic rear differential locker and tested it on steep, loose and uneven terrain. You definitely notice a difference in the vehicle's ability to climb uneven terrain with lockers engaged.
With Terrain Response only, climbing is a bit notchy where the wheels need to spin a bit before TR kicks in. So it becomes a cycle of loosing traction then regain it.
In contrast, with rear differential locked, climbing becomes much smoother with hardly any noticeable wheel spin. It almost is like cheating. Makes the vehicle more like a point and steer as long as you are smooth on the throttle.
Overall, I really like the performance of locker rear differential and is well worth the investment if you do technical offroading.
Will it fit a 13MY D4 rear?1972 Range Rover Classic 2 door V8
2013 Land Rover Discovery 4 HSE - SCRAPPED
2016 Land Rover Discovery 4 Landmark
2022 Volvo XC40 T5 PHEV 282HP FWD 3 cylinder!
22nd Aug 2017 6:15 am
garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1117
No there is no model for the rear of D4 but model number RD 217 may fit the front.
Member Since: 23 Dec 2009
Location: in my Mancave.
Posts: 1373
That ARB locker sounds great, glad your sorted. I've fancied one but the cost is beyond me Mantec sump guard.
Prospeed tree slider/steps.
Flack duel battery system.
18"Compomotive/AT3 tyres
Brembo 4pot front brakes
22nd Aug 2017 8:10 am
Panoramix
Member Since: 16 Dec 2008
Location: Milan Area
Posts: 3249
Great mod. 8)
It is also on my next plans
Discovery 3 "Tank", 2.7 TDV6 - Fully Land Rover Passion edition
LR4 "Enterprise", 5.0 V8 Petrol: now factory style but it will be like that for a long time
L322 "Centurion 3.6 TDV8", Land Rover Passion edition in progress
22nd Aug 2017 8:27 am
Speeder2000
Member Since: 26 Dec 2018
Location: Randers
Posts: 3
I know it's an older post, but im looking into airlocks aswell.. What was the total cost of the transformation?
17th May 2019 7:15 pm
NitrOx
Member Since: 08 May 2017
Location: Irvine
Posts: 24
It’s been a while but it cost me around $3k USD; YMMV
17th May 2019 8:16 pm
NitrOx
Member Since: 08 May 2017
Location: Irvine
Posts: 24
Speeder2000 wrote:
I know it's an older post, but im looking into airlocks aswell.. What was the total cost of the transformation?
I’ve since added an ARB front locker too
19th May 2019 6:24 am
PCT3
Member Since: 13 May 2017
Location: Kent
Posts: 144
Nice for straight line driving lol
I don’t know the answer and I can’t see what difference it makes, the Toyota hilux with traction control and rear diff lock from the factory. If you lock the rear diff the traction control switches off? If this is required anyone know why? Personally I would think if the traction control can’t see a spinning wheel it wouldn’t operateDiscovery 3 HSE 07
Discovery 1, Search & Rescue SE4x4 Responce
Fiat Decato motor home
Mazda MX5
19th May 2019 7:15 am
garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1117
As you indicated - in the LR TC stays on and at the wheels does not activate as it sees the wheels turning at the same speed. However remember the TC system also activates on the CDL as well so if rear wheels had traction and the both front wheels did not have traction drive transfers to the rear wheels.
I would not pay any attention to what happens in a Hylux - they are so far behind in technology its not funny. Who switches off the whole traction control system just because you have activated the rear diff lock - nonsense.
19th May 2019 10:04 am
DiscovEric
Member Since: 07 Jan 2017
Location: Buckley
Posts: 84
NitrOx wrote:
Speeder2000 wrote:
I know it's an older post, but im looking into airlocks aswell.. What was the total cost of the transformation?
I’ve since added an ARB front locker too
Appreciate this post is a couple of years old now, but wanted to get your feedback on how the Front and rear air lockers have been for you? Has it been worth your while getting both lockers fitted vs just the rear? Any issues you’ve had over the time you had this set up.
TIA
Ericiid BT, Devon 4x4 sump guard, Compomotive PD1881s with 33” Toyo Open Country MT’s, Prospeed Mk2 Roof Rack, Prospeed Rear Access Ladder
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