 | Home > General & Technical (L663) > Sarek Automotive is working on a lockable rear diff |
 
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2645   
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https://www.facebook.com/X5offroad/posts/p...aNBDrxQoDl
 Click image to enlarge -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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8th Feb 2023 10:01am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2645
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He just posted some more details:
"Almost have the working prototype for a selectable air locker for folks without the factory rear TOD rear locker. Final product will be a Billet case half to replace the factory differential case half and an ARB carrier unit. This will give the ability to manually lock the rear differential independent of the terrain response system settings or in case of failsafe operation. The ARB differential is also much stronger than a stock differential. The ARB has 4 spider gears vs stock with 2 spider gears with a single pin. Billet housing will include a larger carrier bearing and reinforced bearing race support. Case half will have all provisions to connect air line without the need to drill and tap." -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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8th Feb 2023 11:54am |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2841 
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At what level of off-road use does a locking rear differential become necessary?
l never used the locking centre differential on my 2005 Defender in the nine years l owned it, and l didn't even have the ABS/TC The new one in standard specification seems fairly unstoppable in standard specification (no locking rear differential) There must obviously be times when it's an advantage otherwise someone wouldn't be going to the trouble of developing an aftermarket one. |
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5th Mar 2023 10:49am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2645
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^ mate, if you're not locking your CDL, you're not off-roading
The OEM rear diff lock comes into use more often than you think, mostly to aid traction/reduce strain on the drivetrain. It also comes into play on-road, especially in the twisties. Of course, not applicable to this aftermarket one. -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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5th Mar 2023 11:24am |
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| DSC-off Member Since: 16 Oct 2014 Location: North East Posts: 1428 
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^
Excuse the example vehicles, but this type of thing requires difflocks on a high traction surface. Note, no spinning tyres when wheels are lifted in the air or climbing steps. On a low traction surface, like mud or sand, they can be very useful too. |
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6th Mar 2023 12:14am |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5038 
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Ive wondered about this, the rear locking diff is what £1500k from LR and there is a loom £500? and then the CCF file changes to say its fitted. Plus fitting, which is probably a pain What else is needed to get it to £6k Mike |
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6th Mar 2023 12:15pm |
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| lightning Member Since: 23 Apr 2009 Location: High Peak, Derbyshire Posts: 2841
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More useful than l thought! Too late for me though l doubt l will go far enough off road to need one.
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6th Mar 2023 6:04pm |
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| DSC-off Member Since: 16 Oct 2014 Location: North East Posts: 1428
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It's never too late... you know you want to.
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6th Mar 2023 6:18pm |
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| Mark1107 Member Since: 19 Oct 2020 Location: Los Angeles Posts: 74 
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Wrong. The rear locking differential in 2023 is about 2500 lbs, plus you have the core charge, plus the differential module is 700 lbs, plus you need to wire both to the rear cargo fusebox and the wire them to the BCM in the passenger footwell plus you need the larger half shaft which is 3-400 lbs plus you need to hire an automotive electrical engineer to install all of this as well. Oh yeah locking differential fluid is 80 lbs per quart. Plus CCF programming. Installation labor is in the range of 1500-3000 as well.
So its north of 6000 USD to add the locking differential. But you could try buying used parts but there arent many locking differentials on ebay. Also there are two different differentials depending on engine size and drive train. Now compare all of that mate to Ralfs Sarek simple solution. I'm the only person in the world who added the locking differential OEM parts to a P400 2020 Defender. Nobody else has done it. 2022 Defender Trek Competition 110 collectors edition! 2020 Defender 110 P400 Full Explorer Pack 7 Seater HSE Fuji White(sold) 2020 SVO Range Rover L405 Full Size Spectral Blue Chromaflair 2014 Range Rover L405 Autobiography Full Size Aintree Green 2014 Dodge Viper GTS Stryker Green |
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7th Mar 2023 5:48pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5038
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Im not disputing the additional parts i hadnt thought about larger half shafts and a car module - i assumed it used the main one.
Wiring is a few looms it would sound rather than one i identified. I suppose thats just a ball ache though But i did, until recently, have full access to parts and the diff in the UK wasnt that much £. CCF programming - well actually its only enabling, is easy there are a few people in the UK that can do it Ive changed a few diffs so thats not a big deal Mike |
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8th Mar 2023 7:59am |
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| XplusYplusZ Member Since: 16 Aug 2021 Location: UK Posts: 489 |
Speaking with the LR Experience guys, they quietly told me they didn't need the rear locking diff. I guess since the electronic traction systems are so smart, you'll get through pretty much any obstacle* without it. It probably wouldn't be as calm and controllable, but it'll do the job.
(*Unless you're climbing cliff faces like the wrangler in the clip above!) |
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8th Mar 2023 11:54am |
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| Retroanaconda Member Since: 04 Jan 2012 Location: Scotland Posts: 2656 
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The thing I love about the diff is that it’s proactive. It can lock up progressively depending on the mode, and avoids tyres scrabbling for grip. The Terrain Response is incredibly good and responds very quickly, certainly better than older systems, but it’s still reactive and so it’s not as smooth a drive.
In summary if ordering new I would always spec it if you want to use the car off road, but if buying second hand it wouldn’t be a deal breaker. |
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8th Mar 2023 12:25pm |
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