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Ashcroft LT230 ATB Diff


4.5 average, based on 11 reviews

Product Information

We are very pleased to offer an automatic torque biasing centre differential for the LT230T.

A little background on the LT230 centre diff.  The centre diff is there to allow the props to turn at different speeds when cornering to stop drivetrain wind up. The speed difference is quite small and the centre diff gears are only designed to cope with these low speeds. If you are Off Road on snow or ice and you get wheelspin from one front wheel, what will happen is the rear prop will not be moving, the front will thus be going double speed, this means the small centre diff gears will be spinning like fury and after a matter of only a few seconds the planet gears will friction weld to the cross pins and the gears will fail etc. Of course in this situation the centre diff should be locked to avoid failure.

There are instances when it's not convenient to keep the diff locked or to constantly lock and unlock the diff as the available traction dictates, i.e,  when racing fast on a low traction surface, the vehicle will not handle well when locked but is likely to wheel spin when unlocked. 

Another example of where the ATB would help would be when rapidly changing from high to low traction surfaces,  i.e. when driving on snow or ice,

In both of these examples the ATB will limit the amount the difference in propshaft speed and transfer torque to the axle with traction.

The two big advantages are increased traction when unlocked and eliminating the weakness of the stock unlocked centre diff.

Note the ATB centre can still be locked like the stock unit when required, locking the diff is still advised when prolonged wheel spin is anticipated.

Please note : We are also able to supply a fitting kit which includes additional parts you may require, click here

When an ATB is ordered to be built within a rebuilt LT230 the price will be reduced to £ 300.

We make 2 different types of these as there are 2 different diameters of spline used for the high/low selector hub, the one you need can be identified by either the serial number or vehicle type,

Type A - RRC, Disco 1, all Defender pre TD5, Serial numbers starting 20D, 22D, 25D, 26D, 28D, 29D, 36D   


Type B - Disco 2, TD5 and TDCi Defenders, Serial numbers starting 41D, 42D, 43D, 57D, 60D, 61D, 62D, 68D, 69D, 70D, 80D, 81D


Note : Due to the nature of the ATB diff we do not recommend the vehicle is brake tested on rollers, ask for a decelerometer to be used instead.



Product Code: LT230ATB

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Customer Reviews

1 2 >3 [View All] Average Rating: 4.5

ATB Diff when Braking

I don't see any mention of the benefit when braking. I run it on a 2 door RR. It is great for pulling in loose sand or mud but also improves braking particularly giving confidence when descending at high angles on loose surfaces with no ABS.

Trevor Kent :: Mar 02 2020, 10:45 AM


Had the ATB in for some years now. I have a very tricked td5 defender with around 200hp at the flywheel. Have towed a 23 ft caravan for 12000km. I find it amazing on gravel roads at silly speeds-when the rear let's go drive transfers to the front axle and stabilizes the vehicle. Overall safety factor has increased a lot and there have been 0 problems. I do run increased oil capacity and use Castrol Syntrax 80/140 fully synthetic oil as the standard oil viscosity is not adequate for our hot weather in oz with extended towing and heavy work.

David Mills :: Jan 28 2020, 01:47 AM

Every LR should have one

This is the second one that I've fitted - LR should have fitted these as standard. I now have zero backlash in my MY13 90 - its a pleasure to drive and I now feel connected to the road again. Works a treat on gravel roads out in Australia. Thanks Dave! Top bit of kit.

James :: Oct 04 2018, 02:38 AM


RRC 200 TDi I just replaced the BW with the LTA230 28D whit ATB...that was what was needed!!! absolute perfection at the wheel. practically indispensable especially for those who have BW.never again no problem. Molto bene!!! finalmente una Range degna di tal nome. GRAZIE!

danilo :: Jun 24 2018, 17:10 PM

Excellent service

Ordered on a Monday and delivered to my door in Australia on the following Friday. Will be installing on the next service along with the MT-82 wet output shaft. The improvement will be well worth it.

George Steel :: Nov 03 2017, 05:21 AM

central ATB in Defender PumA 90

Installed the central ATB after parts of the rover spider gear thrust washers turned up in the oil along with excessive driveline play. The Ashcroft central ATB has eliminated the excessive driveline play/backlash, we now have much smoother gear changes with the MT82 box, improved on road handling, quieter running, improved off road traction. In short the install has totally transformed the vehicle, every Defender should have one

Hamish Wells :: Sep 29 2017, 20:37 PM

Great upgrade

I just finished installing the ashcroft mt82 output shaft and centre diff ATB. Wow what a difference! I have e-lockers both front and rear and to say that my vehicle has no clunking whats so ever is a understatement. The car feels amazing, the ATB just makes the drive feel planted and the car almost unstoppable. Great mod! The only issue i have is at very low rpm in a second it shunts a little bit making a strange noise but quickly disappears as the revs pick up. I don't know if this is a result of the ATB itself or whats going on. It doesn't really concern me but it wasn't doing this before the ATB. Anyway love this mod and highly recommend it.

Fernando :: May 28 2017, 08:47 AM

Great for dirt roads

To protect the center differential I used to drive with diff lock on dirt roads. With the diff lock the rear of my truck tended to drift a bit. After installing an Ashcroft LT230 ATB Type b all the drama went away and the D90 is a bit more civilized on dirt and wet roads. This is an upgrade that I have enjoyed a lot.

Otto :: May 05 2016, 21:35 PM

LT230 ATB Diff

I use this diff on my racer with the engine in the back. Before fitting the ATB the car had a tendency of having under steer due to too much drive torque going to the front axle. The under steer could only be avoided by locking the centre diff. With the ATB diff the handling issues are gone and the car drives so much better.

Joost :: Mar 02 2016, 16:35 PM

atb center diff

Have now had that on my 200tdi Disco for two years. Original center diff was ruined due to having young heart and legacy of Finnish rally driving combined to icy and snowy roads for 4-5months per year. With Ashcrofts atb-center diff it's getting harder to do an good wheel spin. On serious note I really appreciate this product. It is one of those things that should have been there from the factory. It has made Disco to feel like 4 wheeldrive. Regards Lari

Lari Tajakka :: Nov 02 2015, 21:23 PM

LT230 ATB centerdiff

This thing is just brilliant, especially on those semi-slippery roads and fields. No fuss, just traction. I had this installed on my 1987 Ninety together with an Ashcroft ATB diff in the rear axle - I only regret not having it done earlier. Provides more grip in wet roads conditions.

Philip Muller :: Jul 10 2014, 09:17 AM

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