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Ashcroft LT230 ATB Diff


5.0 average, based on 10 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   

- Please note that we are currently out of stock of the A type ATB until around mid May.  You can still fit the type B with an alternative hub.  In the interim period the 'A' type can still be ordered but will be charged at an additional £20 and you will be supplied with the B type and a hub.

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] View All Average Rating: 5

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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