 | Home > Technical > Is ATB differential dangerous? |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17491   
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Why a full locker in the front, not an ATB?
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16th Jan 2017 11:31pm |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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I googled atb diff.
 and it looks the same as a True-trac diff. I have a True trac in the front axle. You will hardly notice it on the road. If you are really sensitive you might feel that it wants to go easier to the straight ahead position when you floor the throttle.
I noticed this when I had it temporary replaced with a standard diff so I could rebuild the bearings off the diff. My 90 is lifted 7 cm so just below 3" without cranked steering arms etc. Without the True-trac it was more sensitive to changes in the road conditions. If you are not a hard core offroader an ATB in the front and rear axle might be a very good set-up. I have a Detroit Locker in the rear axle as I am more off-road biased. I don't have TC. But I understand that TC doesn't really like a Detroit locker. However ATB/Truetracs work very good together with TC. But coming back to my previous post any traction adding system ven TC, will make you slide sideways on a sideslope. Roel
1984 90 2.5 na Diesel - RR V8 (1994-2001) 1997 Camel Trophy Discovery 300TDI (2001-2009) 2005 G4 Discovery III 4.4 V8 (2008-2018) It's gone but it still hurts. 2003 90 Td5 (2009-now) |
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17th Jan 2017 8:42am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17491
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I have had front and rear Ashcroft ATBs fotted for over 100,000 miles. It doesn' t make any significant difference at all to the steering! |
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17th Jan 2017 10:49am |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260 
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wow
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17th Jan 2017 11:15am |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260
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Gents, I have much less concerns now about atbs and road performance. After all the atbs are for a while on the market and your experience cant be neglected. I think I will end up with 2 atbs - front and rear. Having TC on mine may help a lot.
Meanwhile I have just replaced the center diff with an atb from Ashcroft. |
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20th Jan 2017 9:10am |
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| ibexman Member Since: 13 Dec 2008 Location: Essex Posts: 2947
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i would like to hear comment on how atb centre behaves
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20th Jan 2017 9:37am |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260
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let me a week to make my mind.
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20th Jan 2017 10:05am |
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| JOW240725 Member Since: 04 May 2015 Location: Suffolk Posts: 7908 
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Hi diduan, bottom of pg. 4 onwards, may be of interest to you http://www.defender2.net/forum/topic46611-45.html
 James
MY2012 110 2.2TDCi XS SW Orkney Grey - http://www.defender2.net/forum/topic43410.html MY1990 110 200TDi SW beautifully faded Portofino Red - https://www.defender2.net/forum/post743641.html#743641 MY1984 90 V8 Slate Grey - https://www.defender2.net/forum/post744557.html#744557 Instagram @suffolk_rovers |
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20th Jan 2017 1:49pm |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260
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Thank you James, this just remembers me there is a lot work to be done.
Last edited by diduan on 3rd Feb 2017 10:00am. Edited 1 time in total |
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20th Jan 2017 2:24pm |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260
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The center atb diff from Ashcorft is a solid peace of engineering. I do not notice at all it is there during highway driving. First impressions on snow are very good. The car is very predictable and I dont have wheel spin at all. But it is too early to say now. I havent had the time to hit some side streets that are ice covered. |
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31st Jan 2017 7:18pm |
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| kevb Member Since: 03 Apr 2012 Location: AllPackedUp Posts: 34 |
Hi All,
On both my 90s I have an Ashcroft ATB in my front diff and Ashcroft pegged ARB air locker in the rear, on my main 90 I also have an Ashcroft ATB centre diff, this vehicle also has ETC/ABS (both are TD5s), The main 90 is set up for long range camping trips around Europe. its still on standard suspension, anti roll bars etc. The second 90 is a bit more off road set up with Gwyn Lewis/OME suspension, Gigglepin rear arms. Both have Cooper ST Max 285.75 all terrains. I am really happy with this set up, never noticed any negative effects and I love the ATBs as they just do their thing. If anything I noticed a slight tightening of the steering and a slight tendency to self centre when I first fitted them but now I don't notice, I would say this change was an improvement and in no way a negative. The centre diff ATB is excellent for fast dirt tracks where maybe having the diff locked would be a bit much, sometimes its nice to have both options  In the snow and slow muddy dirt tracks I find a huge improvement over standard, it easier to tread lightly and still get through. I find the ETC comes on less now and its got to be pretty bad for me to engage the rear locker
A big advantage is on sideslopes, if I have the rear locker in then it will slip but leaving it out and having the front with traction just seems to work better. In short, for me this is now my "go to" set up that I would do again and have not experienced any negatives (once I had paid for it  ) www.AllPackedUp.com |
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5th Feb 2017 10:47am |
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| gabe3105 Member Since: 25 May 2015 Location: Grimsby Posts: 237
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This may be a silly question, but I am a bit of a mechanical dunce....
The choice for front and rear seems to be ATB diff OR fully lockable. Given that you can get a centre ATB which you can also fully lock, why can't you have front and rear ATB's with full lock capabilities? |
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5th Feb 2017 11:04am |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260
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there is sth from KAM - lsd with friction plates (no torsen) and e-locker in one.
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5th Feb 2017 6:05pm |
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| Lodelaner Member Since: 04 Feb 2010 Location: Lambourn Posts: 633 
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I've had ATB on front on an 50th - hated it, removed it. The power on/off run out/tuck in was too much to live with and dangerous in an emergency situation. On a wet roundabout with a diesel spill I nearly crashed it.So the ATB was removed - problem gone.
The rear ATB was on the 50th and I also had it on a V8 Ninety. This was effective and un noticeable. Its subtle on a low powered diesel, and less noticeable on a 110 - but in an emergency and on low traction surfaces too intrusive and counterproductive when you need them most. JB @Lodelaner Instagram Youtube greenlaning and other LR related content |
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10th Feb 2017 10:17pm |
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