 | Home > Technical > ATB (torsen) front and rear install |
 
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638   
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chaps, since the ATB has been in my Puma, there has been a groaning noise that's become quite bad.
My indie and I eventually traced it to the rear diff: at specific rpm/speed, there is a loud, low-frequency groaning noise + vibration emanating from the rear of the car. It almost feels as if the seats have built-in massage function, especially when I hit 80-100kmh. Has anyone else experienced this after fitting an Ashcroft, and if so, how did you fix this? thanks -- 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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1st Feb 2018 11:51am |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2149 
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No vibration, well anymore than usual in my 110 but I have got a noise which sounds like transmission wind up i havmt been able to trace yet
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1st Feb 2018 1:03pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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Just got an update from the workshop: they fitted a new crownwheel + pinion and the problem is gone, plus one of the bearings was not sitting properly (not too sure about the exact terms).
the original diff was replaced by LR after about a year of ownership, so not sure if that was not done properly, and after 9 years it finally went over when the ATB was installed? my indie says now that the droning noise from the diff is gone, there's a 'squeaky' noise that's appeared, and he thinks there's a bearing in the gearbox that needs inspecting  --
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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13th Feb 2018 2:08pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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gents, another update on this ongoing saga:
after the new crownwheel + pinion were fitted, the droning noise was still there, so the indie took out the ATB and fitted the original diff, and claimed the noise(s) were gone. Picked up the landy just after lunch and noticed that between 0-60kmh, there is a high-pitched whine coming from the rear, similar to the jet whine you can hear when a plan is about to land. Above 60kmh, the whine disappear, and once I get up to 80kmh+, there is still a loud droning noise + vibration coming from the rear. I'm now at a loss regarding this issue (and I'm pretty sure so is my indie), so any recommendations on how to tackle this issue will be much appreciated. thanks! -- 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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1st Mar 2018 2:46pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3640  
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Bummer hope you sort it soon DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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1st Mar 2018 6:09pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2149
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Had a little too much fun with my LSD today, blew a CV being a chav
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1st Mar 2018 7:49pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3640
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love the wheels DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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1st Mar 2018 8:10pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2413  
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Did you setup the diff by the book? It can be tricky if you do not follow the instructions. Torques on side bearings are critical (20Nm) and as well pinion depth/height and backlash.
Puma 110" SW ............................................................. Earth first. Other planets later |
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1st Mar 2018 9:47pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3640
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Visited Ashcroft's fitting centre yesterday and had my front ATB installed, first impressions are that on the main roads coming home there is next to no noticeable differences, except a very slightly improved inclination to return to centre under power and a slight pull to the left.
Will update when I get a chance to use it on a more slippy surface. I now have 2 spare original low mileage un-abused single pin diff centres both in excellent condition if anyone wants one for a diff rebuild please PM me DEFENDER 90 TDCI XS, I hope everyone is well and your land rovers make you happy Last edited by LR90XS2011 on 12th Mar 2022 7:26am. Edited 1 time in total |
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28th Mar 2018 5:53am |
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| BykerPete Member Since: 02 Feb 2015 Location: Midlands Posts: 159 
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I have front, centre and rear ATB’s from Ashcroft fitted on my Puma. (I spend a lot of time driving on ice and snow and I Do notice a difference since they were fitted.
One slight issue (when on dry roads without snow etc.) is that the steering seems to pull to the left on UK roads, and to the right when in mainland Europe. I’m wondering if the front one is somehow reacting to the camber in the road? Anyone else found this, or have any ideas about why this might be happening? Pete. |
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5th Apr 2018 10:26pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Hi Pete. Even with standard open diffs you get that pull to the left under braking on UK cambered roads. The ATB will accentuate this. How bad is it on a scale of "thats irritating to holy crap what the hell just happened"??
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6th Apr 2018 8:25am |
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| BykerPete Member Since: 02 Feb 2015 Location: Midlands Posts: 159
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Thanks - very useful info.
I would rate it as mildly annoying. The thing is, it is constantly there, not just when I apply the brakes. After a while my poor old hands start to get tired of applying slight pressure to the steering wheel to keep the thing in a straight line. I’ve checked tyre pressures and they’re fine. Pete. |
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6th Apr 2018 10:25am |
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| 100inch Member Since: 15 May 2012 Location: Brunswick Posts: 411  
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Fitted a front and rear Ashcroft unit earlier this year on my 110 with 255 tyres. Yes, I noticed a the slight pull but hardly notable. I wonder if the ATB's highlight other issues like tired shocks and bushes. m
Last edited by 100inch on 7th Apr 2018 8:53am. Edited 1 time in total |
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7th Apr 2018 12:05am |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3640
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Took mine to work and back yesterday which is a few B roads and driving through Solihull to Tyseley, dry roads and sunny day
I was looking for differences so probably drove a bit more spiritedly. When pulling out of junctions fast (defender fast) with some lock on the steering the self centre action is definitely more than it was before. For some reason I also feel more confident in the corners, its like the car responds to steering input sooner its not a massive change but I feel its there. Other than that I can feel no difference to how it felt pre install, certainly not tracking due to camber any more than normal, in fact I was expecting to feel more difference, I do however have a pull to the left when I let go of the wheel Will update on the wet road/grass performance as soon as I'm out on a wet day, which is rare as mine tends to spend its life in the garage or out on Sunny sundays DEFENDER 90 TDCI XS, I hope everyone is well and your land rovers make you happy Last edited by LR90XS2011 on 12th Mar 2022 7:25am. Edited 1 time in total |
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7th Apr 2018 5:37am |
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