 | 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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Yes, both props were balanced to eliminate them as the source.
Thanks Steve, all that you mention was also done. -- 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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2nd Nov 2018 6:36am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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After 3 months of systematic investigation by Elrico (one of the best indies in Cape Town), a new rear propshaft + new flanges has solved about 90% of the issue.
During this time, all the major drivetrain components have been swapped out and/or replaced with no difference: front diff, front propshaft, engine mountings, transfer box, rear propshaft, rear diff, A-frame ball joint, etc. Even though the original rear prop was showing true on the balancing machine (two separate ones showed it to be perfect), replacing it cured the vibration. The Puma now drives without any vibration, but there is a loud/low-frequency droning noise from about 40kmh up to around 110kmh, especially when you come off the accelerator. However, unlike the original vibration, it doesn't feel as if something is going to break while driving, so that's a definite improvement. What is still baffling to anyone who has worked on my Puma is that as soon as the rear propshaft is removed, the vehicle runs beautifully - no noise or vibration whatsoever. Yet, replacing the rear diff, halfshafts, etc., has no effect on the noise/vibration. Any further suggestions on how to resolve this droning noise would be much appreciated  --
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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28th Mar 2019 8:34am |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 616  
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I had similar problem after change of both diffs to Ashcroft lockers and used KAM 1:3,8 gears on Discovery 2. I was not able to set the right contact pattern on rear diff, I spent quite a long time testing different sets of spacers. Result was howling rear gears. When driving without rear prop shaft, it was quiet. I had to buy new rear gears, setup was just few minutes and result is perfect - no more howling. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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28th Mar 2019 9:40am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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Thanks MadTom
I'm not sure I understand what you mean by new rear gears - do you mean the gears inside the rear diff? But aren't those the Ashcroft ATB ones?  --
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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28th Mar 2019 9:44am |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 616
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No, no connection to Ashcroft ATB, but to the diff and howling. I was installing full lockers from Ashcroft together with slower diff gearing - those 2 big toothed gears. And the howling was problem of these two main gears (ring gear and pinion gear), no inside the locker (or ATB or any other diff centre).
The problem was, that with used gear set, I was not able to set their correct position - they were worn bad, and result was howling. With new gear set, setting the correct position was a piece of cake and result was no noise. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo |
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28th Mar 2019 10:04am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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Ah, I understand.
But in my case, we replaced the rear diff twice, with two different ones from vehicles running smoothly, and still the noise persists. When we put my diff in another vehicle, there is no noise  --
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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28th Mar 2019 10:10am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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thanks, is this oil fine then? SPIRO GEAR 85W140/500ML
-- 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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4th Jul 2019 8:17am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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Finally got the landy back after it spent 7 months in the shop.
Besides a thorough investigation into the root cause of the vibrations, the following were replaced: - rear propshaft - A-frame ball joint - rear springs (Terrafirma Heavy) - all bushes The landy now drives much better, although there's still a vibration at low speeds coming from the gearbox/transfer case area (bum area) and the rear diff howls at around 80kmh. Having been without an off-roadworthy landy since Feb 2018, I'm done trying to sort this out any further. I guess this is a Defender after all, so I shouldn't complain that it isn't safe, comfortable, etc., and just live with the issues.  --
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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4th Jul 2019 1:13pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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Happy to report that after 3 weeks of much-needed TLC at a new indie workshop, the vibration is now almost gone and the truck now drives lekker!
they did a complete respray of the chassis, fixed the rear diff vibration, new UJs on both props, new output shaft seal, tightened front left bearing, new rear side shafts & drive members, etc. -- 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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7th Oct 2019 1:54pm |
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| Bluericky Member Since: 26 Jun 2014 Location: Cornwall Posts: 647  
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Glad you got it all sorted , I’ve had similar problems and also replaced just about everything.
It turns out my front was bent ! Well done for persevering https://www.instagram.com/hustynminepark/ |
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7th Oct 2019 5:56pm |
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| CharlieDonuts Member Since: 16 Jun 2019 Location: Illiers Combray Posts: 133  
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I was planning to drive to ASHCROFT from where I live in France to have ATB differentials fitted front and rear.
With the quarantine on both sides of the channel thats impossible for me to do now. If I were to mail order the ATB differentials What level of competence is needed to fit them Can I do it myself ? do I need to find a mechanic ? does the mechanic have to be expert in differentials ? |
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23rd May 2020 1:28pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638
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You could DIY if you were a diff expert, so best to take it to a very experienced landy rover mechanic
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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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23rd May 2020 1:49pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17353 
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Were you planning on buying just the diffs and building them into your existing pinion housings, or buying built up units and just swapping the assemblies?
Either is fairly straightforward but the former is not for the faint-hearted and requires some special tools, the latter is an easy DIY job. |
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23rd May 2020 2:01pm |
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| CharlieDonuts Member Since: 16 Jun 2019 Location: Illiers Combray Posts: 133
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Easy DIY job meaning me and my mate and the workshop manual ?
How many people does it take to lift a differential. I was thinking about the delivery. Last edited by CharlieDonuts on 23rd May 2020 2:50pm. Edited 1 time in total |
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23rd May 2020 2:31pm |
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