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| Zed Member Since: 07 Oct 2017 Location: In the woods Posts: 3322   
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“Labouring” was the reason I was given but I don’t know exactly, which is why I found the OP’s solution so interesting.
This is from Winchester’s website, both owners I spoke with had fitted uprated gearboxes with transit 6th gear purchased from them: “ Depending on your wheel size or transfer box ratio you might benefit from fitting the 0.77 lower ratio transit 6th Gear. Fitting the lower ratio can put you in a more comfortable rev range. labouring in 6th is a common cause of mainshaft wear. Here are a few examples. Standard 6th gear at 70mph 30inch tyres 2496 RPM Standard 6th gear at 70mph 32inch tyres 2340 RPM Transit 6th gear at 70mph 30inch tyres 2614 RPM Transit 6th gear at 70mph 32inch tyres 2428 RPM” https://www.winchestergears.com/performanc...4270-p.asp Are they mistaken? WARNING. This post may contain sarcasm. |
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8th Nov 2024 8:45pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17454 
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Allowing any engine to labour is bad, but I rather fail to see how running a shaft faster reduces wear. I suggest that in the absence of scientific evidence people should make up their own minds.
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8th Nov 2024 9:09pm |
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| 34064 Member Since: 12 Dec 2023 Location: South Central Posts: 194 
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Is it not the fact the shaft is moving faster but the increase in RPM pushes it further up than where peak torque is produced 110 Td5 Ex Utilities slowly converting into a pop top camper one day
Build thread:https://www.defender2.net/forum/post1024784.html#1024784 |
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8th Nov 2024 9:41pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8068  
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I can see the benefit of the transit 6th gear option. Higher revs for those on std tyres std tune towing heavy loads on long motorway journeys.
Or those running larger tyres and std tune. Although it's not something I have ever considered to increase revs as its only top gear. When I needed more oomph I fitted a 1.3t box. When I wanted more relaxed causing on a torque engine light vehicle I went 1.003. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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9th Nov 2024 5:49pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3429  
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Believe that it has to do with the cyclic loads. If need to maintain the same speed so power on the engine, when using a taller gear, the cylinder pressures need to be higher at lower engine RPM, and the flywheel and clutch plate springs are not able to fully absorb these cyclic loads. I think same reason the diff pins tend to elongate their respective hole. That's how I understand it, stand to be corrected though. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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9th Nov 2024 7:25pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2645  
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Speed limit is 120 km/h, and by then I'm at 2500 rpm. But there's more power in reserve, and I can't access it without everything shaking itself to death  --
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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11th Nov 2024 8:49am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2645
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How's that for service from Ashcroft? Placed the order on Thursday afternoon, and it arrived at my house on Monday morning
With the extended sump, what quantity of oil does the transfer box take now? -- 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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12th Nov 2024 12:49pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2427  
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+0.5 liter. Some say 0.6 liter. So just at level (and not more) of the filler hole. Puma 110" SW
............................................................. Earth first. Other planets later |
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12th Nov 2024 12:57pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8068
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that is great service, let us know how you get on with it. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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12th Nov 2024 2:41pm |
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| MK Member Since: 28 Aug 2008 Location: Santiago Posts: 2427
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I suggest you tap the sump as its lower point seats lower than the std drain hole. And if you install it dry, it is likely you will need a bit more than 3 l of oil. Puma 110" SW ............................................................. Earth first. Other planets later |
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14th Nov 2024 6:08pm |
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