 | Home > Technical > Different Diff ratios front to rear |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382   
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I have been running this set-up (ATBs F&R, HD R&P front only) for the last 150,000 miles with no consequential problems. The difference is insignificant in the overall scheme of things.
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17th Oct 2016 12:17pm |
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| roel Member Since: 08 Aug 2009 Location: Lelystad Posts: 2039  
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Did you count the teeth? Is there a real difference? 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 Oct 2016 3:50pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2227 
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I agree with Roel,
I don't see how the 0.04:1 ratio difference could be possible with a the small number of teeth. I highly doubt that standard puma and late TD5 110s leave the factory with different ratio differentials. Steve 02' 110 TD5 Double Cab Rebuild Thread |
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17th Oct 2016 4:16pm |
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| sabartnoc Member Since: 28 Aug 2016 Location: Landes Posts: 4  
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on the front it is the HD ashcroft 3.5:1 which is 28 teeth on crown wheel and 8 on the pinion,
on the rear it is the standard 3.54:1 is 46 teeth on the crown wheel and 13 on the pinion. |
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17th Oct 2016 4:51pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382
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Yes, there is a difference.
No, it does not matter. |
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17th Oct 2016 6:42pm |
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| LR90XS2011 Member Since: 05 Apr 2011 Location: bickenhill Posts: 3641 
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dosnt matter until you lock the centre diff, with the centre diff locked you will get transmission wind up more quickly not much of an issue on loose surfaces but might be on tarmac DEFENDER 90 TDCI XS,
I hope everyone is well and your land rovers make you happy |
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17th Oct 2016 8:59pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382
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No, it doesn't matter when you lock the centre diff, because (unless you are stupid) you only do this on loose surfaces.
I have run exactly this combination for over 150,000 miles, it does not cause problems and works very well. Be aware that you may well get a pronounced whine from the HD R&P on the overrun until the diff is fully 'run in'. The HD R&P sets from Ashtrans are aimed primarily at competition vehicles where noise isn't a problem, rather than road vehicle. Mine is now silent, but whined for a few thousand miles. |
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18th Oct 2016 10:31am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8029  
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ashcroft low pinion rear as an option? Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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18th Oct 2016 7:47pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17382
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That's a good option but is pricey since it is a custom diff and you need a new propshaft too.
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18th Oct 2016 9:02pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8029
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you can just shorten the existing rear prop, thats what i did Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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21st Oct 2016 6:36pm |
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| foxyred Member Since: 16 Jul 2016 Location: Nottingham Posts: 227  
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Think Range rover 4.8 uses the same diff as Puma 110
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21st Oct 2016 8:41pm |
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