thinking about rebuilding my rear diff and use the 3.5 Heavy duty crown wheel and pinion from Ashcroft. My question is will it work ok with my from 3.54 standard front diff? eventually i will also rebuild the front one but as it will cost around 1000eur each (including a locker) i was hoping to be able to take a break before spending another 1000eur
Disco 2 3.5 vs 3.54 diff ratios
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sierrafery
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might not be an issue as long as the central diff is not locked but i'm just guessing cos these kind of pure mechanical/ratio things are a bit beyond my skills, maybe some more mechanically minded member will enlight you/us, watching this with interest
to be honest i already sent them an email (waiting for a response) but i did want another (unbiased) opinion
i will probably just fit an air locker for now as its a simple change and will reinforce the diff by A LOT (Their biggest weakness is the chocolate single pin center which is currently rattling a little bit when the wheels are in the air, so something is probably coming loose)
300bhp/ton
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Rangieman123
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If Ashcrofts are advertising their new CWP's as 3.5 I reckon that's a fact. If they were actually 3.54's they would be advertised as such.
Mismatching front and rear diffs even at a this 1.1% difference would probably munch your centre diff.
Mismatching front and rear diffs even at a this 1.1% difference would probably munch your centre diff.
300bhp/ton
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eh? That is from the Ashcroft site... did you read it?
As for the difference, what do you think happens when you are going round a corner on the road?
Correct, i just found the faq section:
There will be a ratio difference but it is quite small, with the centre diff locked on a low traction surface this will be OK as occasionally one wheel may slip to stop the driveline ‘winding up’. When on road with the centre diff unlocked, the centre diff will turn slowly to allow for the ratio difference, this slow turning will not wear the diff excessively. The only instance where this ratio difference could cause a problem would be if you were on the road or on a high traction surface with the centre diff locked which of course you should not be.
There will be a ratio difference but it is quite small, with the centre diff locked on a low traction surface this will be OK as occasionally one wheel may slip to stop the driveline ‘winding up’. When on road with the centre diff unlocked, the centre diff will turn slowly to allow for the ratio difference, this slow turning will not wear the diff excessively. The only instance where this ratio difference could cause a problem would be if you were on the road or on a high traction surface with the centre diff locked which of course you should not be.
300bhp/ton
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If you are rock crawling and have diff lockers it could be an issue too, as that is often a high traction surface, but one where you would want 4wd. Not much in the way of rocks in the UK, so not really an issue here and any rocks we do have are slick and often wet & slippery.
I'm only down the road from Ashcroft, the local terrain here is chalk, clay and sand mostly. You'd have to drive many hours to get to any sort of rocky outcrop. So most off roading locally is generally on lose or slippery surfaces.
On a serious note if i planned on doing any significant rock crawling i wouldnt be interested in the stock 3.54 ratio anyway but would be looking at something a lot lower
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