tony-devon
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| posted on 21/1/12 at 11:29 PM |
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sierra 4x4 front diffs
Greetings all, as the supply of rear diffs and parts gradually dries up in my area in particular, I have noticed that theres a good number of front
diffs available on ebay
now for my trike builds where the diff is exposed and often size is at a premium, they seem ideal, they look a bit better, and are smaller
so what am I missing??
are they fundamentally weaker? hows the power split in a 4x4 sierra?
this is mainly for a new trike build for my wife, will be small bike powerplant, probably only a 500-750 engine, and therefore not a lot more than
65-70bhp.
I cant believe that nobody has used one in a trike for no good reason, however I cant find that reason
1 thing I dont know about is if the front and rear driveshafts on a sierra rotate the same way under the car, or if they contra rotate?
trying to get my head round it, I have to run sierra diffs upside down dueto my bike driveshafts running opposite direction to car ones.
anyone offer any advice or know a reason why I shouldnt use one
thanks
heavy is good, heavy is reliable, and if it breaks, hit them with it
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snapper
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| posted on 22/1/12 at 06:54 AM |
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Well you wouldn't have to run it upside down in a rear application for one.
It will take over 200bhp as standard.
There are strengning plates available.
It's not LSD.
One side mounting.
Cheap so give it a go
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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big_wasa
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| posted on 22/1/12 at 08:20 AM |
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I think they are ideal as a chain drive diff. They must be strong as they are worth nothing. I couldnt sell one five years ago.
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tony-devon
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| posted on 22/1/12 at 09:07 AM |
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quote:
Originally posted by snapper
Well you wouldn't have to run it upside down in a rear application for one.
It will take over 200bhp as standard.
There are strengning plates available.
It's not LSD.
One side mounting.
Cheap so give it a go
many thanks
running it RWU is a bonus
I got nothing like that amount of power planned
if by strenthening plates, you mean the mounts, then thats not a problem?
not LSD, well you dont want that on a trike anyway
the 1 side mounting is a bit of a pain, might have to look further into that
found this
COSWORTH DIFF PLATE 4X4 4WD SIERRA ESCORT RS | eBay
am I rightto assume that they are all push in fitting for the shafts? are the fronts different fitment to the rears?
[Edited on 22/1/12 by tony-devon]
[Edited on 22/1/12 by tony-devon]
heavy is good, heavy is reliable, and if it breaks, hit them with it
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JoelP
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| posted on 22/1/12 at 11:01 PM |
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would it wear out faster than expected with it running in reverse, or would low mileage, weight, power and cost make this not a problem?
Beware! Bourettes is binfectious.
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tony-devon
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| posted on 30/1/12 at 04:44 PM |
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I dont actually know, I have run sierra rear diffs upside down for many years
never had huge amounts of BHP going through the, 100-110bhp is about it, never had any problems.
Im now looking elsewhere anyway as Im not overly keenon the way that the diffs mount.
having trouble finding a setup with hubs that look easyish to mount, ie like the sierra setup
heavy is good, heavy is reliable, and if it breaks, hit them with it
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Liam
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| posted on 30/1/12 at 11:06 PM |
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The 4x4 front diff is the same 'layout' as the rear diff - i.e. if you're looking at the input flange the crownwheel is on the
right. So if your engine is such that you have to mount your usual choice of a sierra rear diff up-side-down, then you'll have to mount a front
diff up-side-down too. The plus side is it will be running in its intended direction, although as you say, I doubt you've ever had any problems
running rear diffs backwards in such a light duty application. The main difficulty you'll have is that only the OS side has a driveshaft just
slot in. The NS is usually up against the sierra sump and an intermediate shaft that runs through the sump plugs in. However this is apparently quite
easy to sort - the Dax Rush quadra plugs driveshafts in both sides and I was told by an owner all that needs doing is machining the oil seal out
enough that the driveshaft fits in properly. I never saw what is done but it sounded a simple task. Then of course you'll have to extend both
driveshafts. If you can be bothered with all this you have a compact and light (about half a rear diff) diff to use, but is it worth it? What about
other alternatives - a freelander rear diff is a popular light/compact alternative to the sierra rear diff, for example.
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