owelly
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| posted on 25/6/12 at 05:45 PM |
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Another diff question. Sorry!
I know you'll all tell me to do a search but I'm chasing myself round the bend! I've read through dozens of threads and been here
sierra data but there's nothoing that quite matches what I'm looking
at!
I bought a XR4x4 diff a few years ago and have just built a de-dion to use it. When I bought it, I checked the little tab on the diff and although I
can't remember the letters and numbers, it had AA on it and according to the info I could find at the time, it was an LSD.
I accidentally poked a hole in the diff back cover the other week so I've taken it off to weld up. And to my horror, there's an open diff
looking back at me! I thought it seemed veru much like the open Atlas I'd just taken out!
Anyhoo, the figures on the crown wheel are as follows:
362 83BG 4210 SD
I thought it was 362 83B6 4210 SD but its hard to read.
Written in painty-pen on the crown wheel is: 1256 362
Thanks in advance chaps/chappesses.
[Edited on 25/6/12 by owelly]
http://www.ppcmag.co.uk
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jacko
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| posted on 25/6/12 at 05:58 PM |
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I have a lsd diff and it looks just like you say and from what i remember the nombers etc ar the same as yours
362-83bg
mine came out a 4x4 too
there is some info in my photo archives if you have a look
have you looked at the link below
Graham
http://www.locostbuilders.co.uk/forum/9/viewthread.php?tid=85080
[Edited on 25/6/12 by jacko]
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phelpsa
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| posted on 25/6/12 at 06:00 PM |
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It is a normal open differential with a viscous pack on the other side of the crownwheel. There's nothing fancy about the differential part of
it.
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mark chandler
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| posted on 25/6/12 at 06:13 PM |
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It does fool you, the bit that mounts the crown wheel is a bit fatter as the LSD half is contained within this, it works by binding the halfshaft to
the crownwheel on one side thereby locking the centre planet gears, simple but effective 
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owelly
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| posted on 25/6/12 at 06:14 PM |
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Cheers guys.
Jacko, I had a looksy at your archive stuff but could'nt find a match.
Phelpsa, what the heck is a viscous doofer doing on the crown wheel? Whats the idea of that?
And another thing: as I understand it, the 7" diff has one long bolt through the top mounting, like mine has, yet there seems to be 7 1/2"
diffs for sale that have the same bolt arrangement as mine. According to the 7th heaven data stuff, the 7 1/2" should have two bolts for the top
mount. I'm confused.com. Whats right?
http://www.ppcmag.co.uk
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jacko
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| posted on 25/6/12 at 06:21 PM |
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http://www.locostbuilders.co.uk/photos.php?action=showphoto&photo=7vs7.5diffs2.jpg
Jacko
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owelly
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| posted on 25/6/12 at 06:28 PM |
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Goodo. Mine is a 7" (fnarf fnarf) and those advertised as 7 1/2" are wrong. So as long as I get one with the single bolt top mount and
lobro shafts, and an LSD, I should be OK?
http://www.ppcmag.co.uk
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owelly
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| posted on 25/6/12 at 06:30 PM |
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Here's what I'm looking at..
http://www.ppcmag.co.uk
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jacko
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| posted on 25/6/12 at 06:34 PM |
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http://www.locostbuilders.co.uk/viewthread.php?tid=126868
this looks like mine
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owelly
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| posted on 25/6/12 at 06:38 PM |
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quote:
The sierra LSD is a viscious coupling type so it looks like an open diff but the back of the crown wheel and the carrier are thicker than on an open
diff to accomodate the viscious bit.
Muh? So Sierras didn't have a proper LSD? They just have a viscous pack on the crown wheel? Blimey, every day's a school day!
http://www.ppcmag.co.uk
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snapper
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| posted on 25/6/12 at 06:52 PM |
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One on the left is an LSD
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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owelly
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| posted on 25/6/12 at 06:59 PM |
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My brain hurts.......
So I DO have what FoMoCo call a LSD. Goodo, but it doesn't actually work like a LSD.....
http://www.ppcmag.co.uk
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jacko
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| posted on 25/6/12 at 07:34 PM |
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To baffle you more look at Google images put in
sierra lsd diff 
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mark chandler
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| posted on 25/6/12 at 09:38 PM |
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quote:
Originally posted by owelly
My brain hurts.......
So I DO have what FoMoCo call a LSD. Goodo, but it doesn't actually work like a LSD.....
Yes it does
Normal diff the half shafts locate in the planet gears, so to lock up you can weld the planet gears up so now the halfshafts are effectively tied to
the crown wheel.
All this is doing is locking 1 x halfshaft to the crown wheel, effectively the same thing.
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owelly
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| posted on 25/6/12 at 10:10 PM |
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But Shirley, that means that only one drive shaft has the limited slip and the other doesn't?
http://www.ppcmag.co.uk
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Chippy
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| posted on 25/6/12 at 10:35 PM |
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The diff that you have will work just like any other LSD, its just that Ford took a differing aproach to getting the same result. I had one fitted to
my V6 and it worked just fine, I now have a Quaffe one due to changing to a 3.14 diff with push in shafts, and that doesn't seem to work as
well. Cheers Ray
To make a car go faster, just add lightness. Colin Chapman - OR - fit a bigger engine. Chippy
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gunman
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| posted on 25/6/12 at 10:49 PM |
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I had the same moment of horror when I took the cover off my xr4x4 diff. It is an LSD from your pics. I have mine fitted now and it works great.
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mcerd1
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| posted on 26/6/12 at 07:44 AM |
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quote:
Originally posted by owelly
But Shirley, that means that only one drive shaft has the limited slip and the other doesn't?
no, the other shaft is effectively locked too…
forget the crown wheel for a moment, now you've just got the 4 small gears in a square which can all spin freely together - so if you then lock
one to the housing none of the rest can turn
takes a minute to get your head round it but trust me it works - I conducted several hours of 'testing' a sierra donor with a ford LSD
just to make sure 
I had the same moment of panic when I opened mine, but I also had an open diff at the same time - the only visible differnces I could find were the
lump in the middle of the crown wheel (as per snappers's pic) and the axle stubs are unequal lengths on the LSD
if your still not sure, hold the propshaft still and try turning the driveshafts in opposite directions - if its a working LSD it will be hard
work....
[Edited on 26/6/2012 by mcerd1]
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owelly
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| posted on 26/6/12 at 08:59 AM |
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PING! Got it! I've got my fuzzy little head round it now.
http://www.ppcmag.co.uk
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