Ricks-9r
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| posted on 17/12/07 at 12:32 PM |
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LSD or NOT lsd that is the question
how can i tell if i have a LSD fitted, apart from taking off the cover ? ,its a sierra diff with push in shafts ,it dont feel like a LSD diff as when
jacked up the wheel spins freely & not tight to turn like other lsd,s ive worked on (my Skyline GTR & mates WRX) any help appreciated 
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2b_pablo
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| posted on 17/12/07 at 12:43 PM |
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look at the ID plate. i think if there are 2 or more As in the middle part its an LSD.
or jack up and spin one wheel. the other should turn the same way.
someone posted a list of all the diff IDs in another thread.
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2b_pablo
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| posted on 17/12/07 at 12:44 PM |
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another way is to go to halfords car park and give it dixie on full lock 
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mookaloid
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| posted on 17/12/07 at 12:51 PM |
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If when jacked up the wheels spin freely then it is an open diff.
The LSD takes quite some effort to turn the wheels.
I thought my wheel bearings were binding when I first built the car until I realised how it works.
The thing where you turn the wheel and look for the other wheel turning one way or the other is a red herring as both open and LS diffs work in
exactly the same way.
Cheers
Mark
"That thing you're thinking - it wont be that."
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2b_pablo
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| posted on 17/12/07 at 12:54 PM |
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ah np.
the ID is the best bet then imo.
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mcerd1
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| posted on 17/12/07 at 01:24 PM |
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quote:
Originally posted by Ricks-9r
,its a sierra diff with push in shafts
I don't think there is a ford LSD with push-in shafts :? so its probibly an open diff, but the ID tag will help you work it out - see here:
http://forum.fordsierraclub.co.uk/viewtopic.php?t=5843&highlight=diffs
although it could have an aftermarket limited slip fitted (Quaife etc) the ID tag won't help with this, but its unlikley to have one 
if the wheels are easy to turn in opposite directions, then its an open diff (or a dead LSD)
[Edited on 17/12/07 by mcerd1]
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TimC
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| posted on 17/12/07 at 01:27 PM |
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quote:
Originally posted by mookaloid
If when jacked up the wheels spin freely then it is an open diff.
The LSD takes quite some effort to turn the wheels.
I thought my wheel bearings were binding when I first built the car until I realised how it works.
The thing where you turn the wheel and look for the other wheel turning one way or the other is a red herring as both open and LS diffs work in
exactly the same way.
Cheers
Mark
The best way if you don't have the ID tag is to try to turn the output flanges in the opposite direction to each other. If your 4-year old
nephew could do it, it's open. If it takes quite a bit of effort then it's LSD.
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Ricks-9r
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| posted on 17/12/07 at 02:10 PM |
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well according to this its not an LSD as it has push in shafts
Push in type shafts
KC 3.14 7"
LC 3.38 7"
MC 3.62 7"
JD 3.92 7"
DA 3.91 7.5"
Bolt on shafts
BA 3.14 7"
GB 3.14 7.5"
DAA 3.14 7.5" LSD
FA 3.36 7.5"
AAA 3.36 7.5" LSD
AC 3.38 7"
CAA 3.38 7" LSD
BC 3.62 7"
BAA 3.62 7" LSD
AAA 3.64 7.5" COSWORTH (this has the same number as the 3.36 7.5" LSD BUT is ID'ed by 108mm drive flanges)
ADA 3.64 7.5" GRANADA COSWORTH
DC 3.92 7"
AA 3.92 7" LSD
GA 3.91 7.5"
ABA 3.91 7.5" LSD
thanks for your help
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mcerd1
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| posted on 17/12/07 at 02:34 PM |
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quote:
Originally posted by Ricks-9r
well according to this its not an LSD as it has push in shafts
but on the plus side, push-in shafts are lighter
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madteg
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| posted on 17/12/07 at 05:53 PM |
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lsd
Any diff with two, AA in it is lsd , you cannot tell by rotation of driveshafts.
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Wadders
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| posted on 17/12/07 at 08:00 PM |
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I wouldn't worry too much if its not an LSD, the ford viscous LSD is set up for the much heavier doner sierra, pretty useless in a bec, i
ditched mine in favour of a quaife unit, expensive but it works. And as said push in shafts are lighter.
Al.
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