Lurch88
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| posted on 3/6/13 at 07:24 PM |
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Diff ID please
HI
I have a Sierra Diff in my garage which I always assumed was a 3.62 but after researching the code I think it might be a 3.92 just want to be accurate
when I list it .
Could someone check the codes for me please and confirm it
Ta
Its a
83 BG 4006 JD
A 392 8E30
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Ben_Copeland
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| posted on 3/6/13 at 07:31 PM |
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3.92 it's in the code. 392
Ben
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marco
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| posted on 3/6/13 at 09:30 PM |
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Push in shafts 3.92 7" non lsd possible....
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Hopley89
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| posted on 3/6/13 at 10:41 PM |
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hi mate i had the same prob as the code tag is the easyest thing to rust ..
i opened up the diff and on the big main cog there will be the ratio stamped in it some were its kinda small but all sierra diff have got them ... i
found out mines a 3.14
hopley89
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Hopley89
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| posted on 3/6/13 at 10:42 PM |
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hi mate i had the same prob as the code tag is the easyest thing to rust ..
i opened up the diff and on the big main cog there will be the ratio stamped in it some were its kinda small but all sierra diff have got them ... i
found out mines a 3.14
hopley89
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fregis
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| posted on 4/6/13 at 08:03 AM |
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ratio were written in the first line end
Never be afraid to do what you are insolvent, remember: amateurs built the ark - Professionals built the Titanic.
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loggyboy
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| posted on 4/6/13 at 08:09 AM |
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If you have driveshafts or stubaxles handy you could put them in, turn them and count the number of turns the input shaft does. Saves removing all the
back plate.
Mistral Motorsport
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mcerd1
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| posted on 4/6/13 at 12:24 PM |
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the tag with the code can be hard to read due to the rust and is easy swapped from one diff to another 
so unless you sure its not been messed about with I'd always double check by taking the back cover of - that way you'll know for sure what
ratio it is and if its an open diff or LSD
its only a few bolts and a bit of instant gasket and some new oil 
(I'm assuming you'd drain the oil for postage anyway or change it before fitting to a car)
heres one I did earlier:
-
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Lurch88
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| posted on 4/6/13 at 12:29 PM |
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Thanks for that guys
Im fairly sure its a 3.92 open diff
Which is enough information,with some photos
Ebay next !
Ta 
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ceebmoj
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| posted on 4/6/13 at 10:26 PM |
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I took this tonight 6# 3777 3.62
 
Description
Is it an LSD? It does not spin freely like an open diff however I would have expected more slip.
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