andrew-theasby
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| posted on 3/8/06 at 06:15 PM |
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diff identification
Hi, im a bit puzzled, ive been offered a diff, which im told is a ford sierra 7.5 inch diff 3.91 ratio non LSD. Ive cross referenced the code on the
casing with a guide that was on here a week or so back (the code is 91BG AA 391,BOTTOM LINE READS 4A 1F27 5 015) and according to that it is a 3.92
7" LSD which is what im looking for. Can anybody please confirm any of these as im unable to check it physically. Thanks
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andrew-theasby
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| posted on 3/8/06 at 06:28 PM |
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Oh and i forgot to mention it has bolt on half shafts if that helps to identify it.
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JoelP
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| posted on 3/8/06 at 06:49 PM |
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best bet is to manually test it, by trying to turn the outputs seperately. I too thought that the AA bit meant it was LSD.
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givemethebighammer
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| posted on 3/8/06 at 07:07 PM |
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3.91 non LSD from 2.0 DOHC NON ABS MT75 TRANSMISSION
AA = non LSD
AAA = LSD (three characters with more than 2 A's, i.e BAA, ADA etc)
by my records,
but like Joel says test it to see.
[Edited on 3/8/06 by givemethebighammer]
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givemethebighammer
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| posted on 3/8/06 at 07:11 PM |
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spreadsheet of codes attached
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jacko
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| posted on 3/8/06 at 07:17 PM |
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Hi Andrew long time how you doing with the car Graham
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ASH3
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| posted on 3/8/06 at 07:57 PM |
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To be really sure wip the back
plate off ratio is stamped on the crownwheel.
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meany
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| posted on 3/8/06 at 08:59 PM |
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any help?
http://fordsierraclub.co.uk/forum/viewtopic.php?p=100105
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Liam
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| posted on 4/8/06 at 04:18 PM |
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Here's a 7 vs a 7.5. 7 on the left and 7.5 on the right. Note this particular 7 doesn't have bolt on driveshaft flanges but could just as
easily have them...
 
Rescued attachment 7vs7.5diffs2.jpg
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Liam
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| posted on 4/8/06 at 04:21 PM |
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Now 7.5 on the left and 7 on the right...
 
Rescued attachment 7vs7.5diffs.jpg
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andrew-theasby
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| posted on 4/8/06 at 11:05 PM |
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Hi, thanks for all the info guys, i can see now the 7 1/2" is much bigger, i foolishly expected it would only be 1/2"  Are the 3.9
(ish) LSDs quite rare? How much should i really be looking to pay if i find one and also, do all the bolt on drive shafts fit (different diameter)?
or are there some which wont
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