Diff types
Posted: Thu Jul 23, 2009 2:53 pmHeres a diff guide:
To add to the list;
3.64:1 7.5" for the RWD Cosworth (with 108mm drive-flanges)
The Granada Cosworth 24v diff is the same as the 2WD Cosworth BUT with Sierra compatible 100mm drive flanges.
and the 4x4 Cosworth is the same as the 2.8/9 Sierra's 4x4's
and 2.0 DOHC 4x4 is 3.92:1 in a 7" diff
and some 2.0 RWD DOHC's are 3.91:1 in a 7.5" diff
and finally some 2.3 diesels have a 3.14:1 7" (very rare)
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Box 10 on the VIN plate is the axle code.
M=3.14 (7" or 7.5")
A=3.36 (7.5")
V=3.38 (7")
U=3.62 (7")
3=3.64 (7.5")
9=3.91 (7.5")
D=3.92 (7")
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Another way of knowing what diff you have is to look on the diff ID tag (little alloy tag bolted to the rear cover, top left hand side)
There will be some numbers/letters (look at the top row),
EG. 83BG MC 362
The 1st set (83BG) is the case type (7" or 7.5") as there quite a few codes its not worth looking, the esiest way to ID a 7" and 7.5" is to look at the top mounting. The 7" has one long bolt/nut and the 7.5" has 2 bolts.
Next is the middle code in this code its 'MC' which is an 'OPEN' type diff (NON-LSD) basically ANY diff with 2 or more "A" in the middle code will be an LSD e.g. "AA" or "ADA" any other letters without an "A" in the code IS an open diff.
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The following diff are LSD.
ALL 4x4 Sierra's and Granada's (2.8/9 and 2.0DOHC and Cosworth)
Most BUT not all 24v Cosworth Granada/Scorpio (upto approx 1994 are LSD, after that they are 'open' type because the Scorpio 24v had traction controll instead)
All RWD COsworth Sierra (3dr, Saff, RS500)
Then you might find an LSD fitted as an option to any Sierra or Granada, but unlikely.
To add to the list;
3.64:1 7.5" for the RWD Cosworth (with 108mm drive-flanges)
The Granada Cosworth 24v diff is the same as the 2WD Cosworth BUT with Sierra compatible 100mm drive flanges.
and the 4x4 Cosworth is the same as the 2.8/9 Sierra's 4x4's
and 2.0 DOHC 4x4 is 3.92:1 in a 7" diff
and some 2.0 RWD DOHC's are 3.91:1 in a 7.5" diff
and finally some 2.3 diesels have a 3.14:1 7" (very rare)
-------------------------------------------------------------------------------------
Box 10 on the VIN plate is the axle code.
M=3.14 (7" or 7.5")
A=3.36 (7.5")
V=3.38 (7")
U=3.62 (7")
3=3.64 (7.5")
9=3.91 (7.5")
D=3.92 (7")
-------------------------------------------------------------------------------------
Another way of knowing what diff you have is to look on the diff ID tag (little alloy tag bolted to the rear cover, top left hand side)
There will be some numbers/letters (look at the top row),
EG. 83BG MC 362
The 1st set (83BG) is the case type (7" or 7.5") as there quite a few codes its not worth looking, the esiest way to ID a 7" and 7.5" is to look at the top mounting. The 7" has one long bolt/nut and the 7.5" has 2 bolts.
Next is the middle code in this code its 'MC' which is an 'OPEN' type diff (NON-LSD) basically ANY diff with 2 or more "A" in the middle code will be an LSD e.g. "AA" or "ADA" any other letters without an "A" in the code IS an open diff.
-------------------------------------------------------------------------------------
The following diff are LSD.
ALL 4x4 Sierra's and Granada's (2.8/9 and 2.0DOHC and Cosworth)
Most BUT not all 24v Cosworth Granada/Scorpio (upto approx 1994 are LSD, after that they are 'open' type because the Scorpio 24v had traction controll instead)
All RWD COsworth Sierra (3dr, Saff, RS500)
Then you might find an LSD fitted as an option to any Sierra or Granada, but unlikely.