Diff Identification

[Gusty]

Hi all,

 

Tried google but no luck .This code is stamped on my diff any ideas? 83BG-ZD33-AE

 

Cheers

[MarkBzero]

Gusty,

I have a diff codes somewhere when I get back home.

[Gusty]

Cheers Mark and thanks once again for the carb Info.

 

Regards Andy

[tractor]

wot you want to know for if it just to find out wot ratio you have then you turn prop one full revolution and count how many times wheels go round I think or it could be turn wheel and count prop turns

3 1/2 roughly would be 3.62 and nearly four turns would be 3.92

Edited June 5, 2016 by tractor

[Gusty]

Hi,

 

Found the id tag it's a 3.38. Any good?

[Longboarder]

The information needed to identify a diff is on a thin alloy tag held by one of the rear cover securing bolts. It often breaks off or corrodes away. The number you have posted is the part number of the casting of the case or cover and doesn't tell you about the internals. So to identify either do the turns in and out method or take off the rear cover and you will find have written the ratio on the sun wheel in white paint.

 

Nigel

[Gusty]

The 338 is off the alloy tag. From the tag 83BG4006LC. 4A 338 2m2

 

Cheers

[Guest 2b cruising]

If it is 3.38 it is a good diff for either cruising or higher torque engines.

Not a lot of difference to the 3.62 but just a little.

[MarkBzero]

Hi Andy,

This is the information I have on diff codes, can't remember where i found it.

Diff Codes ( Ford Sierra Diff codes, Differential Codes, Diff Numbers, Sierra Diff )

Ford axle codes
A=3.36 B=3.77 D=3.92 F=3.842 J=4.056 K=3.31 M=3.14 N=4.29 P=3.58 J=3.62 V=3.33 Z=3.59 2=4.27 3=3.62 4=3.82 5=3.26 6=3.12 8=3.56

3,14 CW47-Pin15
3,38 CW44-Pin13
3,62 CW47-Pin13
3,92 CW51-Pin13
3,77 CW49-Pin13 6.5 inch diff

3,38 fitted to 1,6 OHC ECO 5 speed
3,38 fitted to 2,0 OHC HC
3,38 fitted to 2.3 v6 ESTATE
3,14 fitted to 1,6 OHC ECO 4 speed
3,14 fitted to 2.3 v6 SALOON
3.14 fitted to 2.3 Diesel

85GG 4006 DC --- 3.97
85GG 4006 BC --- 3.62
85GG 4006 AC --- 3.38
85GG 4006 FB --- 3.36
87BG 4006 GB --- 3.14

86GG 4006 AAA --- 3.92 LSD
V87BB 4006 BAA --- 3.62 LSD
V87BG 4006 CAA --- 3.38 LSD
85GG 4006 AAA --- 3.36 LSD

Vin plate codes for Diff ratio

Ratio Code
3.14 M
3.36 A
3.38 V
3.62 U
3.64 3
3.92 D

[Guest 2b cruising]

That's terrific info Mark.

Takes away any doubts and saves valuable time.

Just have to find somewhere to store it now and not forget where it is at the time of need.

[Gusty]

Thanks Mark, much appreciated.

 

Rgds Andy

[cb750]

Good info Mark, filed away for future reference!

[richyb66]

Bear in mind that Mark's list only shows SIerra diffs and that there's also Scorpio diffs available in both 7" and & 7.5" sizes that are in some cases interchangeable with the Sierra equivalents.

[brumster]

Just for completeness - it won't be yours - but there is a "rare" 6.5" diff, it was only available in 3.62:1 ratio I believe. Externally it looks the same as a 7" diff - it mounts the same - although if you measure across the driveshaft flanges it is actually different in width. It has a smaller CWP in it, smaller push-in shafts, and is generally considered weaker.... however the racer boys love it because it's something like a kilo or two lighter than the 7".

 

So just be aware - I put it here for reference really, in case anyone is buying a 3.62 diff, you might want to check/verify whether it's a 7" or 6.5".

[richyb66]

Will be checking my old diff tonight. It's a 3.62 but it's got the smaller 23 spline shafts not the 26 spline ones. No doubt if I confirm it's 6.5", it will coincide with a global crash in the value of 6.5" diffs on the open market.