IIRC, the number should be on the right side of the case, somewhere
around the bottom.
TRANSMISSION CODES
AA 1200 4.375 from chassis No 0 981 810
AB 1300 4.375 Up to 8/70
AC 1500 4.125 Also some 1300 from 8/70
AD 1200 4.375 Limited Slip Differential (LSD)
AE 1300 4.375 Limited Slip Differential (LSD)
AF 1500 4.125 LSD up to 8/70; also some 1300 from 8/70
AG 1200 4.375 Type 147 (Fridolin)
AH 1500 4.125 IRS suspension from 8/68
AH 1600 4.125 8/69-8/72
AK 1500 3.875 Type 181 Trekker up to 8/70
AK 1600 3.875 Type 181 Trekker from 8/70
AL 1500 3.875 Type 181 with LSD to 8/70
AL 1600 3.875 Type 181 with LSD from 8/70
AM 1300 4.375 Saloon and Cabrio from 8/70
AN 1600 3.875 Karmann Ghia IRS from 8/70
AO 1600 3.875 Karmann Ghia from 8/70
AP 1300 4.375 LSD from 8/70
AQ 1600 4.125 LSD 8/70-8/72
AR 1600 3.875 K-Ghia LSD from 8/70
AS 1600 3.875 Type 1 from 8/72
AT 1600 3.875 1303S and Cabrio from 8/72
AU 1600 3.875 Ditto with LSD
BA 1300 4.375 Semi-auto from 8/68-8/70
BA 1500 4.375 Semi-auto from 8/68-8/70
BC 1300 4.375 Ditto with LSD
BC 1500 4.375 Ditto with LSD
BE 1600 4.125 Semi-auto from 8/70-8/71
BF 1600 4.125 Ditto with LSD
BG 1300 4.125 K-Ghia semi-auto from 8/70
BH 1300 4.125 Ditto with LSD
BJ 1300 4.375 Semi-auto from 8/70
BK 1300 4.375 Ditto with LSD
DA 1500 4.125 Type 3 swing-axle to 8/68*
DA 1600 4.125 Type 3 swing-axle to 8/68*
DB 1500 4.125 Ditto with LSD*
DB 1600 4.125 Ditto with LSD*
DC 1500 4.125 Type 3 with IRS from 8/68
DC 1600 4.125 Type 3 with IRS from 8/68
DD 1500 4.125 Ditto with LSD
DD 1600 4.125 Ditto with LSD
*Note that reinforced swing-axle design was available on
post 8/68 Type 3 models as an option (M263)