Porsche 1972 911 Workshop Manual page 293

The following transmission versions are installed from 1974 models on:
S standard equipment
=
These transmission versions differ from those used in 1973 models only in the aspect of gear ratios (see
Technical Data, page 0.2
T Y P E 9 1 5 T R A N S M I S S I O N ( 1 9 7 4 M O D E L )
4-speed transmission, 915/16
5-speed transmission, 915/06
-
1/11).
T r a n s m i s s i o n
S
SW special order