Table schema:
CREATE TABLE table_11497980_1 (gcm__kg__technical_capacity VARCHAR, transmission_make_type_speed VARCHAR)

Question: When the transmission make/type/speed is eaton fs 5306-a manual synchromesh 6 speed, what is the value of the gcm (kg) technical capacity?
SQL: SELECT gcm__kg__technical_capacity FROM table_11497980_1 WHERE transmission_make_type_speed = "Eaton FS 5306-A Manual Synchromesh 6 Speed"