Following the introduction of Hydramatic in 1941, it remained an extra-cost option and manual transmissions were standard equipment. Nonetheless, the data I have seen show the percentage of Cadillacs with a manual transmission declined until 1949, the last year manual transmission were standard on all Cadillac models, when only 3.5% of Cadillacs were sold with a manual transmission. In 1953, the last post-war year a manual transmission was available, it was standard equipment on hearses/ambulances and Series 75 limousines, while Hydramatic was standard equipment on all other passenger car models. According to data gathered by the late Matt Larsen, in '53 only 19 passenger cars and about 1,000 hearses and ambulances had a manual transmission. Beginning in '54 Hydramatic was standard equipment on all Cadillacs until the introduction of the Cimarron and the CTS.