Ok folks I have a 55 Cadillac 331 hydra-matic combo im stuffing in a 56 Cadillac coupe. It's time to start filling up fluids. The fluid that came out of the tranny was clean but didn't look like dex/merc . Ive been having trouble scaring up info on what people are using. I posted on the hamb Cadillac cruiser page and one Cadillac brethren posted back that he is using b&m trick shift ( thank you). I saw one other post on the internet were a guy said dex/merc is fine to use . Can anyone confirm that? I dont know squat about trannies, thanks for any help.