Replacing my speedometer cable

Plymouth 65 said

No, the speedometer cable is held into the tail housing via a forked retainer. Just remove the bolt on the retainer and pull the cable from the tail housing. Be prepared for transmission fluid to pour out once removed! 65'

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Thats how you get it out? I tried pulling it after remvoing the retainer but it didnt budge i guess it just didnt move since it had alot of dirt and grime built up around the cable itself, what would you recommend doing to pull it out other than using brake cleaner to get all the gunk off?