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  1. mumbaipete

    E24 Automatic Transmission

    Hello. I have a 1989 635csi Highline and I'm having problems with the automatic transmission. When I'm driving at a constant speed (40, 50 even 80) the car drops out of top gear runs for a time in the lower gear then violently goes back into top for a short while before dropping down again. I've taken it to a BMW service centre to try and have the diagnostic computer read but they couldn't do it. Has anyone else had a similar problem or any idea what might be causing mine? All help gratefully received! Cheers.