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Thanks for the suggestions. Will let you now what I eventually find out.

Thanks Franke Hello, Specialist, not so special, not knowing about your ZF transmission, Some suggestions: ..Low on fluid?? ...sport mode selector switch?, Spilled a beverage lately? unplug and go for a test drive, ..Plug-in by tranny?..loose connection? Maybe! ..Valve for 4th. might be stuck,?.. re...

I've got a 1989 635csi Highline auto. I'm having an issue with the transmission. When I'm driving at a constant speed (40, 50 ,60, 80 whatever) it drops out of 4th into 3rd then takes ages to jump back up but then falls out again quite quickly. Trying to get it sorted with an automatic transmission ...

Thanks Ron. Will take a look.

Thanks, I've only got 5 highlines on the database and the earliest is #430. So there's at least 95 highlines. The latest non highline I have so far is #420 so there's no more than 104 highlines. The rumour is 101 or 2 highlines and hopefully I'll eventually find out. This would be a lot easier if I...